prodrug A substance which, after metabolic action in the body, is coverted to an active drug. prodrug drug modified by biotransformation (i.e. metabolic processes) to achieve desired pharmacological action proÂ·drug (prÅ'drÅ­g) A class of drugs, the pharmacologic action of which results from conversion by metabolic processes within the body.
verb (used without object), sagged, sagging. 1. to sink or bend downward by weight or pressure, especially in the middle: The roof sags. 2. to hang down unevenly; droop: Her skirt was sagging.
vb , lugs, lugging, lugged. 1 to carry or drag (something heavy) with great effort. 2 tr to introduce (an irrelevant topic) into a conversation or discussion. 3 tr (of a sailing vessel) to carry too much (sail) for the amount of wind blowing. n. 4 the act or an instance of lugging.