Therapeutic drug monitoring is required in all except:: (A) Phenytoin, (B) Metformin, (C) Tacrolimus, (D) Cyclosporine
Answer is B. Ans. (B) Metformin(Ref: KDT 8th/e p42)* We can easily monitor blood glucose levels as an effect of metformin, thus TDM is not required.* TDM is required for lithium, digitalis, phenytoin, immunosuppressants and anti-arrhythmics, etc.