Quick answer: Kirkland Sleep Aid tablets (Kirkland Signature Nighttime Sleep Aid) contain 25 mg of doxylamine succinate, a sedating antihistamine. The US label lists one use: helping reduce difficulty falling asleep. It warns against use in children under 12, says to avoid alcohol and take it only at bedtime, and advises stopping and seeing a doctor if sleeplessness lasts more than two weeks....
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