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Agonists vs antagonists

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What does agonists and antagonist mean? When I read up on Seroquel from the pins here on the forum those two words sometimes come up.

antagonist = act against or block a receptor

agonist = promote the action at a receptor

Thus, an antipsychotic that blocks, say, D2 receptors acts as an antagonist at that receptor.

Certain Parkinson's disease meds are dopamine agonists, meaning that they promote the action of dopamine at dopamine receptors

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