D2 binding above what percentage correlates with efficacy?

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Multiple Choice

D2 binding above what percentage correlates with efficacy?

Explanation:
When a drug binds to its target receptor, the amount of receptor occupancy often mirrors how strong and consistent the clinical effect will be. For dopamine D2 receptor antagonists, effectiveness tends to appear once enough receptors are occupied. In practice, around 60% occupancy is a commonly cited threshold where therapeutic benefit begins to emerge, while staying below levels that cause excessive adverse effects like extrapyramidal symptoms. Occupancy in the roughly 60–80% range is often considered optimal for balancing efficacy with tolerability. So, interpreting the question, efficacy correlates with D2 binding that is above about 60%.

When a drug binds to its target receptor, the amount of receptor occupancy often mirrors how strong and consistent the clinical effect will be. For dopamine D2 receptor antagonists, effectiveness tends to appear once enough receptors are occupied. In practice, around 60% occupancy is a commonly cited threshold where therapeutic benefit begins to emerge, while staying below levels that cause excessive adverse effects like extrapyramidal symptoms. Occupancy in the roughly 60–80% range is often considered optimal for balancing efficacy with tolerability. So, interpreting the question, efficacy correlates with D2 binding that is above about 60%.

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