Therapeutic drug monitoring is essential for the following drug?: (A) Diazepam, (B) Pencillin, (C) Cyclosporine, (D) Metformin
Answer is C. TDM is required for drugs with narrow therapeutic range like1. Immunosuppressants like cyclosporin and tacrolimus,2. Lithium,3. Antiepileptic drugs like phenytoin, Phenobarbitone, Carbamazepine etc.Ref: KD Tripathi 7th ed.Pg 34