The main ingredient in a medicine that causes the desired effect of the medicine. Some medicines contain more than one active pharmaceutical ingredient that act in different ways in the body. An Active Pharmaceutical Ingredient (API) is the core component in any medication that provides the intended health effect. APIs are fundamental to a drug’s therapeutic action, interacting with the body to produce the desired outcome. An active ingredient is any component that provides pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the. Active ingredients are the chemical compounds in medicines that have an effect on the body. Essentially, they are the ingredients within your medicine that make the medicine work. An active ingredient is any ingredient that provides biologically active or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease or to affect the structure or any function of the body of humans or animals. An active pharmaceutical ingredient (API) is the part of any medication that produces the intended health effects. Learn why it's important to know what that is before taking one. Search or browse our A-Z lists of active ingredients available in the United States. Access drug & treatment information, identify pills, check interactions and set up personal medication records. Subscribe to our newsletter for the latest medication news, new drug approvals and FDA alerts. An active ingredient is any ingredient that provides biologically active or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease or to affect the structure or any function of the body of humans or animals. The active ingredients in medication are the components that trigger the effect you are looking for. For example, the active ingredient in blood pressure medication is the compound that works to lower your blood pressure. The biologically active component of a drug or pesticide is referred to as the active ingredient or the active substance.