Materia Medica is that branch of medical science which treats of the substances used as medicine, their origin, physical and chemical properties, physiologic and toxicologic action, preparations, doses, and methods of administration.

Therapeutics

Therapeutics - to cure) is that branch of medicine which treats of the remedial measures used in the management of disease.

Toxicology

Toxicology - poison; - discourse) is that branch of medical science devoted to the study of poisons.

Pharmacology

Pharmacology - medicine;- discourse) is the science of the chemical nature and physiologic action of drugs.

Experimental Pharmacology is the investigation and demonstration of the action of drugs on living tissues.