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Agonist vs. antagonist. In pharmacology the term agonist-antagonist or mixed agonist/antagonist is used to refer to a drug which under some conditions behaves as an agonist (a substance that fully activates the receptor that it binds to) while under other conditions, behaves as an antagonist (a substance that binds to a receptor but does not activate and can block the activity of other agonists).
A co-agonist works with other co-agonists to produce the desired effect together. NMDA receptor activation requires the binding of both glutamate, glycine and D-serine co-agonists. Calcium can also act as a co-agonist at the IP3 receptor. A selective agonist is selective for a specific type of receptor. E.g.
Whereas D 2 receptor agonists suppress prolactin secretion, dopamine D 2 receptor antagonists like domperidone and metoclopramide have the opposite effect, strongly inducing the pituitary secretion of prolactin, and are sometimes used as prolactin releasers, for instance to correct hypoprolactinemia (low prolactin levels) in the treatment of lactation failure. [2]
Retinoic acid receptor (RAR) and retinoid X receptor (RXR) agonist. Kaposi's sarcoma. Oedema, rashes Bexarotene [22] PO, topical: RXR agonist. Cutaneous T cell lymphoma: Leucopenia, anaemia, lactic dehydrogenase increased, hypochromic anaemia, hyperlipidaemia, hypercholesteraemia, hypothyroidism, haemorrhage, hypertension and kidney dysfunction ...
α 2 agonist: inhibits adenylyl cyclase activity, reduces brainstem vasomotor center-mediated CNS activation; used as antihypertensive, sedative & treatment of opiate dependence and alcohol withdrawal symptoms). Selected examples are: Brimonidine; Clonidine (mixed alpha2-adrenergic and imidazoline-I1 receptor agonist) Dexmedetomidine; Fadolmidine
Cardiovascular agents are drugs used to treat diseases associated with the heart or blood vessels. These medications are available for purchase only with a physician’s prescription . They include, but are not limited to, drugs that target hypertension ( antihypertensives ), hyperlipidemia ( antihyperlipidemics ) and blood clotting (blood ...
An alternative term is serotonin partial agonist/reuptake inhibitor (SPARI), which can be applied only to vilazodone. [ 7 ] It is similar to the marketing strategy used for the drug brexpiprazole , labeling it as a "serotonin-dopamine activity modulator" or 'SDAM'.
Beta adrenergic agonists or beta agonists are medications that relax muscles of the airways, causing widening of the airways and resulting in easier breathing. [1] They are a class of sympathomimetic agents, each acting upon the beta adrenoceptors . [ 2 ]