Which vitamin deficiency may be observed in a patient on INH therapy: September 2012
Thiamine
Pyridoxine
Folic acid
Cyanocobalamin
Ans: B i.e. Pyridoxine The main cause of pyridoxine deficiency is a lack of pyridoxine in the diet. Another cause of vitamin B6 deficiency is the use of the ATT medication isoniazid, and for this reason, it is usually replaced with vitamin B6 whilst using this drug.