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Drug Class Description
Cardioselective b-blockers (beta- blockers).Generic Name
Metoprolol - migraineDrug Description
Betaloc Tablets: white tablets scored and marked A/BB one side; 100 mg white tablets scored and marked A/ME one side. Betaloc-SA: white sustained- release tablets marked A/MD.Presentation
Betaloc Tablets: Metoprolol tartrate 50 mg , 100mg . Betaloc-SA: Metoprolol tartrate 200 mg .Indications
Migraine prophylaxis.Adult Dosage
Betaloc Tablets: 100 - 200 mg daily in divided doses. Betaloc-SA: 1 in the morning.Child Dosage
Not recommended.Contra Indications
AV block. Uncontrolled heart failure. Severe bradycardia. Sick sinus syndrome. Cardiogenic shock. Severe peripheral arterial disease. Known hypersensitivity to Betaloc or other beta- blockers. Myocardial infarction complicated by significant bradycardia, first degree heart block, systolic hypotension (<100mmHg) and/or severe heart failure.
Special Precautions
May aggravate bradycardia, circulatory disorders and anaphylactic shock. Avoid abrupt interruption of therapy. Withdraw gradually where possible. May be administered where heart failure has been controlled. Consider digitalisation and/or diuretic therapy for patients with a poor cardiac reserve or a history of heart failure. Avoid in patients with reversible obstructive airways disease. Adjustment of hypoglycaemic therapy may be required in labile or insulin- dependent diabetes. Administer alpha-blocker concomitantly in patients with phaeochromocytoma. Liver cirrhosis. Report Betaloc therapy to anaesthetist prior to general anaesthesia - if withdrawal required, complete at least 48 hours before. Pregnancy and lactation.
Interactions
Other antihypertensives, antiarrhythmics, general anaesthetics, verapamil, sympathetic ganglion blocking drugs, other beta-blockers, MAOIs. Clonidine withdrawal - withdraw Betaloc several days before clonidine. Ergotamine, enzyme inducers (eg, rifampicin), enzyme inhibitors (eg, cimetidine), lignocaine (lidocaine), indometacin (indomethacin).
Adverse Reactions
Most commonly, lassitude, GI disturbances (nausea, vomiting or abdominal pain), and disturbances of sleep pattern. Occasionally, CNS effects (eg, dizziness, headache), cardiovascular effects (eg, bradycardia, postural hypotension), respiratory effects (eg, dyspnoea on exertion). Rarely, diarrhoea, constipation, skin rashes and positive anti- nuclear antibodies (not associated with SLE). See Summary of Product Characteristics.
Manufacturer
AstraZenecaDrug Availability
(POM)Updated
09 April 2009