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Definition of pharmacology. 1  1 : the science of drugs including their origin, composition, pharmacokinetics, therapeutic use, and toxicology. 2  2 : the properties and reactions of drugs especially with relation to their therapeutic value.
Freebase (0.00 / 0 votes) Rate this definition: Pharmacotherapy. Pharmacotherapy is the treatment of disease through the administration of drugs. As such, it is considered part of the larger category of therapy. Pharmacists are experts in pharmacotherapy and are responsible for ensuring the safe, appropriate, and economical use of medicines.