Many drugs, including hydroxyzine, cause drowsiness. This is because these drugs cause a slowing down of the central nervous system (CNS), called CNS depression. Examples of drugs that cause CNS ...

Exclusion factors were depression, active alcohol consumption or benzodiazepine use. Patients were randomly assigned hydroxyzine 25 mg at bedtime (n = 17) or placebo (n = 18). Sleep quality was ...