a drug that both binds to receptors and has an intrinsic effect; A drug that triggers an action from a cell or a drug

A chemical or drug that turns on or activates a particular part of a cell that regulates it activity (receptor). For example, dopamine agonists used in the treatment of Parkinson's disease activate the dopamine receptors in the brain, resulting in improvement in symptoms.

Drug that binds cellular receptors, which are ordinarily stimulated by naturally occurring substances, triggering a response.

A muscle which directly engages in an action around a joint which has another muscle that can provide an opposing action (antagonist).

A medication that triggers an action from a cell or another medication.

a molecule that triggers the same effects and actions as a naturally occurring molecule or hormone

Hormone Parturition