Antihistamine-Induced Urinary Retention in Patients Using OTC Sleep Aids

Mechanism and Risk Factors

• Diphenhydramine, a common ingredient in OTC sleep aids, has significant anticholinergic properties that can impair bladder contraction and contribute to urinary retention in patients with existing urinary difficulties or risk factors for retention 1, 2

Alternative Approaches for Sleep

• The American Academy of Sleep Medicine recommends cognitive-behavioral therapy for insomnia (CBT-I) as first-line treatment for chronic insomnia before considering medication 3
• When pharmacological treatment is necessary, non-benzodiazepine receptor agonists (like zolpidem) prescribed at appropriate doses may be preferable to OTC antihistamines for patients without contraindications 3

Clinical Recommendations

• Consider non-pharmacological approaches to sleep improvement as first-line interventions 3
• For patients requiring pharmacological intervention, consult with a healthcare provider about prescription alternatives with more favorable urinary side effect profiles 3
• Educate patients about the anticholinergic effects of diphenhydramine and similar antihistamines 1