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.
Asymmetric facial weakness and sagging are a classic presentation of Facial Nerve paralysis, termed Bell's Palsy (after the Scot physician Charles Bell who described it). It classically comes on suddenly and in most, but not all cases, resolves completely with near-normal to normal facial muscle functions.