Narrow therapeutic index is seen with:: (A) Desipramine, (B) Lithium, (C) Penicillin, (D) Diazepam
Answer is B. Ans. B. LithiumDrugs with narrow therapeutic Index: digoxin, theophylline, lidocaine, cyclosporine, clonidine, anticonvulsant (Phenytoin), TCA (imipramine), aminoglycosides, glipizide (not metformin)