Posts Tagged ‘diuretic’

Generic Name
colchicine (KOLE-chih-sene)
Type of Drug Antigout medication.
Prescribed For
Prevention and treatment of gouty arthritis; also prescribed for Mediterranean fever; chronic progressive multiple sclerosis; cirrhosis of the liver; biliary cirrhosis; Beh~et’s disease’, pseudogout (a condition caused by calcium deposits); amyloidosis; very low blood-platelet count (also known as ITP); skin reactions, including scleroderma, psoriasis, Sweet Syndrome, and other conditions; and nerve disability associated with chronic progressive multiple sclerosis.
General Information
While no one knows exactly how colchicine works, it appears to help people with gout by reducing the inflammatory response to uric acid crystals that form inside joints and by interfering with the body’s mechanism for making uric acid. Unlike drugs that affect uric acid levels, colchicine does not block the progression of gout to chronic gouty arthritis; it will, however, relieve the pain of acute attacks and lessen the frequency and severity of attacks. It has no effect on other kinds of pain.
Cautions and Warnings
Do not use colchicine if you are allergic or sensitive to any of its ingredients or you suffer from any serious blood, kidney, liver, stomach, or cardiac condition.
Vomiting, abdominal pain, diarrhea, nausea, kidney damage, and blood in the urine may occur with colchicine, especially at maximum doses. This can worsen existing gastrointestinal (GI) or other conditions. Stop taking the medication and call your doctor if you develop one of these symptoms.
She weakness that people develop while taking colchicine is frequently related to high levels of colchicine in the blood caused by poor kidney function and improves without treatment 3-4 weeks after the drug is stopped. This reaction is often mistaken for other conditions.
Periodic blood counts should be done if you are taking
colchicine for long periods of time.
Colchicine interferes with the absorption of vitamin B12 by af-
fecting the lining of the GI tract.
Colchicine may affect the process of sperm generation in men. The safety and effectiveness for use by children have not been
established.
Possible Side Effects
V Common: vomiting, diarrhea, and abdominal pain may occur if you take maximum doses of colchicine for an acute gout attack. You may also experience severe diarrhea, kidney and blood-vessel damage, blood in the urine, and reduced urination.
✓    Less common: hair loss, rash, appetite loss, and muscle and nerve weakness.
✓    Rare: with long-term colchicine therapy—reduced whiteblood-cell and platelet counts, nerve inflammation, blood-clotting problems, rash, unusual bleeding or bruising, tingling in the hands or feet, red or purple spots under the skin, and other reactions. Colchicine may interfere with sperm formation. Contact your doctor if you experience any side effect not listed above.
Drug Interactions
•    Colchicine interferes with the absorption of vitamin B12.
•    Colchicine may increase sensitivity to central-nervoussystem depressants, such as sedatives and alcohol.
•    The following drugs may reduce colchicine’s effectiveness: anticancer drugs, bumetanide, diazoxide, thiazide diuretics, ethacrynic acid, furosemide, mecamylamine, pyrazinamide, and triamterene.
•    Taking phenylbutazone with colchicine increases the risk of side effects.
•    Mixing the anitiiofic clarithromycin with colchicine can lead to colchicine toxicity, especially in the elderly and those with kidney disease.
Food Interactions None known.
Usual Dose
Acute Gout Attack: 1-1.2 mg. This dose may be followed by 0.51.2 mg every 1-2 hours until pain is relieved or nausea, vomiting, or diarrhea occurs. The total dose needed to control pain and in-
flammation during an attack varies from 4-8 mg.
Gout Prevention: 0.5-1.8 mg daily. In mild cases, 0.5 mg or 0.6 mg may be taken 3-4 days a week.
Familial Mediterranean Fever: 1-2 mg a day.
Cirrhosis of the Liver: 1 mg a day for 5 days each week. Biliary Cirrhosis: 0.6 mg twice a day.
Amyloidosis: 0.5 mg 1-2 times a day.
Behqet’s Disease: 0.5-1.5 mg a day.
Pseudogout: 0.6 mg twice a day.
ITP: 1.2-1.8 mg a day for 2 weeks or more.
Scleroderma: 1 mg a day.
Sweet Syndrome: 0.5 mg 1-3 times a day.
Other Skin Disorders: up to 1.8 mg a day, depending on the specific condition.
Overdosage
The lethal dose is estimated at 65 mg, although people have died after taking as little as 7 mg at once. Usually 1-3 days pass between the time that an overdose is taken and symptoms begin. Overdose symptoms start with nausea, vomiting, stomach pain, diarrhea—which may be severe and bloody—and burning sensations in the throat or stomach or on the skin. If you think you are experiencing overdose symptoms, contact your doctor immediately, or go to a hospital emergency room. ALWAYS bring the prescription bottle or container.
Special Information
Call your doctor if you develop rash, sore throat, fever, unusual bleeding or bruising, tiredness, weakness, numbness, or tingling. Seniors are move 4,ialy to develop drug side effects and should use this drug with caution.
Stop taking maximum doses of colchicine as soon as gout pain is relieved and reduce your dose to a maintenance level if your doctor has prescribed it for gout prevention. Stop taking the drug entirely and contact your doctor at the first sign of nausea, vomiting, stomach pain, or diarrhea.
If you forget a dose of colchicine, take it as soon as possible. If it is almost time for your next dose, skip the dose you forgot and continue with your regular schedule. Do not take a double dose.
Special Populations
Pregnancy/Breast-feeding: colchicine can harm the fetus. Pregnant women should not take it unless the potential benefits clearly outweigh the risks.
It is not known if colchicine passes into breast milk. No problems with nursing infants are known, but nursing mothers who must take colchicine should consider using infant formula.
Seniors: Seniors, especially those with renal, hepatic, gastrointestinal, or heart disease, are more likely to develop side effects and should use colchicine with caution.

Type of Drug
Contraceptives
Plan B
Prescribed For
Prevention of pregnancy, endometriosis, excessive menstruation, and cyclic withdrawal bleeding. Ortho Tri-Cyclen and Estrostep may be prescribed for moderate acne in women over age 15.
General Information
Contraceptive drugs are synthetic hormones containing either progestin or a progestin-estrogen combination. The overall effects of any contraceptive are influenced by the interaction of all active ingredients, including those Huth -&))Otogenic and anti-estrogenic aqtk%(kkj.’%tte drugs are similar to natural female hormones, which cannot be used as contraceptives because very large dosages would be required. Synthetic hormones are more potent and are effective at smaller dosages. Contraceptive drugs work by preventing sperm from reaching the unfertilized egg, preventing the implantation of a fertilized egg in the uterus, or preventing ovula-tion (the release of an unfertilized egg from the ovaries). They prevent acne by balancing hormone levels.
When properly used, hormonal contraceptives can be 97-99% effective at preventing pregnancy. These products vary in their etfectiveness, and in the amount and type of estrogen or progestin used. The side effects of these drugs tend to increase with the amount of hormone they contain. While low hormone dosages are preferred, contraceptives with the smallest amounts of estrogen may be less effective in some women than others.
Single-phase products provide constant levels of estrogen and progestin throughout the entire month-long pill cycle. In 2-phase combinations, the amount of estrogen remains at a steady low level throughout the cycle, while progestin levels increase and then decrease. This variation in progestin allows normal changes to take place in the uterus. Three-phase products are meant to simulate the normal hormone cycle and reduce breakthrough bleeding. Throughout the cycle, estrogen levels remain the same while those of progestin change to create a 3-part wave pattern. The amount of estrogen in 3-phase products is considered low. Breakthrough bleeding may occur with the older combination products from day 8 through 16 of the cycle.
The mini-pill, a progestin-only product, may cause irregular menstrual cycles and may be less effective than estrogenprogestin combinations. Mini-pills may be recommended to older women or women who should avoid estrogens (see “Cautions and Warnings”).
The contraceptive patch releases small amounts of progestin and estrogen continuously over 3 weeks. The medication is absorbed into the blood vessels just below the skin. The patch works in the same way as contraceptive pills do.
The vaginal ring releases small amounts of etonogestrel, a progestin, and estradiol, an estrogen, in the vaginal canal over 3 weeks. The combination prevents pregnancy in the same way as combination pills do but may be less effective than contraceptive pills because some people find them harder to use.
Most contraceptive drugs are designed to simulate a normal Mt%VwM cycle. By not taking the hormones 1 week out of the month, you continue to have your regular period. In fact, these products are often used to stabilize a woman’s period. Two products, Seasonale and Seasonique, come in an 84-pill packet and are taken once a day for 3 months. This means you will only have your period once every 3 months. Another, Lybrel. is designed to be taken every day, eliminating monthly menstruation. Drosperinone, the progestin found in Yasmin and Yaz, has been found to relieve Premenstrual Syndrome (PMS) symptoms in addition to acting as an effective contraceptive hormone.
Levonorgestrel, a progestin, is used in implants that provide effective contraception for up to 5 years after surgical implantation under the skin of the upper arm or inside the uterus. Levonorgestrel implants should be replaced at least once every 5 years. Etonorgestrel implants are effective for 3 years. Implants can be removed at any time, reversing the contraceptive effect. The progestin intrauterine inserts provide effective contraception for about 1 year. The implant and intrauterine systems contain the same hormone found in the mini-pill and are associated with many of the same side effects and precautions as oral contraceptives.
Emergency contraceptives (sometimes referred to as the “morning-after pill”) contain high doses of estrogen and progestin. They are intended for use only after contraceptive failure or unprotected intercourse. They should never be taken by a pregnant woman.
Contraceptive drugs in any form are associated with risks. These risks are greatest in women over age 35 who smoke and have high blood pressure.
Cautions and Warnings
Do not take contraceptives if you are allergic or sensitive to them or any of their ingredients.
The risk of breast cancer may be slightly higher among current and recent users of combination oral contraceptives. This risk appears to decline after contraceptive use is stopped and is gone by 10 years after stopping combination contraceptive products. Breast cancers found in contraceptive users tend to be less advanced than those in non-contraceptive users.
You should not use contraceptive drugs if you are or might be pregnant, have had blood clots in veins or arteries, stroke, any blood-coagulation disorder, known or suspected cancer 0 the breast, sex organs, or liver. Products With more estrogen, or those t43.t jmmdr3higher sustained blood levels of estrogen, such as the contraceptive patch, are more likely to be associated with an increased risk of life-threatening blood clots.
Contraceptive drugs may cause eye lesions. Call your doctor at once if you develop visual difficulties of any kind.
Women taking the combination products Seasonale and Seasonique will have their period only once every 3 months and those taking Lybrel will not have a regular monthly period. It is absolutely essential for you to verify you are not pregnant if you think you may be pregnant for any reason.
The risks of contraceptive drugs increase if you are physically immobile or have asthma; cardiac insufficiency; epilepsy; migraine; kidney problems; a strong family history of breast cancer; benign breast disease; diabetes; endometriosis; gallbladder disease or gallstones; liver problems, including jaundice; high blood cholesterol; high blood pressure; estrogen or progestin intolerance; depression; tuberculosis; or varicose veins.
There is an increased risk of heart attack in women who have used contraceptive drugs for more than 5 years, or who are between age 40 and 49 and have other coronary risk factors such as smoking. obesity, high blood pressure, diabetes, and high blood cholesterol. This risk remains even after the medication is stopped.
Smokers in their mid-30s or older who use contraceptive drugs are 5 times more likely to have a heart attack than nonsmokers taking contraceptives and 10-12 times more likely to have a heart attack than nonsmokers who do not use the pill. Death due to circulatory disease also increases substantially in smokers taking contraceptive drugs, especially in women at least 35 years old. The risk of stroke is also increased in this group. Heavy smokers (more than 15 cigarettes a day) should not use hormonal contraceptives.
Women with a history of headaches, high blood pressure, or varicose veins should avoid estrogen-containing products, as Should older women and those who have experienced estrogen side effects.
Contraceptive drugs may mask the onset of menopause. Progestin-only products are associated with an increased risk of blood-clotting problems.
The progestin in Yasmin and Yaz raises blood potassium levels. Women with kidney, liver,,Dy adrenal gland disease should use eittlp_C pIrjdUcj with caution.
Intrauterine inserts have been associated with an increased risk of pelvic inflammatory disease (PID). The highest risk usually occurs within the first 20 days after insertion. Do not use intrauterine inserts if you have had an ectopic pregnancy.
Toxic Shock Syndrome has been associated with tampons, some barrier contraceptives, and the vaginal ring, although there is no proof that the product was the cause of the infection.
Possible Side Effects
♦ Common: Common side effects often result from using a product that is poorly suited to your body chemistry. Determining the right amount and type of hormone often minimizes these effects. If you are taking too much estrogen, you may experience nausea, bloating, high blood pressure, migraine, excess cervical mucous, skin discoloration, colon polyps, water retention, and swelling, or breast fullness or tenderness. Too little estrogen may cause early or mid-cycle breakthrough bleeding, spotting, or reduced periodic flow. Too much progestin is associated with weight gain and increased appetite, tiredness or fatigue, low periodic flow, acne, depression, breast regression, and androgen-related side effects (acne, oily scalp, hair loss, or excess hair growth). Too little progestin may cause late breakthrough bleeding, excessive periodic bleeding, or missed periods.
✓    Less common: abdominal cramps, infertility after discontinuance of the drug, breast tenderness, weight change, headache, rash, vaginal itching and burning, general vaginal infection, nervousness, dizziness, depression, cataracts, changes in sex drive, hair loss, and increased sensitivity to the sun.
✓    Rare: Women who use contraceptive drugs are more likely to develop several serious conditions, including blood clots in the deep veins, stroke, heart attack, liver cancer, gallbladder disease, and high blood pressure. Women who smoke cigarettes are at much higher risk for some of these adverse effects. Contact your doctor if you experience any side effect not listed above.
brug Interactions
•    Ampicillin, barbiturates, bexarotene, bosentan, carbamazepine, chloramphenicol, efavirenz, fluconazole, griseofulvin, ketoconazole, neomycin, nelfinavir, nitrofuratoin, oxcarbazepine, phenylbutazone, phenytoin, penicillin drugs, protease inhibitor drugs for HIV, rifampin, rifapentine, statin drugs (atorvastatin and rosuvastatin), St. John’s wort, sulfa drugs, tetracycline products, and sedatives can make all contraceptive drugs less effective. Use backup birth control while taking these medications together.
•    Contraceptive drugs may elevate blood levels of benzodiazepine sedatives and sleeping pills (midazolam, lorazepam, oxazepam, and temazepam), caffeine, cyclosporine, imatinib, metoprolol, corticosteroids, theophylline drugs, tizanidine, triptan-type migraine drugs, and tricyclic antidepressants, increasing the risk of side effects. Discuss mixing these medicines with your doctor. Dosage reductions may be needed.
•    Contraceptive drugs may increase the toxic liver effects of acetaminophen and reduce the drug’s effectiveness. Contraceptive drugs may increase or decrease the effect of anticoagulant (blood-thinning) drugs. Discuss the risks of this combination with your doctor.
•    Mycophenolate interferes with only those contraceptives that contain levonorgestrel (Alesse, Aviane, Lessina. Levora, Levlite, Lutera, Lybrel, Mirena, Nordette, Norplant II, Portia, Plan B, Seasonale, Seasonique, and Triphasil). Backup contraception is recommended.
•    Exenatide may reduce the effectiveness of contraceptive pills.
Take them at least 1 hour before an injection of exenatide.
•    Contraceptive drugs may reduce the effectiveness of clofibrate for elevated blood triglycerides, sulfonylurea drugs for diabetes, ursodiol for gallbladder disease, and pain relievers, including salicylates (aspirin).
•    Contraceptive drugs may increase blood-cholesterol levels and interfere with blood tests for thyroid function and blood sugar.
•    Acetaminophen may increase blood levels of ethinyl estradiol, a common contraceptive drug ingredient, increasing side effects and reducing contraceptive effectiveness.
•    Since Yasmin and Yaz raise blood potassium levels, nether should be used if you ate taking spironolactone or anD)ftr potassium-sparing diuretic, potassium supplements, angiotensin-converting enzyme (ACE) inhibitors, angiotensin receptor antagonists, aldosterone antagonists, heparin, non-steroidal anti-inflammatory drugs (NSAIDs), or other medications on a long-term basis that may further increase potassium levels.
•    Contraceptive drugs may interfere with the effects of insulin
for diabetes.
•    Acitretin interferes with the contraceptive effect of progestin-
only mini-pills. It is not known if it also interferes with combination contraceptive drugs.
Food Interactions
None known. Usual Dose
Single-Phase, 2-Phase, and 3-Phase Combinations: The first day of bleeding is day 1 of the menstrual cycle. Beginning on the first day of the cycle, take 1 pill a day for 20-21 days according to the number of pills supplied by the manufacturer. If menstrual flow has not begun 7 days after taking the last pill, begin the next month’s cycle of pills. Some manufacturers recommend starting the pills on a Sunday to make it easy to remember to take them. In this case, start taking your pills on the first Sunday after your period begins. If menstruation begins on a Sunday, take the first pill that day.
Seasonale: Take 1 pink tablet every day for 84 consecutive days. Do not skip a day. Then, take 1 white pill a day for 7 days. Then, start a new pill cycle. You may be pregnant if you do not have a period while you are taking the white pills.
Seasonique: Take 1 light blue-green tablet containng levonorgestrel and ethinyl estradiol daily for 84 consecutive days, followed by 7 days of ethinyl estradiol tablets. Do not stop if spotting or breakthrough bleeding occurs. Report prolonged bleeding to your doctor.
Progestin-Only Mini-Pill: Take 1 pill every day.
Contraceptive Patch: Apply a new patch to the thigh, abdomen, or arm. Remove the patch after 3 weeks and then reapply a new patch after 1 week. Be sure to always apply a new patch on the same day of the week. If you are switching from birth control pmts, apply the first patch on the same day you would start a new cycle of pills.
Vaginal Ring: Keep the vaginal ring in the vaginal canal for 3 weeks. Remove it and put a new one in 1 week later. If you did not use a hormonal contraceptive in the previous month, insert the ring between day 1 and day 5 of your cycle.
If you are switching from a combination birth control pill, insert the ring anytime during the week after you took your last pill but before you would have started your next cycle of pills. No additional contraception is necessary.
If you are switching from a mini-pill, insert the ring on the day after you take your last mini-pill.
If you are switching from a progestin implant or an IUD, insert the ring on the same day your implant or IUD is removed.
If you are switching from a progestin injection, insert the ring on the same day you would have received your next injection.
If you are switching from a progestin-only mini-pill, implant, injection, or IUD, use another form of contraception for the first 7 days after you insert the ring.
Emergency Contraception: Emergency contraceptive kits have only a few pills. They should be taken with a full meal. Take half the pills (1 or 2 depending on the brand you use) within 72 hours of unprotected sex, however they are most effective when taken within the first 24 hours. Take the rest of the pills 12 hours after the first dose. Emergency contraceptives reduce the risk of pregnancy by 75%.
The pregnancy test in the kit can be used to determine if you became pregnant earlier in your cycle or during a previous cycle. If the test is positive, consult your doctor before taking emergency contraception. If you vomit within one hour of taking either dose, contact your doctor.
Overdosage
An overdose may cause nausea and withdrawal bleeding in adult women. Overdose victims should be taken to a hospital emergency room. ALWAYS bring the prescription package.
Special Information
Use backup birth control to prevent pregnancy in the first 3 weeks after you begin taking contraceptive drugs.
Contraceptive drugs do not protect against sexually transmitted diseases.
VM your pill at the same time each day to establish a routine and ensure maximum contraceptive protection.
Call your doctor immediately if you experience severe abdominal pain; severe or sudden headache; pain in the chest, groin, or leg, especially the calf; sudden slurring of speech; changes in vision; weakness, numbness, or pain in the arms or legs; coughing up of blood; loss of coordination; or shortness of breath. These symptoms may require emergency treatment.
Other problems that may require medical attention are bulging eyes; changes in vaginal bleeding; fainting; frequent or painful urination; a gradual increase in blood pressure; breast lumps or secretions; depression; yellowing of the skin or whites of the eyes; rash; redness or irritation; upper abdominal swelling, pain, or tenderness; an unusual or dark-colored mole; thick, white vaginal discharge; or vaginal itching or tenderness.
See your doctor for a check-up every 6-12 months.
Some manufacturers include 7 inert or iron pills in their packaging to be taken on days when the drug is not taken. This makes it easier for women to stay on schedule with their pills. The 7 pills bridge the gap between contraceptive cycles and allow women to take 1 pill every day without stopping.
For single- or 2-phase combinations: If you forget to take a pill for 1 day, take 2 pills the following day. If you miss 2 consecutive days, take 2 pills for the next 2 days. Then return to your schedule of 1 pill a day. If you miss 3 consecutive days, do not take any pills for the next 7 days and use another form of contraception; then start a brand new cycle.
Seasonale: The risk of pregnancy increases with each pink tablet you forget. Use another method of non-hormonal backup contraception any time you miss 2 or more pink tablets until you have taken a pink tablet every day for 7 consecutive days. You are protected against pregnancy if you miss 1 or more white tablets, as long as you begin taking the pink tablets again on the proper day.
Seasonique: The risk of ovulation and pregnancy increases with each forgotten light blue-green pill. If you miss 1 light blue-green pill, take it as soon as you remember and take the next pill at your regular time. This may mean you will take 2 pills on the same day. You don’t need to use a backup birth control method if you forget only 1 pill. If you forget 2 light blue-green pills in a row, take 2 pills on the day you remember and take 2 pills the ReYA day. -Then go back to taking 1 pill a day MMI you finish your pack. If you miss 2 01 MbreYight blue-green pills in a row, you must use non-hormonal backup contraception until you have taken a light blue-green pill daily for 7 days in a row. If you miss 1 or more yellow tablets, you are still protected against pregnancy provided you begin taking light blue-green pills again on the proper day.
For 3-phase combinations: If you forget to take a pill for 1 day, take 2 pills the following day. If you miss 2 consecutive days, take 2 pills for the next 2 days. Then return to your schedule of 1 pill a day. If you forget to take a pill for 3 days in a row, stop taking the drug and use an alternate means of contraception until your period starts. ALWAYS use a backup contraceptive method for the remainder of your cycle if you forget even 1 pill of a 3-phase combination.
If you forget to apply the contraceptive patch on the same day of the week once every 4 weeks, you risk a loss of effectiveness on the days after you should have applied it. If the patch comes off or is partially detached in mid-cycle, you must start a new 3-week cycle at once by removing the old patch and applying a new one.
If the vaginal ring is accidentally expelled during the 3 weeks it is normally retained, rinse it off with water and replace it within 3 hours. Do not use hot water. If the ring is not reusable, insert a new ring and continue with your regular schedule. If you do not replace the ring within 3 hours, its effectiveness may be reduced. If you are in week 3 of the cycle, throw the ring away; you may insert a new one immediately, which will begin a new 3-week cycle and cause you to skip a period. Or, you may wait a week, during which time you will have periodic bleeding, and insert a new ring no later than 7 days after the vaginal ring was expelled. This option should be chosen if you had used the ring for 7 days in a row before it was expelled.
If, when it is expelled, you are in week 1 or 2 of your cycle and the ring is out for more than 3 hours, reinsert it and use an additional form of contraceptive until the ring has been worn for 7 consecutive days. A vaginal ring may break and then slip out or cause discomfort. Throw the ring away if this happens.
Missing a pill reduces your protection. If you keep forgetting to take your pills, you must use another birth control method.
If you take drugs that reduce the effectiveness of contraceptive drugs (see “Drug Interactions”), use a backup contraceptive method during that cycle to PMNeiA accidental pregnancy.
GOOD tlL:Inlal hygiene is essential while taking contraceptive drugs. See your dentist regularly and brush and floss carefully because contraceptive drugs may increase the risk of an oral infection.
Contraceptive drugs may increase your sensitivity to the sun.
Wearing contact lenses may be uncomfortable while taking contraceptive drugs because the pills can cause minor changes in the shape of your eyes.
All contraceptive prescriptions come with a “patient package insert.” Read it thoroughly as it gives detailed information about the drug and is required by federal law.
Special Populations
PregnancylBreast-feeding., Contraceptive hormones cause birth defects and may interfere with fetal development. They are not safe for use during pregnancy. If you think you are pregnant, use another form of contraception and stop taking your birth control pills.
Contraceptive hormones pass into breast milk. Combination contraceptive products reduce the amount of milk produced. Nursing mothers who must use any of these drugs should use infant formula.
Seniors: These products are not intended for women who have completed menopause.

vasodilators Traditional vasodilators used in the prophylaxis and treatment of angina include glyceryl trinitrate and other nitrates. They have a general effect on the venous system but newer and more selectively acting antihypertensive drugs are the betaadrenoceptor blocking agents represented by propranolol, and the calcium channel blocking agents such as nifedipine. Other vasodilator drugs are the alpha-adrenoceptor blocking agents (indorarnin, prazosin) and the ACE inhibitors (captopril). Cerebral vasodilators are represented by isoxsuprine. Peripheral vasodilators include cinnarizine and thymoxamine. See pages 114 & 148.
vasopressin A preparation of the blood pressure- raising and antidiuretic factors of the pituitary gland. It has been used in doses of 5-20 units twice daily by s.c. or i.m. injection in diabetes insipidus, but has been largely superseded by demopressin. (Pilressin).
vecuronitim A non-depolarizing muscle relaxant of the rocuronium type. It has a medium duration of action, with the advantage of not causing histamine release. Dose: 80-100fLgjkg1min initially, with supplementary doses as required. (Norcuron).
venlafaxine An antidepressant that inhibits the re-uptake of both serotonin and nor-adrenaline.
Dose: in depressive illness, 75 mg daily, rising if necessary after some weeks to 150 ing daily, or exceptionally to 375 mg daily. Prolonged treatment is necessary for an adequate response and reduce potential relapse. Reduced doses are given in hepatic disease and lite elderly. Care is necessary in epilepsy, and before and after morloaniine oxidase inhibator (MAGI) therapy. Many side-effects have been noted, but any skin reaction should be reported to the prescriber. (Ffcxor). See page 128 and Table 11.
Dose: 120-480 mg daily according to the condition and degree of response. In severe arrhythinias, 5-10 mg i.v. under ECG control. Contraindicated in bradycardia, heart failure and heart block. Side-effects include nausea, hypotension and heart block. It should be used with caution in a patient already receiving a betaadrenoceptor blocking agent. (Cordilox; Securon). See page 148 and Table 21.
vigabatrin A new anti-epileptic drug. GABA (a gamma aminobutyric acid) is an inhibitor of neurotransmission, and epileptic seizures may be linked with a GABA deficiency. Vigabatrin has an inhibitory action on the GABAmetabolizing enzyme, and so indirectly permits a rise in the brain level of GABA. It is used in the treatment of epilepsy not responding to other anticonvulsants. Dose: 2 g daily initially, with adjustments up to 4 g daily together with current antiepileptic therapy. Side effects are numerous, and include drowsiness, fatigue, dizziness and weight gain. Sudden withdrawal is inadvisable. (Sabril). See page 136 and Table 15.
viloxazine An antidepressant with the general action, uses and side-effects of amitriptyline, but with a reduced sedative activity. It is given in depression associated with apathy, and in the depression of epilepsy.
Dose: 150-400 mg daily. It may increase the action of phenytoin and antihypertensive agents. (Vivalan). See page 128 an(] Table 11.
vinblastine An alkaloid of periwinkle that has cytotoxic properties. It is used in the control of acute leukaemias, lymphomas and other malignant conditions, and in mycosis fungoides.
Dose: 100 ltrjkg weekly i.v., increased by 50 pg/ki; weekly, up to 500 µg/kg weekly according to response. Side-effects include myclosuppress.ion, neurotoxicity and abdominal disturbances. The drug should be handled with care as it is a tissue irritant. (Velbe). See page 122 and Table 8.
105
verapamil A calcium channel blocking agent that reduces the movement ofcalciurn ions in cardiac tissues. It reduces the oxygen demand as well as the contractility of the myocardium, and it is used in angina, arrhythmias and hypertension.
vincristine A vinca alkaloid with the action and uses of vinblastine, but much less likely to cause myclodepression. It is used mainly in the treatment of acute
leukaemias in children, Hodgkin’s disease and other malignant lymphomas.

Neuromuscular side-effects may limit the dose. Other side-effects are abdominal disturbance and alopecia. The injection of the drug requires care as it is a tissue irritant. (Oncovin). See page 122 and Table 8.
vindesine A vinca alkaloid with an action similar to that of vincristine. It is used mainly in acute lyniphoblastic leukaemia in children, and in other malignant conditions not responding to treatment.
Dose: 3 nig/m` weekly by i.m. injection, subsequently increased up to 5 mg/in’ according to response. The side-effects are similar to those of other vinca alkaloids, but granulocytopenia may be a close-limiting factor. Extravasation should he avoided, as it may cause considerable local irritation. (Eldesine). See page 122 and fable R.
woo
vitamin D. Calciferol.
vitamin E The vitamin in the germ of wheat, rice and other grains. Deficiency States are uncommon, but may occur in cystic fibrosis and other conditions where fat absorption is impaired. It has been used empirically in many other
conditions, but its therapeutic value is questionable.
Dose: 5-15 ing daily. Now largely replaced by the synthetic form tocopherol.
vitamin K The vitamin concerned with the formation of prothrombin, and so with blood coagulation. Given as menadiol in haemorrhagic disorders, vitamin K, or phytomenadione has a similar but more rapid and sustained action. Of no value when the prothrombin level of the blood is adequate.
106
vinorelbine A cytostatic drug of the vinca alkaloid type. It is used in non-small cell lung cancer and in advanced breast cancer resistant to other drugs.
Dose: 25-36 ing/inweekly by i.v.
infusion. Main side-effect is neutropenia. (Navelbine). See page 122.
vitamin A One of the vitamins obtained from fish-liver oils. A deficiency in the diet causes night-blindness, skin changes and a decreased resistance to infection. Dose: 2500-25 000 units daily.
vitamin B A group of water soluble vitamins obtained from yeast or rice polishings. The constituents include thiamine, riboflavine, nicotinic acid, pyridoxine, and small amounts of other factors.
vitamin B. Pyridoxine.
vitamin B,, Cynacobalamin. vitamin C Ascorbic acid.
warfarin A synthetic anticoagulant similar to phenindione, but with reduced side-effects and it is now the preferred drug. It is used mainly in deep-vein thrombosis and transient brain ischaernia, in doses based on the prothrombin time as
reported by the laboratory in terms of the International Normalized Ratio (INR). Dose: Pending INR report, 10 ing daily initially for up to 3 days. Haemorrhage is the main side-effect, and may require the use of phytornenadione to control the excessive response.
Whitfield’s ointment Benzoic acid 6%, salicylic acid 3%. Has keratolytic and fungicidal properties, and is used mainly for ringworm.
wool alcohols A water-in-oil emulsifying agent obtained from wool fat. It is used in many water-containing ointments, such as ointment of wool alcohols and hydrous ointment.
vitamin D The vitamin essential for the absorption of calcium and phosphorus and subsequent bone formation. Several forms of the vitamin are known, but it is used chiefly as calciferol. Vitamin D is activated in the liver and kidneys to more powerful derivatives such as calcitriol and alfacalcidol.
wool fat A pale yellow, waxy substance, also known as lanolin, obtained from sheep’s wool. It consists mainly of cholesterol-derivatives, and is a constituent of various water-in-oil emulsifying and emollient ointment bases. It may cause skin sensitization in some susceptible patients.

xamoterol A partial 0, adrenoceptor agonist with a cardiac stimulant action. It is given only in mild chronic heart failure to control exercise-induced symptoms. Dose: 400 ing daily. Side-effects are dizziness, headache and gastrointestinal disturbances. Contraindicated in severe heart failure, and care is necessary in asthmatic conditions. (Corwin). See page 141 and Table 18.
xipamide A long-acting diuretic and anti-hypertensive similar to chlorthalidone. Dose: in hypertension, 20 ing is given as a morning close: in oedematous states, 40-90 mg as a single dose, reduced later as necessary. (Diurexan). See page 148 and Table 21.
xylometazoline A sympathomimetic agent used as a nasal decongestant, and to relieve allergic conjuncfivitis as drops of 0.05-0.1%. Rebound congestion may be a side-effect.
Z
zalcitabineV An antiviral agent used in the suppressive treatment of AIDS patients who have become resistant to or have failed to respond to zidovudine therapy. Dose: 2.25 nig daily under expert supervision, as the drug has many side-effects including
., peripheral neuropathy. 0 livid).
zidovudine An antiviral agent effective against the human immunodeficiency virus (HIV) associated with the acquired immune deficiency syndrome (AIDS). It inhibits the enzyme reverse transcriptase and, by preventing the formation of viral DNIA, it inhibits viral development. Dose: 33 ing/kg4-hourly for some months. Side-effects include anaemia, neutropenia, nausea, fever and malaise. Liver-function tests are necessary during treatment. The chronic use of analgesics such as paracetamol may increase the risk of neutropenia. (Retrovir). See page 144 and “table 19.
zinc oxide A soft white powder widely used in dusting powders, ointments, pastes, etc., for its mild astringent and antiseptic properties. It is a constituent of Lassar’s paste, Unna’s paste, Calamine Lotion and similar preparations.
zinc sulphate Used as an astringent and stimulating lotion (1%) for indolent ulcers; and in conjunctivitis as eye drops (0.25%).
zinc undecenoate A white insoluble powder. Constituent of dusting powders and ointments for mycolic conditions.
zolmitriptan A serotonin receptor agonist used only in the treatment of acute migraine.
Dose: 2.5 ing as soon as possible after onset. .A second dose may be given not less than 2 hours later if symptoms persist. Vornig). See page 154 and Table 23.
zolpidem A mild hypnotic that acts by binding with a sub-group of benzodiazepine receptors. It has a rapid action, and is used in the short-term treatment of insomnia.
Dose: 10 mg. Side-effects are dizziness and gastrointestinal disturbance. (SI ilnoct). See page 152 and Table 22.
zopiclone A mild hypnotic that binds with a sub-group of benzodiazepine receptors, and may modulate the neurotransmitter GABA.
Dose: in insomnia and early awakening, 7.. —]S mg with initial doses of 3.75 mg for the elderly. A side-effect is a bitter or metallic after-taste. (Zimovane). See page 152.
zuclopenthixol A powerful tranquillizing drug with actions, uses and side-effects similar to those of chlorpromazine. It is of value in schizophrenia with agitation and aggression.
Dose: 20-30 mg or more up to 150 mg daily. For depot maintenance treatment, 100-200 mg or more by deep i.m. injection at intervals of 2-3 weeks, according to need and response. (Clopixol). See page 168.

flumazenil A benzodiazepine antagonist used in anaesthesia to reverse the sedative effects of benzodiazepines.
Dose: 200µg initially by i.v. injection, with subsequent doses of 100 pg at I -minute intervals, up to a maximum of I mg. Further doses may be given by i.v. infusion if drowsiness returns, as the action of flumazenil is brief. ( Anexate).
flunisolide A potent corticosteroid used locally in the more severe forms of hay fever and other nasal allergies.
Dose: 1)), nasal inhalation, 50pg (2 sprays), 2 or 3 times a day, continued for 2-3 weeks, or longer if required. (Syntaris).
flunitrazepam A benzodiazepine with a hypnotic action used for the short-term treatment of insomnia.
Dose: 0.5-2 nig. Side-effects include drowsiness, ataxia and visual disturbances. (Rohypnol). See page 152 and Table 22.
fluocinolone A topically active potent corticosteroid. Used as cream, ointment or gel (0.00625-0.025%) in severe, inflamed, corticosteroid-responsive skin disorders. Excessive application should be avoided. (Synalar).
fluocino”ide A potent locally effective anti-inflammatory steroid similar to fluocinolone, used as cream, ointment or lotion (0.05%). (Metosyn).
fluocortolone A locally acting corticosteroid used as cream or ointment (0.25%) in severe, inflamed skin conditions. (Ultralanum).
fluorouracil A cytotoxic agent used in the palliative treatment of carcinoma of the breast and gastrointestinal tract and other solid tumours.
Dose: 15 ingft orally or by i.v. infusion weekly, up to a total dose of 12-25 g. Side-effects include alopecia and dermatitis, but haeniatotoxicity, severe gastrointestinal disturbance and haemorrhage may limit treatment. Fluorouracil is used locally as a 5% cream (Efudix) in malignant skin lesions.
fluoxetine An antidepressant that acts by selectively inhibiting the uptake of serotonin. Given in single daily doses of 20 mg. Dose: 60 mg daily are given in bulimia nervosa. Side-effects are gastrointestinal disturbances, dizziness and anorexia; rash is an indication of withdrawal. It should not be used with other drugs that influence serotonin uptake. (Prozac). See page 128 and Table 11.
flupenthixol A tranquillizer similar to fluphenazine and used in the treatment of schizophrenia with apathy and withdrawal. It also has an antidepressant action.
Dose: 6-18 ing daily initially, with subsequent adjustment according to need. It may cause some restlessness and insomnia. Dose by deep i.m. injection, 20-40 mg every 2-4 weeks. Dose in depression: 500 pg 31ngdaily.The side-effects are similar to those of chlorpromazine. (Depixol; Fluanoxol). See page 168 and Table 30.
fluphenazine An antipsychotic drug with the actions and uses of chlorpromazine, but with reduced sedative and anticholinergic side-effects, although extra-pyramidal symptoms may be increased. Dose: 2- 10 mg initially in schizophrenia adjusted up to 20 ing daily. In severe anxiety states 1-4 mg. For depot treatment, 12.5-100 ntg of the decanoate by deep i.m. injection every 12-14 days according to response. (Modecate; Moditen). See page 168 and Table 30.
fluorescein An orange-red dye; solutions have a strong green fluorescence. Used as eye drops (1-2%) for detecting corneal lesions, as areas of cornea denuded of epithelium stain green.
fluorometholone A corticosteroid used as eye drops (0.10%) for inflammatory conditions of the eye. (FML).
flurandrenolone A potent locally acting corticosteroid used as a cream or ointment (0.0125%) in severe skin disorders not responding to other therapy. (Haelan). An adhesive tape is used for small resistant dermatoses.
flurazepam A benzodiazepine hypnotic for
the short-term treatment of insomnia.

flurbiprofen A non-steroid anti-inflammatory drug with the actions, uses and side-effects of naproxen. It is used in the relief of pain and inflammation in rheumatoid and arthritic conditions, and in other
nitisculoskeletal disorders.
Dose: 150 mg daily, after food, increased tip to 300 mg daily if necessary. Suppositories of 100 nig are available. Care is necessary in peptic ulcer and in aspirin-sensitive asthmatic patients. (Froben). See page 165 and’I'able 29.
flutamide An androgen blocking agent that inhibits the action of androgens on target organs. It is used in advanced prostatic cancer not responding to other drugs, usually in association with goserelin or related agents.
Dose: 750 mg daily. Side-effects include gynacconiastia, and liver function should be checked. (Drogenil). See page 122 and Table 8.
folic acid A constituent of the vitamin B group. It is essential for cell division and the growth and development of normal red blood cells. The main therapeutic use is in the treatment of megaloblastic anaemias due to folic acid deficiency. Dose: 5 ing daily for 4 months initially;
ing weekly may be adequate after the haematological response has been obtained. Sometimes given with anti-epileptic drugs, as long-term therapy may cause a folic acid deficiency. Small doses are present in many iron preparations to prevent the inegaloblastic anaemia that may occur in later stages of pregnancy. It must not be used alone in pernicious anaemia, as it cannot prevent the degeneration of the central nervous system associated with that disease.
folinic acid A methotrexate antidote. It is given ai the end of a course of methotrexate to reduce the toxic effects on normal cells and in methotrexate-overdose. Dose: up to 120 mg over 24 hours by i.m. injection (or i.v.), with 60 mg orally for another 48-72 hours.
49
fluticasone A corticosteroid of increased potency. Used as a metered dose pump for the prophylaxis and treatment of seasonal allergic rhinitis and hay fever.
Dose: 100 pg (2 sprays) into each nostril mice a day in the morning. Maximum reliefmay not be obtained for 3-4 days. Systemic absorption extremely low. (Nixonaw.
fluvastatinV An inhibitor of the enzyme I I N46-CoA-reductase used in the treatment of hyperlipidaemia.
Dose: 20-40 ing daily in the evening. (Lescol). See page 146,’I'able 20 and atorvastatin, provastatin and ‘inivastatin.
fluvoxamine An antidepressant that acts by inhibiting the central re-uptake of serotonin. It is used mainly for maintenance treatment during depressive illness. Dose: 100-300 mg, daily in the evening; a steady plasma level is normally reached within 10-14 days. Side-effects after initial nausea may include somnolence, constipation and agitation. It should not be used with other drugs that increase scrotonin uptake, or with aminophylline or theophylline. (Faverin). See page 128 and Table 11.
follitropin A recombinant form of the follicle stimulating hormone used in some forms of infertility. It is given by injection in doses dependent on the degree of ovarian response. (Puregon).
formaldehyde A powerful but toxic germicide used mainly in the disinfection of rooms, and as’formalsaline’ (5% in normal saline) for the preservation of pathological specimens. Warts have been treated with a 3% solution.
formestane An inhibitor of aromatase, the enzyme that converts androgens to oestrogens. It is used in advanced postmenopausal breast cancer, as it has a cytotoxic action mediated by causing an oestrogen deficiency state.
Dose: 250 mg by deep intragluteal injection at intervals of 2 weeks, with variations of the injection site. Side-effect are rash, pruritus and occasional vaginal bleeding. Mentaron). See page 122 and Table 8.
foscarnet An antiviral agent for the treatment of sight-damaging cytomegalovirus retinitis in AIDS patients as an alternative to ganciclovir.
Dose: 60 mg/kg daily by i.v. infusion for 2-3 weeks, with subsequent infusion at a rate dependent on renal function. (Foscavir). See page 144 and,ribic ig.
fosfestrol A water-soluble derivative of stilboestrol. It is metabolized by the enzyme acid phosphatase to liberate stilboestrol in tissues rich in that enzyme, and so it is of value in prostatic carcinoma.
Dose: 1)), slow i.v. injection, 600-1200 rni, daily for 5 days or more. Oral maintenance dose: 120-360 nig daily. perinea) pain is a side-effect. (I lonvan). See page 122 and Table 8.
fosfomycin A phosphorus-containing antibiotic used mainly for infections of the lower urinary tract.
Dose: 3 g nightly after voiding the
bladder. Also used prophylactically before prostatectomy. Rash, nausea and diarrhoea are side-effects. (Monuril).
fosinopril An ACE inhibitor indicated in hypertension when standard therapy is ineffective or unsuitable.
Dose: 10 mg daily initially, adjusted after •1 weeks up to 40 nig according to need. It is eliminated by the liver as well as the kidneys, and may have some advantages in renal impairment. (Staril). See ACE inhibitors, page 148 and Table 21.
framycetin An antibiotic resembling neomycin in general properties. Used in eye infections as drops or ointment 0.5%. (Soframycin).
friar’s balsam Contains benzoin, storax, aloes, balsam of tolu. Official name Compound Tincture of Benzoin. See benzoin.
frusemide A loop diuretic with a powerful and intense action of short duration. Often effective in conditions no longer responding to thiazide diuretics.
Dose: 20-40 mg daily or on alternate days, or 20-50 mg i.ma or i.v. Much larger oral doses, varying front 250 nie, up to a single maximum dose of 2g may be required in renal failure and oliguria. Side-effects include nausea, diarrhoea and cramp. Masix). See page 141 and’Fable 18.
fusidic acid See sodium fusidate.
gabapentin An anticonvulsant used in the L11111101 of the partial seizures of epilepsy, although the mode of action is not yet clear. Dose: 300 mg initially, slowly increased to 1.2 g daily according to need. Drowsiness, tremor and weight gain are some side-effects. Withdrawal is with slowly reduced doses over 2-3 weeks. (Neurontin). See page 136 and Table I5.
gallamine A synthetic non-depolarizing (competitive) muscle relaxant.
Dose: 80-120 mg initially i.v. with small subsequent doses according to need and response. The action of the drug may be terminated by the injection of neostigmine, 2.5-5 mg, together with atropine, 0.5-1 mg. (Flaxedil). Now used less frequently as tachycardia is a side-effect.
gamolinic acid A derivative of linoleic acid present in evening primrose oil. It is said to be of value in atopic eczema.
Dose: 320-480 mg daily. It is also used in mastalgia (breast pain) in doses of
240-320 mg daily, but the response is slow (8-12 weeks). (Epogam; Ffarnast).
gammaglobulin See immunoglobulin.
ganciclovir An antiviral agent similar to aciclovir, but more toxic. It is used only in sight- and life- threatening infections with cytomegalovirus (CMV) in immunocompromised patients.
Dose: by i.v. infusion, 5 mg/kg every 12 hours for 14-21 days, with mainte nance (lose of 5 mg/kg daily. Later oral dose 3 g daily. The solution is very alkaline, and injection requires care. Regular blood counts are essential. (Cvnievene). See page 144 an(Frable 19.
G-CSF human urnan granulocyte colony stimulating factor. See filgrastim and lenograstim.
fusafungine An antibiotic with anti-inflammatory properties used for upper respiratory tract infections.
Dose: as aerosol spray 123 jig 5 boles  day. (Locabiotal).
Gee’s linctus A soothing cough linctus containing camphorated tincture of opium, oxymcl of squill and syrup of tolu.

clobazam A benzodiazepine tranquillizer with the actions and uses of diazepam, but with reduce(] sedative effects. It is used mainly in the short-term treatment of anxiety.
Dose: 20-30 mg as a single nightly dose. III severe anxiety larger but divided doses niav be given under medical control. It is also useful in the auxiliary treatment of epilepsy. (Frkiuni). See page [ 17 and'i'able.5.
clobetasol A potent corticosteroid used as a cream or ointment (0.05%) in the short-term treatment of severe inflammatory skin conditions not responding to less powerful drugs. The application should be used sparingly as absorption with systematic and local side-effects may occur with excessive or prolonged treatment. (Dermovate).
clobetasone A locally acting corticosteroid, used as a cream or ointment (0.05%) in eczema and inflammatory skin conditions not responding to less potent drugs. (Fumovate).
be withdrawn. Clofibrate may potentiate tile action of oral anticoagulants.
clomiphene An anti-oestrogen used to stimulate ovulation in some types of anovulatory sterility.
Dose: 50 mg daily for 5 days a month, repeated if ovulation does not occur, Its use has resulted in occasional multiple births. If pregnancy does not follow tip to 6 courses, further treatment is of little use. Side-effects are hot flushes, and abdominal discomfort; visual disturbances indicate that treatment should be withdrawn. Contraindicated in hepatic disease and ovarian neoplasm. (Cloinid; Scroplictic).
clomipramine A tricyclic antidepressant with the actions, uses and side-effects of inupramine and related drugs, but with reduced sedative properties.
Dose: 30-150 mg daily orally; up to
150 nog daily by im. injection. (Anafranil). See page 128 and Table 11.
clodronate sodium A bisphosphonate used like etidronate and pamidronate in the hypercalcaemia of malignancy.
Dose: 1.6-3.2 g daily as a single dose
I hour before or after food. May also be given i.v. by infusion as a single daily dose of 300 mg for 7-10 days. Long oral treatment is necessary, and serum calcium and phosphate levels should be checked. Side-effects are nausea and diarrhoea. (Hollefos; Loron).
clofazimine An antileprotic agent given in association with dapsone and rifampicin to prevent the incidence of resistance. Dose: 300 Ing monthly; in lepra reactions, 300 ing daily for 3 months. It may cause discoloration of the urine, skin and lesions. (Lunprcric).
clofibrate A plasma lipid-regulating agent used in hyperlipidaernia in conjunction with dietary measures, to reduce excessive plasma levels of cholesterol and
t riglycerides.
Dose: 2 g daily, with regular checks on plasma lipid levels. Side-effects are transient nausea and abdominal discomfort.
It increases the biliary excretion of cholesterol, and gall stones are a contraindication. A myosins-like reaction may occur in renal impairment, and the drug should
clonazepam A benzodiazepine with a marked anticonvulsant action of value in all types of epilepsy.
Dose: I mg daily initially, increased LIP to 8 nog daily according to need. fit status epilepticus, I mg by slow i.v. injection, but apnoea and hypotension, requiring prompt treatment, may occur. Side-effects include drowsiness, dizziness and irritability and occasionally, paradoxical aggression. (Rivotril). See page 136 and Table 15.
Clonidine A centrally acting antihypertensive pertensive agent, now used less frequently.
Dose: 150-300pg daily initially, increased it required up to 1.2 mg daily. Doses of 150-300 pg have been given by slow i.v. injection. Sudden withdrawal of the drug may provoke a I P
hy ertensive crisis.
(Catapres). Clonidine is also used in doses of 100 pg daily in the prophylaxis of migraine. (Dixarit). The side-effects include sedation, dry mouth, fluid retention and bradycardia. See pages 154 andTible 21.
clorazepate A benzodiazepine tranquillizer with the actions, uses and side-effects of diazepam. Used mainly in the short-term treatment of anxiety.
Dose: 7.5-22.5 mg daily, or it single dose of I  mg at night. (Tranxene). See page 117 and Table 5.

clotrimazole An antifungal agent used local]) in vaginal candidiasis.
Dose: 104-200 mg as vaginal tablets or pessaries for nightly insertion. Also used as a 1% cream, lotion or dusting powder for fungal infections of the skin and cars. Side-effecis are local irritation and erythema. (Canestall).
cloxacillin An acid-stable, semi-synthetic penicillin that is not broken down by the enzyme penicillinase, and so is effective in infections due to penicillin-resistant staphylococci.
Dose: 2 g daily before lbod. In severe infeL bons 250-500mg by injection 6-hourly. Now largely replaced by flucloxacillin. The side-coccus are those of the penicillins generally. (Orbenin).
antibacterial action, but when given with a penicillin the antibiotic is able to
penetrate into the cell without loss of
activity. The combination is of value in    33 infections due to penicillin-resistant penicillinase-producing bacteria, including most staphylococci.
Dose: as amoxycillin 750 mg daily, doubled in severe infections, or 3-4 g daily by slow i.v. injection. The side-effects, are similar to those of arnpicillin, but a posttreatment reaction is cholestatic jaundice. (Augmentin).
co-beneldopa tablets of levodopa and henzerazide. (Madopar). See levodopa.
cocaine A local anaesthetic. Still used occasionally in ophthalmology as a 2% solution, often with homatropine.
clozapine A potent but potentially toxic dopamine-receptor blocking agent used in schizophrenia resistant to other drugs.
Dose: 12.5-50 mg daily initially (with care -risk of hypotension), slowly increased to 300 mg daily according to need. A serious side-effect is neutropenia that may lead to agranulocytosis, and treatment must be
Linder hospital supervision with regular blood monitoring. Patient, doctor and hospital pharmacist must be registered with the Clozaril (clozapine) Patient
Monitoring Service to maintain the necessary strict control of treatment. (Clozaril).
coal tar Tile black viscous liquid obtained from the distillation ofcoal. It is used mainly as Zinc and Tar Paste in psoriasis and atophic eczema.
co-amilofruse tablets of the diuretics ainiloricle and frusemide. (Fruinil; Lasoride).
co-amilozide Tablets of the diuretics amiloride and hydrochlorothiazide. (Moduretic).
co-amoxicla A mixture of clavulinic acid and amoxycillin.The resistance to penicillin by staphylococci and other organisms is due to penicillinases such as beta-lactamase in the bacterial cell wall. Those enzymes inactivate penicillin before it call enter the cell and exert its antibacterial action. Such inactivation can be prevented by inhibitors of beta-lactamase such as clavidanic acid. That acid has no
co-careldopa Tablets of levodopa and carbidopa. (Sinemet). See levodopa.
co-codamol Tablets of codeine and paracetamol.
co-codaprin Tablets of codeine and aspirin.
co-darrthramer Tablets of danthron and poloxamer.
cod-liver oil A rich source of vitamins A and 1). It is used as a dietary supplement to improve general nutrition, promote calcification and prevent rickets.
Dose: 2-10 in[ daily.
codeine One of the alkaloids of opium. It depresses the cough centre and is used in the treatment of useless cough. It also reduces intestinal motility, and is useful in the symptomatic treatment of diarrhoea. It also has mild analgesic properties, and is present with aspirin in co-codaprin and similar preparations. In large doses the constipating action may be a disadvantage. Dose: 10 60 mg.
co-dergocrine A cerebral vasodilator, sometimes used in the treatment of senile dementia.
Dose: 1.5 mg daily, but the response is unreliable. Side-effects include nausea, rash and bradycardia. (Hydergine).
co-dydramol Tablets of dihydrocodeine and paracetamol.

chymotrypsin A proteolytic enzyme of the pancreas used in ophthalmology to facilitate intracapsular lens extraction. (Zonulysin).
cidofovir An antiviral agent used in cytomegalovirus retinitis resistant to ganciclivir.
Dose: 5 nig/kg by i.v. infusion every 2 weeks. (Vistide). See page 144 and ‘['able 19.
cilastatin See imipenem.
chlorthalidone A diuretic similar in action and uses to bendrofluazide, but with a longer duration of activity that permits a single morning dose. It is also useful in diabetes insipidus.
Dose: as diuretic 50-100 mg daily or on .illci nale days; in hypertension 25-50 mg; up to 350 mg daily in diabetes insipidus. (I lygrolon ). See page 148 and Table 21.
cholecalciferol See vitamin D.
cholestyramine An exchange resin that binds with bile acids in the intestines and prevents their absorption. Such acids are essential for cholesterol synthesis, and resin-binding leads indirectly to a lowering of plasma cholesterol levels.
Dose: in hyperlipidaemia: 12-24 g daily, wilh water; similar doses in the diarrhoea of Crohn's disease. It is also used in doses of 4-8 g daily to relieve the pruritus
associated with biliary obstruction. Side-effects are rash and gastrointestinal disturbances. Cholestyramine and related agents may interfere with the absorption of anticoagulants and other drugs. iQuestrari). See page 146 and Table 20.
choline theophyllinate A bronchodilator ,ilh the actions, uses and side-effects of anlinophyllille.
Dose: 400-1600 mg daily, after food. (C'I ioledyl). See page 118 and Table 6.
chorionic gonadotrophin A gonad-stimulating hormone prepared from the Urine of pregnancy. It has bten used in anovulalory sterility, metropathia haernorrhagica, habitual abortion and undescended testis.
cilazapril A long-acting ACE inhibitor with the actions, uses and side-effects of that group of drugs.
Dose: in essential hypertension 1 mg daily initially, increased up to 5 mg daily according to need. In renovascular hypertension 0.25-0.5 mg daily. (Vascace). See page 148 and'I'able 21.
cimitidine A selective histamine H, receptor antagonist. Unlike ordinary antihistamines, it inhibits gastric secretion, and is used in the treatment of peptic ulcer and other conditions of gastric hyperacidity. Dose: 8(m) nig daily for at least 4 weeks, doubled in severe conditions. Dose by i.m. or slow i.v. injection 200 mg 4-4-hourly. The dose should be reduce(] in renal impairment. The drug may increase the effects of oral anticoagulants and phenytoi ii. Side-effects include diarrhoea, rash and dizziness. It has some anti-androgen activity, and gynaecomastia is all occasional side-effect with high closes. (Dysparneu Tagarnet; Zila). See page 162 and Table 27.
cinchor-aine A local anaesthetic used as
ointment 1% in haemorrhoids and
pruritus. (Nupercainal).
cinnarizine An antihistamine, chiefly of value in Wniere’s disease, although it is also used in travel sickness and in peripheral vascular disorders.
Dose: 45-90 ing daily. Drowsiness and gastrointestinal disturbances are side-effects. (Stugeron).
cinoxacin A quinolone derivative with actions, uses and side-effects similar to i hose of nalidixic acid.

Dose: in urinary tract infections,  daily; prophylaxis 500mg daily. Contraindicated in severe renal impairment. (Cinobac).
ciprofbrate A blood-lipid lowering agent used in diet-resistant hyperlipidaemia as a single daily dose of 100-200 mg. (Modalim). See page 146 and Table 20.
ciprofloxacin A quinolone with a wide range of activity against both Gram-positive and Gram-negative bacteria, including Pseudomonas and Fronts. It is effective in many systemic infections, as well as in bone, joint and urinary infections, and in gonorrhoea, but is indicated mainly in infections resistant to other antibacterial agents. Dose: 500 mg -1.5 g daily for 5-7 days; in gonorrhoea, a single dose of 250 mg is given. In severe infections 200-400 mg daily by i.v, infusion for 5-7 days. Side-effects include nausea, dizziness, headache, rash and pruritus. plasma levels of theophylline may be increased and should be closely controlled. Care is necessary in convulsive disorders. (Ciproxin).
cisapride A gastrointestinal stimulant given to relieve gastro-oesophageal reflex and delayed gastric emptying.
Dose: .10-40 mg daily before meals, and at night, for some weeks. Side-effects are abdominal pain and diarrhoea. Drugs that delay the excretion of cisapride and may cause arrhythmias are erythromycin and clarithromycin-antigungal agents of the ketoconazole type should also be avoided. Unlike metoclopramide, it has no central antiemetic properties. (Alimix; Prepulsin).
cisatracurium A non-depolarizing neuromuscular blocking agent with an intermediate duration of activity. It is used as a muscle- relaxing adjunct in general anaesthesia, and to facilitate tracheal ininhation. (Nimbly).
cisplatin A cytotoxic agent containing platinum bound in an organic complex. The action is linked with drug-induced changes in DNA structure that inhibit cell development. It is used in ovarian, testicular and other solid tumours, and in resistant malignant conditions, sometimes in association with other antineoplastic agents.
Dose: by i.v.  for 5 days a month, or 15-120 mgIm’ monthly. Blood tests are essential
throughout treatment. Side-effects, which may be severe, include nausea, vomiting, and oto-, nephro- anti
citalopram A selective serotoninreuptake inhibitor (SSRI).
Dose: used in depression in single daily doses of 20 ing, increased up to 40 mg daily. Treatment for at least 6 months necessary to avoid relapse. (Cipraruil). See page 128 and Table 11.
cladribine A new agent used by specialists in hairy cell leukaemia. (Leustat).
clarithronlycin A macrolide antibiotic similar to erythromycin, but with better absorption and reduced gastrointestinal side-effects.
Dose: 250 rug twice a day for 7 days, doubled in severe infections. Care in hepatic an([ renal impairment. It may potentiate the effects of warfarin and digoxin. Should not be given with astemizole or terfenadine (risk of arrhythinias). (Khricid).
clavulanic acid An inhibitor of betalactanlase. Many penicillin-resistant organisms contain that enzyme in the cell wall, which inactivates the penicillin before it call enter the cell and exert its bacterial action. clavulanic acid inhibits such enzyme activity, and so facilitates the penetration of the antibiotic into the bacterial cell. It is used in association with amoxycillin as coamoxiclav (Augmentin) and with ticarcillin as Tinientin, in the treatment of infections due to amoxycillin-resistant bacteria.
clemastine An antihistamine used in allergic rhinitis, urticaria and allergic derniatoses.
Dose: I mg twice a day. In common with other antihistamines, it may cause drowsiness, and anticholinergic side-effects such as dryness of the mouth. H avegil). See
page 110 and Table 2.
clindamycin An antibiotic used mainly in staphylococcal bone and joint infections not responding to other drugs. It is also useful in anaerobic abdominal infections.  A serious side-effect is a potentially fatal pseudomernbranous colitis, and the drug should be withdrawn immediately if diarrhoea occurs. See vancomycin and nietronidazole.