noun (used with a singular verb)
the branch of pharmacology dealing with the course of action, effect, and breakdown of drugs within the body.

1835–45; pharmaco- + dynamics

pharmacodynamic, pharmacodynamical, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pharmacodynamics (ˌfɑːməkəʊdaɪˈnæmɪks)
(functioning as singular) the branch of pharmacology concerned with the action of drugs on the physiology or pathology of the body

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pharmacodynamics phar·ma·co·dy·nam·ics (fär'mə-kō'dī-nām'ĭks)
The study of the action or effects of drugs on living organisms.

phar'ma·co'dy·nam'ic adj.
The American Heritage® Stedman's Medical Dictionary
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