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Agonist. Definition. noun, plural: agonists. (pharmacology) A molecule that combines with a receptor on a cell to trigger physiological reaction. An example is an acetylcholine being the agonist that combines with the cholinergic receptor. (histology) A muscle that contracts while another muscle relaxes, e.g. when bending the elbow the biceps are the agonist.
An inverse agonist is an agent that binds to the same receptor binding-site as an agonist for that receptor and inhibits the constitutive activity of the receptor. Inverse agonists exert the opposite pharmacological effect of a receptor agonist, not merely an absence of the agonist effect as seen with antagonist.An example is the cannabinoid inverse agonist rimonabant. A co-agonist works with other co-agonists to produce the desired effect together.ull agonists bind (have affinity for) and activate a receptor, producing full efficacy at that receptor. One example of a drug that acts as a full agonist is isoproterenol, which mimics the action of adrenaline at Î² adrenoreceptors.