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Active pharmaceutical ingredient
An Active Pharmaceutical Ingredient, or API, is the substance in drug that is pharmaceutically active .
A capsule, tablet, syrup, intravenous fluid, or any other formulation of a drug is traditionally composed of two things: The API, which is the drug itself; and an excipient, which is the substance of the tablet, or the liquid the API is suspended in, or other material that is pharmaceutically inert.
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