Low-potency first-generation antipsychotics cause more side effects due to which receptor block?

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Prepare for the Dr. High Yield Psychiatry Test. Study with flashcards and multiple choice questions, each with hints and explanations. Ensure success in your exam!

Multiple Choice

Low-potency first-generation antipsychotics cause more side effects due to which receptor block?

Explanation:
Low-potency first-generation antipsychotics tend to block multiple receptors beyond dopamine D2, and the extent of non-dopaminergic blockade drives their broader side-effect profile. Histamine H1 blockade is a key contributor to the prominent sedation, weight gain, and fatigue seen with these drugs. While D2 blockade underlies therapeutic effects and some motor side effects, it's the off-target H1 (and other non-dopaminergic) receptor blockade that explains why low-potency agents produce more overall side effects. Among the listed options, histamine blockade best accounts for these non-dopaminergic adverse effects.

Low-potency first-generation antipsychotics tend to block multiple receptors beyond dopamine D2, and the extent of non-dopaminergic blockade drives their broader side-effect profile. Histamine H1 blockade is a key contributor to the prominent sedation, weight gain, and fatigue seen with these drugs. While D2 blockade underlies therapeutic effects and some motor side effects, it's the off-target H1 (and other non-dopaminergic) receptor blockade that explains why low-potency agents produce more overall side effects. Among the listed options, histamine blockade best accounts for these non-dopaminergic adverse effects.

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