All the following drugs undergo metabolism by acetylation EXCEPT: (A) INH, (B) Hydralazine, (C) Procainamide, (D) phenytoin
Answer is D. Ans) d) (Phenytoin) Ref: KDT 6th ed pg25Compounds having amino or hydrazine residue are conjugated wiyh the help of acetyl Co enzyme - A which include drugs like sulphonamides, INH, PAS, hydralazine, clonazepam, procainamide Phenytoin is metabolised in liver by hydroxylation and glucoronide conjugation.