Definition: A class of pharmacopeial preparations that are liquid suspensions or dispersions intended for external application; some consist of finely powdered, insoluble solids held in more or less permanent suspension by suspending agents or surface-active agents, or both; others are oil-in-water emulsions stabilized by surface-active agents.
[L. lotio, a washing, fr. lavo, to wash]
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Examples: glitazone, GI cocktail, etc.