A powder is a dry, bulk solid composed of a large number of very fine particles
that may flow freely when shaken or tilted. Historically,
powders represent one of the oldest dosage forms. They posses some advantages:
flexibility in compounding and relatively good chemical stability. The main
disadvantages are their unsuitability for dispensing unpleasant tasting or
hygroscopic drugs and inaccuracy of dose (for bulk powders).
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