Which of the following drugs require therapeutic drug monitoring?: (A) Metformin, (B) Propranolol, (C) Warfarin, (D) Phenytoin
Answer is D. * Therapeutic drug monitoring is adjustment of dose of the drug according to its plasma concentration. It is required for A Aminoglycosides (e.g. gentamicin) Drug Digitalis Possessing Phenytoin (anti-epileptics) Low Lithium Therapeutic Tricyclic antidepressants Index Immunomodulators (e.g. cyclosporine)