Which class of antihistamines is typical of causing sedation in many patients?

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Multiple Choice

Which class of antihistamines is typical of causing sedation in many patients?

Explanation:
Sedation from antihistamines happens when the drug enters the brain and blocks H1 receptors there. This is typical of first-generation H1 antagonists, which are relatively lipophilic and cross the blood-brain barrier, causing drowsiness as a common effect. They often have anticholinergic properties that can amplify CNS effects. In contrast, second-generation H1 antagonists are designed to largely avoid CNS entry, so they cause far less sedation. The other two options are not antihistamines and don’t share this CNS-penetration pattern.

Sedation from antihistamines happens when the drug enters the brain and blocks H1 receptors there. This is typical of first-generation H1 antagonists, which are relatively lipophilic and cross the blood-brain barrier, causing drowsiness as a common effect. They often have anticholinergic properties that can amplify CNS effects. In contrast, second-generation H1 antagonists are designed to largely avoid CNS entry, so they cause far less sedation. The other two options are not antihistamines and don’t share this CNS-penetration pattern.

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