API
Active pharmaceutical ingredient (API), is a biologically active component of a drug product. Drug products are usually composed of several components. The API is the primary ingredient. Other ingredients are commonly known as "excipients" and these substances are always required to be biologically safe, often making up a variable fraction of the drug product. The procedure for optimizing and compositing this mixture of components used in the drug is known as "formulation."
Active pharmaceutical ingredient (API)