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In page Hypnotic:

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Other sleep remedies that may be considered "sedative–hypnotics" exist; psychiatrists will sometimes prescribe medicines off-label if they have sedating effects. Examples of these include mirtazapine (an antidepressant), clonidine (an antihypertensive medication), quetiapine (an antipsychotic), and over-the-counter allergy and antiemetic medications doxylamine and diphenhydramine. Off-label sleep remedies are particularly useful when first-line treatment is unsuccessful or deemed unsafe (as in patients with a history of substance use disorders).[citation needed]