CURRICULUM. Pharmacology is the branch of biology concerned with the study of drug or medication action,[1] where a drug can be broadly defined as any man-made, natural, or endogenous (from within the body) molecule which exerts a biochemical or physiological effect on the cell, tissue, organ, or organism (sometimes the word pharmacon is used as a term to encompass these endogenous and exogenous bioactive species). More specifically, it is the study of the interactions that occur between a living organism and chemicals that affect normal or abnormal biochemical functions. If substances have medicinal properties, they are considered pharmaceuticals.. This Pharmacology course contains video-based lessons and covers basic definitions, pharmacodynamics, cholinergic drugs, anticholinergic and neuromuscular blocking agents, adrenergic receptors and agonists, alpha and beta-blockers, antidepressants, antiarrhythmic drugs, diuretics, hypertension and anti-hypertensives, drugs for hyperlipidemia, ...