Therapeutic Index is:
ref; KD Tripathi Pharmacology 7th edition (page no:55) The gap between the therapeutic effect DRC (Dose Response Curve)and the adverse effect DRC defines the safety margin or the therapeutic index of a drug. Therapeutic index =median lethal dose /median effective dose or LD 50 / ED 50
ED50/LD50
LD50/ED50
ED50-LD50
ED50 XLD50
General pharmacology