Therapeutic drug monitoring is required for all drugs except:
Therapeutic drug monitoring (TDM) is useful for digoxin, anticonvulsants, antiarrhythmics, theophylline, aminoglycoside antibiotics, lithium, tricyclic antidepressants. not useful for drugs whose response is easily measurable antihypeensives, hypoglycaemics (Metformin), diuretics, oral anticoagulants(Warfarin), general anesthetics. Ref; KD Tripathi pharmacology 7th edition (page no; 34)
Phenytoin
Metformin
Tacrolimus
Cyclosporin
General pharmacology