Posts Tagged ‘carcinoma’

mepacrine A synthetic antimalarial. Now replaced by chloroquine and other powerful drugs. It is used occasionally in the treatment for Giardia laynblia infections. Dose: 300 mg daily for 5-8 days.
tmeprobamate A mild tranquillizer used Ili anxiety and tension states, but its extended use may lead to dependence. Dose: 1.2-2.4 g daily. Side-effects are drowsiness, headache, gastrointestinal and visual disturbances. It has been largely replaced by benzodiazepine anxiolytics. (Equallil).
meptazinol An analgesic for the relief of moderate to severe pain. It has a more rapid and extended action than morphine, and is less likely to cause respiratory depression or induce dependence.
Dose: 800-1600 nig orally daily. In severe pain, 50-100nig by injection, repeated as required; in obstetric analgesia, 2 nig/kg. The action can be partly antagonized by naloxone. Side-effects include dizziness and nausea. (IMeptid).
rinequitisizine An antihistamine used for the symptomatic relief of allergic states such as haytever and urticaria. It is less likely to Cause sedation than sonic other antihistamines.
Dose: 10 mg daily. Side-effects may include dry mouth and blurred vision. (Prinialan). See page 110 and Table 2.
mercaptopurine A cytotoxic agent used in the treatment of acute leukaemia.
Dose: 2.5 niWkg daily. Close haernatologi,al control is essential, as the drug has .1 marked niyelosuppressive action. \.lercaptopurine is also hepatotoxic, and should be withdrawn if jaundice occurs. (Puri-Nethol). See page 122 and Table 8.
meropenem An antibiotic similar to imipenem. but more resistant to breakdown by renal enzymes, so combined use with an enzyme inhibitor is unnecessary. Dose: given by i.v. infusion in doses of 500 mg-2 g 8-hourly according to the severity of the infection. Care is necessary in hepatic disease. (Meronem).
mesalazine The active metabolite of sulphasalazine. It is not suitable for oral
use as such, but can be given as a resin-drug complex, so that the drug reaches and is released in the colon unchanged. It is used both for the acute attack and for the maintenance of remission of ulcerative colitis, particularly in patients unable to tolerate sulphasalazine.
Dose: 1.2-2.4 g daily. Side-effects include gastrointestinal disturbances, and care is necessary in patients hypersensitive to salicylates. Patients should be advised to report an), bruising, bleeding or malaise. If .a blood dyscrasia is suspected, a [)food count should be done and the drug withdrawn. Lactulose should not be used as a laxative, as it may hinder the release of the active drug. Also used as enema and suppositories. (Asacol; Pentasa; Salofalk). See page 172 and Table 32.
mesna A compound used to prevent the liaemorrhagic cystitis caused by the cytotoxic drugs cyclophosphamide and ifosfamide. The reaction is caused by the metabolite acrolein, and mesna reduces the toxicity by combining with acrolein in the urinary tract.
Dose: 20%, of that of the cytotoxic drug, and should be given at the same time by i.v. injection. Subsequent supportive doses may be given orally or by injection il - 8 hours after therapy. (Uromitexan).
mesterolone An orally active androgen with the actions and uses of testosterone. It is used in androgen deficiency and male infertility but, unlike other androgens, it does not inhibit endogenous androgen production, and is less hepatotoxic. Dose: 75-100 mg daily for sonic months. (I'm Viron).
mestranol An orally active oestrogen present in some oral contraceptive products. See page 264.
metaraminol A sympathornimetic agent that increases the blood pressure by a general constriction of the peripheral blood vessels. It is used mainly in the acute hypotension that may occur with spinal anaesthesia. It has also been used in shock, but the use of vasoconstrictors has declined, as in shock the peripheral resistance may be already high, and the use of blood volume expanders and dopamine and dubotamine is now preferred.
Dose: 15-100 mg 1)), i.v. infusion. Side-effects are tachycardia and reduced renal blood How. It is contraindicated in myocardial infarction. (Aramine).
metformin An orally active biguanide hypoglycaemic agent. Its action differs from that of the sulphonylureas, as it acts by increasing the peripheral uptake of glucose. It is used mainly in non-insulindependent diabetes not controlled by diet and sulphonylurea therapy.
Dose: 1.5-3 g daily according to need and response. Side-effects include nausea and transient diarrhoea. 11 may cause lactic acidosis and it should not be used in patients with renal impairment. (Glucophage). See page 131 and Table 13.
tmethadone A morphine-like analgesic with reduced sedative effects. Ofvalue in severe pain, and in the relief of useless cough in terminal disease.
Dose: 5-10 mg orally or by i.m. or s.c. injection, in intervals according to need. Prolonged treatment carries the risk of cumulative effects and overdose.
(Physeptone).
methenamine See hexarnine.
methionine A sulphur-containing amino acid essential for nutrition. It is used mainly in paracetamol poisoning, often with acetyl cysteine, and given within 10-12 hours.
Dose: 2.5 g 4-hourly up to a total of [0 g.
methocarbamol A skeletal muscle relaxant used in muscle injury and spasm.
Dose: 6g daily orally; 1-3 g daily by slow i.v. injection. It may cause drowsiness, dizziness and allergic rash. Contraindicated in epilepsy and myasthenia gravis. (Robaxin).
methohexitone A short-acting i.v. anaesthetic similar to thiopentone. It is used mainly for the induction and maintenance of anaesthesia for short operative procedures, when the quick recovery may be an advantage. (Brietal).
methotrexate A cytotoxic agent that acts by inhibiting the synthesis of purines, and so indirectly interferes with cell proliferation. It is used chiefly for maintenance therapy in the remission of acute lymphoblastic leukaemia in children, but it has been used in choriocarcinoma as well as some lymphomas and solid tumours.
Dose: in children, I5 mg/in' weekly. It is sometimes effective in resistant psoriasis, and is given in oral doses of 10-25 nig weekly under specialist supervision. It is occasionally used in severe rheumatoid arthritis not responding to other treatment in doses of 7.5 mg once weekly. Side-effects are those of gastrointestinal toxicity, niyelodepression, rash and cirrhosis. Blood counts and liver function tests during treatment are essential. Cough and dyspnea may indicate pulmonary toxicity. Aspirin and non-steroidal anti-inflaniniatory drugs (NSAIDs) should be avoided, as they delay the excretion of methotrexate and increase its toxicity. See page 122 and Table 8.
methotrimeprazine An antipsychotic agent of the chlorpromazine type, with similar actions, Uses and side-effects. It is used in schizophrenia when a sedative effect is also required.
Dose: 25 -50 mg daily, but much larger doses, up to 1 g daily, may be required, particularly for bedfast patients. It is of value as an adjunct to other therapy in terminal illness and is sometimes given by continuous s.c. infusion in doses of 25-200 ing over 24 hours. Postural hypotension may occur in elderly ambulant patients. (Nozinan). See page 168 and Table 30.
methoxamine A sympathomimetic agent that increases the blood pressure by constriction of the peripheral vessels. It is used in the hypotension following spinal anaesthesia; to correct an excessive response to antihypertensive drugs; and to arrest supraventricular tachycardia. Dose: 5-20 mg by i.m. injection; 5-10 mg by slow i.v. injection. Care is necessary in preexisting hypertension and cardiov.iwular disease (Vasoxine).
methyl cellulose A derivative of cellulose that is used as an emulsifying agent and bulk laxative.
Dose: 1.5-6g with water, but not at night. It is sometimes given in diarrhoea, with a minimum amount of water.
methyl salicylate A pale yellow liquid with a characteristic odour. It has long been used as wintergreen liniment and ointment for the local relief of muscle pain and rheumatic conditions, but is now less popular.

methylated spirit Alcohol containing 5% of wood naphtha. Used for skin preparation and alcoholic applications. The methylated spirit used domestically differs, and is coloured violet to indicate its unsuitability for medicinal use.
methylcysteine A sputum-liquefier claimed to be of value in respiratory conditions where the sputum is viscid. Dose: 600 ing daily. (Visclair).
! Met
other pressor amines. It is used mainly in the preoperative control of adrenaline-producing tumours (pliaeochrornocytoma), and in the long-term treatment of patients unsuitable for surgery.
Dose: I g daily initially, increased if necessary up t(') 4g daily. An adequate fluid intake is essential. Side-effects include sedation, which may be marked initially, diarrhoea, which maybe severe, depression and confusion. (Dernser).
so
methyidopa A centrally acting antihypertensive drug, usually given together with a diuretic. It has the advantage of being relatively safe in asthma, heart failure and pregnancy.
Dose: 750 ing-3 g daily; 250-500 mg by i.v. infusion. Side-effects are drowsiness, depression and diarrhoea. A systemic lupus crytheinatostis-like syndrome may also occur, and active liver disease is a contraindication. (Alcloinet). See page 148 an(] Table 21.
tmethylphenidate A central stimulant used occasionally under strict supervision for the treatment of hyperactive children. Dose: 5-10 mg daily. Witalin).
metoclopramide A stimulant of gastric and small intestine transport. It is used in the treatment of nausea and vomiting generally, including that induced by drugs or migraine, in non-ulcer dyspepsia, and in accelerating the passage of a barium meal.
Dose: 15-30 ing daily orally or by Lin. or i.v. injection. A single dose of 10-20 mg is given by injection 10 minutes before radiological examination. Side-effects include extra-pyramidal reactions, facial sprints and oculogyric crises, mainly in voting persons, and it is best avoided in patient., under 20 years of age. (Maxolon). Some long-acting products are also available. See page 158 and Table 25.
tmethylphenobarbitone An anticonvulsant with the actions, uses and side-effects of phenobarbitone.
Dose: in epilepsy, 100-600 ing daily. (Prominal). See page 136 and Table 15.
methylprednisolone A corticosteroid with the actions, uses and side-effects of prednisolone, and given in similar doses. (Medrone).
methysergide A synthetic drug related to ergonicirine and used in the prevention of severe and recurrent migraine not responding to other drugs.
Dose: 2-6 ing daily. It is also given fur the symptomatic treatment of the carcinoid syndrome in (loses of 12-20 ing daily. Mcthvsergide has many side-effects, including retroperitoneal and cardiac fibrosis, and its use requires expert supervision. (Des-A-ril)-See page 154 and] able 23.
metipranolol A beta-adrenoceptor blocking agent used as eye drops 0.1-0.6% for the treatment of chronic glaucoma.
metirosine An enzyme inhibitor that interferes with the synthesis of adrenaline and
metolazone A diuretic with the actions, uses and side-effects of bendrofluazide.
Dose: in hypertension, 5 mg daily I p
initially; in oedematous statcs,5-20ingor more daily may be given. The diuresis is increased by combined treatment with a loop diuretic such as ffl,lsemide, but monitoring of the response is necessary. (NIctinex). See page 148 and Table 21.
metoprolol A beta-blocking agent used in the control of angina, but also of value in hypertension and the prophylaxis of migraine.
Dose: in angina, 100-300 mg daily; in hypertension, 100-400 ing daily; in migraine prophylaxis and thyrotoxicosis 200 ing daily. It is occasionally given by slow i.v. injection in acute cardiac arrhythinias; dose 1-2 nighnin tip to a total of 10-15 mg. Care is necessary in heart block, bradycardia and pulmonary disease. (Betaloc; Lopresor). See page 114 and Table 4.
metriphonate An organophosphorus schistosornicide, but used only in infections of the hookworm Schistosonia haemobitim, which is found in the genitourinary veins.

bezafibrate A plasma-lipid regulating agent with an action similar to clofibrate, and used in the treatment of hyperlipidaemia not responding to diet.
Dose:daily with food. Contraindicated in renal or hepatic dysfunction. May potentiate oral anticoagulants. Side-effects are nausea, pruritus and urticaria. (Bezalip). See page 146 and Table 20.
Dose: It is given in hypertension and angina in doses of 5-20 nig daily. (Enicor; Monocor). See pages 114 & 148, and fables 4 & 21.
bisphosphonates Substances used in Paget’s disease of bone and hypercalcaemia of malignancy. See alendronate, disodium etidronate, disodium pamidronate and sodium clodronate.
bicalutamide A nonsteroidal anti-androgen that binds, selectively with androgen receptors. It is used with an LH-111-1 analogue such as goserelin in advanced prostatic cancer in doses of 50 mg daily. (Casodex). See page 122 and Table 8.
bipetiden An antispasmodic and parasympatholytic drug used chiefly to control the rigidity and excessive salivation of parkinsonism. It has less effect on tremor.
Dose: 2 ing daily initially, increased, as required, up to 0 mg or more daily. If necessary it may be given by i.m. or slow i.v. injection in doses of 5-20 mg daily. Side-effects include dizziness, blurred vision and drowsiness. (Akineton). See page 160 and Table 26.
BIPP A mixture of bismuth subnitrate, iodoform and liquid paraffin, used occasionally as an antiseptic dressing.
bisacodyl A synthetic laxative that exerts its action by a direct stimulating effect on Ilse nerve endings of the colon.
Dose: 10 mg orally, or as a suppository. Abdominal cramp is an occasional side-effect. It should not be used in intestinal obstruction.
bismuth chelate A potassium-bismuthcitrate complex used to promote the healing of peptic ulcers, mainly by a protective action.
Dose: 480 nig daily for 28 days, repeated if* necessary at monthly intervals. Not to be given with food. It may blacken the faeces. (Dc-NoltalO.
bismuth subgallate A yellow insoluble powder with astringent properties. Used as dusting powder, and as suppositories for rectal conditions.
bisoprolol A beta-blocking agent with the actions, uses and side-effects of propranolol.
bleomycin A cytotoxic antibiotic, exceptional in causing little or any disturbance of bone marrow activity. Used mainly in skin tumours, lymphomas and mycosis fungoides.
Dose: 15-30 ing twice-weekly by i.m. or i.v. injection up to a total dose of 500 ing. The onset of stomatitis is an indication of the maximum tolerated close. Pigmentation of the skin may occur, but a severe close-related, delayed reaction is
pulmonary fibrosis, requiring immediate withdrawal of the drug. There is a risk of respiratory failure during general anaesthesia associated with a high oxygen intake. See page 122 and ‘rable 8.
botulinum toxin complex Botulinuin toxin causes severe respiratory muscle paralysis, but a modified form has a local action. The complex is used in severe blepharospasm and given by injection into the ocular muscle. Response is slow (1-2 weeks) and treatment may need to be repeated at intervals of 8 weeks. (Botox; Dysport).
bretylium An antihypertensive agent, now used on[), in the control of resistant ventricular arrhythmias.
Dose: i mg/kg, i.m., 6-8-hourly. It may also be given by slow i.v. injection in doses of 5-10 mg/kg, repeated as required. Side-effects include nausea, vomiting and severe hypotension. (Bretylate).
brimonidine A selective alpha,-andrenergic receptor agonist. It is used in the treatment of glaucoma when bcta-blockers are not suitable or not tolerated.
Dose: one drop of a 0.2% solution in the eye or eyes twice daily. Some initial burning and stinging may occur, and an ocular allergic reaction may occur with prolonged therapy. (Alphagan).
bromazepam A benzodiampine used mainly
in the short-term treatment of anxiety.

Dose: 9-18 mg daily. Contraindicated in respiratory depression and phobic states. (I-exotan). See page 117 and fable 5.
bromocriptine An inhibitor of the release of prolactin from the pituitary gland. It is used to prevent or suppress lactation when other measures have failed.
Dose: 1-1.5 mg daily initially for a few days, then twice daily for 14 days. It also stimulates dopamine receptors in the brain and is used in parkinsonism, mainly in patients unable to tolerate levodopa, to stimulate any surviving dopamine receptors. Dose: 1.25 mg at night initially, with food, slowly increased according to response up to 40 mg. The use of the drug requires care, as it has many side-effects, including early hypotensive reactions. Bromocriptine is also used in some condi- tions of pituitary dysfunction such as acromegaly. (Pardolcl). See page 160 an(] Table 26.
brompheniramine An antihistamine similar to promethazine, but with shorter action and reduced side-effects. It also has some antitussive properties.
Dose: 12-32 mg daily. (Dimotane). See pate 110 and Table 2.
budesonide A steroid similar to beclomethasone, and used by oral aerosol inhalation in chronic airway obstruction and other asthmatic conditions.
Dose: 200800 pglkg (1-4 puffs) according it) need. A long-acting form (Entocort) is used in the treatment of Crohn’s disease. Dose: 9 nig daily before breakfast for up to 8 weeks. Also used locally as a cream (0.025%) in eczema, psoriasis and
dermatitis. (Pulmocort; Preferid).
bumetanide A rapidly acting loop diuretic similar to frusemide, with comparable actions, uses and side-effects.
Dose: 1-5 mg daily. Much larger doses may be needed when renal function is impaired. In acute pulmonary and cardiac oedema, 1-2 mg may be given i.v. Morirxx). See page 148 and “fable 21.
bupivacaine A local anaesthetic related to lignocaine but characterized by its increased potency and long duration of action which may be tip to 8 hours when used for nerve blocks. It is also of value in continuous epidural analgesia. It is used as a 0.25% to 0.5% solution in doses
according to requirements with or without adrenaline. The side-effects are those of lignocaine, but it may cause more severe myocardial depression. (Marcain).
bupronorphine A powerful analgesic, related to morphine, but less likely to cause dependence. Valuable in pain of terminal cancer, after operation or myocardial infarction.
Dose: 200-100 Vg 6-8-hourly as sublingual tablets, or 300-600 pg by i. in. or slow i.v. injection at intervals of 6-8 hours according to need. Side-effects include drowsiness, nausea and dizziness. Naxolone is only a partial antagonist. f *1 enigesic).
buserelin A synthetic gonadotrophinreleasing hormone that indirectly depresses androgen and oestrogen synthesis. It is used in the treatment of testosterone-sensitive prostatic carcinoma.
Dose: 500 Vg by s.c. injection 8-hourly for 7 clays, followed of    bv intranasal mainte- nonce dosesdoseso100 pg’6 times a day. Patients should be warned that an
increase in pain may occur initially. Side-effects are hot flushes and loss of libido. (Suprefact). It is also used its a nasal spray in the long-term treatment of endometriosis in doses of 900 pg daily. Side-effects are menstrual-like bleeding and mood changes. (Suprecur). See goserelin, lcuprorelin and nafarelin.
buspirone A drug for the treatment of anxiety. It acts more selectively than the benzod iazepi ties on serotonin receptors in the brain, but the full response may take 1-2 weeks.
Dose: 10-15 mg daily initially, slowly
in, ceased as required up to a maximum of 45 mg daily. Side-effects are nausea, dizziness and drowsiness. Benzod  must be withdrawn slowly before transfer to buspirone. ( Ruspar). See page 117 and “fable 5.
busulphan A cytotoxic compound used in the palliative treatment of chronic myeloid leukaemia. Close haernatological control is essential during treatment as remission of symptoms may not be complete for some weeks and overdose may cause irreversible myelodepression.
Dose: 0.5-4 mg daily. Side-el’16:ts include pigmentation of the skin. (vIvIeran).

A-Z Principal Drugs (Alprazolam - Aminophylline)

alprazolam

A benzodiazepine used in the shors-term treatment of anxiety and anxiety with depression.
Dose: 0.75-3 mg daily. Side-effects include dizziness and ataxia. Care is necessary in pulmonary insufficiency. (Xanax). See page H 7 and Table 5.
alprostadil A preparation of prostaglandin li, for i.v. use in maintaining the patency of the ductus arteriosus in neonates with congenital heart lesions requiring surgical correction. The improvement in circulation so obtained permits diagnosis while surgery is being considered.
Dose: 50-100 ng/kg/min i.v. under strict control. Apnoea may occur, usually within an hour of the injection, requiring immediate ventilatory assistance. Bradycardia and hypotension may also occur. (Prostin VR).
alteplase A form of human plasminogen activator with a selective fibrinolytic action on blood-clot-bound plasminogen. It is of value in the early treatment (6 hours) of acute thrombosis, myocardial infarction and pulmonary embolism.
Dose: 10 mg initially by slow i.v. injection; then 90 mg over 3 hours by i.v. infusion. Side-effects are nausea, vomiting and local bleeding. (Actilyse). See streptokinase.
aluminium The powdered metal is used as a skin protective in ileostomy, as Baltimore paste, also known as Compound Aluminium Paste.
aluminium acetate An astringent used as an 8% solution for ear drops in otitis externs. A weak solution (0.65%) is used as a lotion in exudative eczematous states and in suppurative conditions.
aluminium chloride An antiperspirant used in the treatment of axillary hyperhydrosis by the local application of a 20% alcoholic solution. Over-use may cause skin irritation. (Anhydrol; Driclor).
aluminium hydroxide An antacid with a prolonged action.
Dose: as a gel, 7.4-15 ml, or as 500 mg tablets, to be chewed or crushed before swallowing. Best given between meals and at night. May interfere with the absorption of some other drugs. (Aludrox).
alverine An antispasmodic with a local action on intestinal smooth muscle.
Dose: used in irritable bowel syndrome in doses of 60-360 ing daily. (Spasmonal). See page 134 and “Cable 14.
amantadine An antiviral drug thought to act by inhibiting the penetration of the virus into the host cell, and used for the prophylaxis and treatment of influenza. It is also used with levodopa in the treatment of parkinsonism, but it may relieve the rigidity more than the tremor.
Dose: 200 mg daily. Many side-effects are dose-related. (Synimetrel). See page 160 and Table 26.
amethocaine Powerful local anaesthetic, used [or anaesthetic of mucous
membranes 1-2% solution, eve drops 0.25-1 %. As spray for throat before endoscopy, etc, a 0.5% solution may be used. Hypersensitivity and allergic reactions may occur as with other local anaesthetics. Also used as 1% cream for pruritus ,i nd other skin conditions.
amifostine An organic thiophosphoric acid used to reduce neut ropen ia -associated risks of infection after cyclophosphamide and platinum treatment of ovarian cancer. Dose: by i.v. infusion 910 mg/m: daily .10 minutes before chemotherapy.
I lypotension is a side-effect that may limit treatment. (Ethyol).
amikacin A semi-synthetic antibiotic similar in actions and uses to gentamicin, but more resistant to enzyme inactivation. Mainly used in the short-term treatment of serious infections due to Gram-negative, gen tain ici it -resistant organisms.
Dose: 15 ing/kg daily by i.m. injection or i.v. infusion, up to a total treatment dose of 15 g. Side-effects include ototoxicity, drug fever, rash and nausea. Dose should be reduced in renal impairment. (Amikin).
amiloride A potassium-conserving diuretic ,,uh an action on the distal tubule similar to that of spironolactone, although it is not an inhibitor of aldosterone. It is used in
hypertension and heart failure, often with a thiazide diuretic to obtain a more balanced response.
Dose: 5-20 ing daily. Rash is an occasional side effect. See page 148 and Table 2I.
amino acids Certain amino acids are essential for the formation of protein. When oral nutrition is not possible, amino acid preparations may be given by i.v. i ritusion. and such therapy call be extended if necessary to provide total parenteral nutrition by the addition of glucose, electrolytes, fats and vitamins as specially prepared solutions. [it hospitals, a 24-hour supply for total parenteral nutrition can be provided in a single large container and patients may be taught to administer total parenteral nutrition at home. Representative amino-acid products for i.v. infusion are Aminoplex, Perfusin, Synthamin and Varnin.
arninobenzoic acid An absorbent of some of Elie erythema-producing ultra-violet light waves of sunlight. it is present in sonic suit screen preparations.
aminoglutethimide An inhibitor of adrenal steroid and oestrogen biosynthesis. It is used in the control of post-menopausal oestrogen-dependent mammary carcinoma and in the treatment of advanced prostatic carcinoma.
Dose: 250 mg daily, increased, if necessary, to I g daily. Supplementary corticosteroid therapy is essential. Side-effects include drowsiness, rash and drug fever. (()j iineten). See page 122 and Table 8.
aminoglycosides A group of antibiotics that includes amikacin, gentamicin, netilmicin, lobramycin, kanamycin, streptomycin, neomycin and framycetin. They act mainly against Gram-negative bacilli, although they are also active against some Gram-positive organisms. Kanamycin and streptomycin are also active against Mycobacterhan tuberciaosis.'rhe aminoglycosides are not absorbed orally and when injected they are more toxic than most other antibiotics, and in renal impairment care is necessary, as the plasma concentration of the antibiotic may rise to an ototoxic or nephrotoxic level. The toxicity may also be increased by diuretics of the frusemide type. Measurement of plasma levels is essential in high dosage or continued therapy. Gentamicin is the most widely used aminoglycoside for systemic infections, and neomycin and framycetin, being too toxic for systemic use, are of value in skin infections.
may be given by slow i.v. injection. It is not suitable for Liu. administration. Sustained release oral products available cause less gastric disturbance. (Pecram; I'llyllocontin). See page 118 and 'rable 6.
amiodarone An iodine-containing anti-arrhythmic agent of value in all types of paroxysmal tachycardia, especially when the condition is resistant to other drugs. Dose: 600 ing daily for I week; maintenance (lose: 200 ing or less daily. When a rapid response is required, 5 mg/kg may be given by i.v. infusion under cardiac monitoring. it is contraindicated in bradycardia, pregnancy and thyroid disorders, and care is necessary in hepatic impairment. Pulmonary alveolitis, corneal microdeposits and photosensitivity have been reported as side-effects. (Cordarone).
amitriptyline A tricyclic antidepressant similar in action to imipramine, but it also has anxiolytic and sedative properties. Dose: in depression complicated by anxiety, 30-150 mg daily initially; maintenance dose: 20-100 mg daily; sometimes as a single nightly dose to reduce daytime sedation. Lower doses are often adequate in elderly patients. Dose by injection, 40-80 nig daily. Full benefit may not be achieved for some weeks and prolonged therapy may be necessary to avoid relapse. Withdrawal of the drug should be gradual. Atnitriptyline is also used in nocturnal eneuresis in children. Dose: 25-50 mg daily. Side-effects include dryness of the mouth, sedation and cardiac arrhythinias. It is contraindicated in glaucoma, prostatic hypertrophy and after recent myocardial infarction. Mcnti7o];Tryptizol). See page 128 and Table 11.
amlodipine A calcium channel blocking agent used in hypertension and myocardial ischaemia associated with angina.
Dose: 5-10 mg as a single daily (lose. Side-effects are headache, dizziness, flushing and oedema. Care is necessary in renal impair nient. (Istin). See page 148 and Table 21.
ammonium chloride A mild expectorant present in Ammonia and Ipecacuanha Mixture.
aminophylline A derivative of theophylline with a similar bronchodilater action. It i,, used chiefly in asthma, cardiac oedema and congestive heart failure.
Dose: 300 nig-1.2g orally daily; 5 nig/kg