<prompt> Pharmacodynamics deals with:-Mode of excretion of a drugMechanism of action of a drugTranspo of drug across the biological membranesLatency of onset  <response>: 2 main branches in pharmacology Pharmacodynamics Studies effect of drug on body, i.e. Action of drug. Mechanism of action Pharmacokinetics Studies effect of body on drug, i.e. Absorption Distribution Metabolism Excretion Option A , C , D is studied in pharmacokinetics of drugs. 