Alpha Methyldopa Induced Hepatotoxicity in Pregnancy

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Drug-induced hepatotoxicity, also called drug-induced liver injury or drug-induced liver disease, is injury to the liver that is associated with impaired liver function caused by exposure to a drug. Adverse drug reaction has to be considered one of the major causes of iatrogenic disease. Though some of the adverse drug reactions are predictable & preventable, there are many others which cannot be predicted or prevented as there is failure to understand and unravel why, how and in whom they occur.
Methyldopa (L-α-Methyl-3, 4-dihydroxyphenylalanine) is a centrally acting sympatholytic agent (selective α2-adrenergic receptor agonist) that reduces sympathetic drive to the heart and peripheral circulation, leading to decreased cardiac output and lowered peripheral arterial resistance. It was introduced by Oates and his co-workers more than 50 years ago for the treatment of hypertension. Over the years it has been replaced by newer class of antihypertensives in the general population. Nevertheless, during pregnancy it is still the first line agent in treating non complicated pregnancy induced hypertension [1, 2], especially in developing countries. Advantages of methyldopa include the ability to maintain the reduction of blood pressure while the patient is in recumbent position along with the relative absence of orthostatic hypotension. The drug has a half life of two hours with a bioavailability of 42%. Methyldopa sulphate is the major metabolite recorded [3]. It is known to cause mild or reversible but not invariably benign liver disease. Reactive hepatitis is a severe, uncommonly reported side effect. We present here such a case of alpha methyldopa induced hepatotoxicity in pregnancy.
Case Report: A 32 year old woman presented wi...

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...r some days after birth. It can be an infrequent cause for newborn hyberbilirubinaemia with positive Coomb’s test without blood group incompatibility, due to drug induced development of IgG auto antibodies against red blood cells which can cross the placenta and cause haemolysis [10].
Conclusions
Alpha methyldopa is one of the most widely prescribed antihypertensive agents used during pregnancy. It is still the first line agent in treating non complicated pregnancy induced hypertension especially in developing nations. Jaundice has been reported as a rare complication of alpha methyldopa therapy, and abnormalities in liver function tests are occasionally found in patients taking the drug, should be considered in the differential diagnosis. However, the adverse affect alarm or possibility does not herald a contraindication for its use in patients when necessary.

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