- published: 11 Oct 2010
- views: 4546
An active ingredient (AI) is the substance in a pharmaceutical drug or a pesticide that is biologically active. The similar terms active pharmaceutical ingredient (API) and bulk active are also in medicine, and the term active substance may be used for pesticide formulations. Some medications and pesticide products may contain more than one active ingredient. The traditional word for the API is pharmacon or pharmakon (from Greek: (φάρμακον), adapted from pharmacos) which originally denoted a magical substance or drug.
A dosage form : 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. Drugs are chosen primarily for their active ingredients. Because homeopathic products no longer have any biologically active ingredients, their list of ingredients refers to the original ingredients used in their preparation and the finished product no longer contains any active ingredients.
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