Over-the-counter sleep aids effectiveness
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Effectiveness of Over-the-Counter Sleep Aids: Diphenhydramine, Doxylamine, Melatonin, and Valerian
Diphenhydramine and Doxylamine: Antihistamine Sleep Aids
Diphenhydramine and doxylamine are common antihistamines found in many over-the-counter (OTC) sleep aids. Studies show that diphenhydramine can improve sleep parameters such as sleep latency and next-morning restfulness in people with mild to moderate insomnia, but it is also associated with more side effects compared to placebo 13. However, the overall clinical evidence supporting the long-term efficacy and safety of diphenhydramine and doxylamine is limited, especially in older adults 125. In older populations, these medications are often used inappropriately for chronic sleep problems, which increases the risk of daytime sedation, cognitive impairment, and falls . Despite these risks, diphenhydramine is still widely used, often based on perceptions of effectiveness and safety rather than strong clinical evidence .
Melatonin: Hormonal Sleep Aid
Melatonin, a hormone that regulates the sleep-wake cycle, is another popular OTC sleep aid. Research indicates that melatonin, particularly in prolonged-release formulations, is effective in improving sleep onset and sleep quality, especially in older adults with diagnosed insomnia 12. Melatonin is generally well-tolerated and has fewer safety concerns compared to antihistamines . However, immediate-release melatonin and its use in younger populations show less consistent benefits . While melatonin is widely used and considered safe at low doses, there is limited research on its long-term effects and potential toxicity .
Valerian: Herbal Sleep Aid
Valerian is a herbal supplement often marketed for sleep improvement. The available evidence suggests that valerian does not have a significant effect on either subjective or objective sleep outcomes 12. It is generally considered safe, but its lack of proven efficacy limits its usefulness as an OTC sleep aid 12.
Over-the-Counter Sleep Aids in Special Populations
Older Adults
Older adults frequently use OTC sleep aids, with more than a third reporting use of these products to manage sleep problems 2510. Melatonin appears to be the most effective and safest option in this group, while antihistamines like diphenhydramine and doxylamine pose greater risks due to side effects such as sedation and cognitive impairment 25. There is a need for more research and better education on the appropriate use of OTC sleep aids in older adults to reduce inappropriate use and associated risks .
Children
OTC sleep aids, including antihistamines and supplements, are sometimes used in children, but behavioral interventions are recommended as the first line of treatment . The evidence for the effectiveness and safety of these products in children is limited, and their use should be approached with caution 89.
Patterns of Use and Perceptions
OTC sleep aids are widely used, often without medical guidance. Many users rely on recommendations from family or friends rather than healthcare professionals, which can lead to misuse, such as long-term use or incorrect dosing 467. Community pharmacists can play a key role in educating consumers about the appropriate and safe use of these products 57.
Conclusion
Over-the-counter sleep aids are commonly used for occasional sleep disturbances, but their effectiveness varies. Melatonin, especially in prolonged-release form, has the most consistent evidence for improving sleep, particularly in older adults, and is generally safe. Diphenhydramine and doxylamine may help with sleep onset but carry a higher risk of side effects, especially in older adults. Valerian lacks strong evidence for effectiveness. Overall, more research is needed, especially for long-term use and in special populations such as older adults and children. Education and guidance from healthcare professionals are important to ensure safe and effective use of OTC sleep aids.
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Most relevant research papers on this topic
Diphenhydramine in Insomniac Family Practice Patients: A Double‐Blind Study
Diphenhydramine, 50 mg at bedtime, significantly improves sleep parameters and restfulness in mild to moderate insomniac patients, with patients preferring it over placebo despite more side effects.
Sleep Health and Appropriate Use of OTC Sleep Aids in Older Adults—Recommendations of a Gerontological Society of America Workgroup
Older adults are more likely to use OTC sleep aids inappropriately, posing risks like daytime sedation and cognitive decline.
Factors associated with the use of over-the-counter sleep aids containing diphenhydramine: A cross-sectional study in Saudi Arabia
Panadol Night use in Saudi Arabia is significantly associated with perceptions of effectiveness and safety, insomnia history, pain, and sleep quality.
The Role of Supplements and Over-the-Counter Products to Improve Sleep in Children: A Systematic Review
Supplements and over-the-counter products, specifically iron, hydroxytryptophan, theanine, and antihistamines, can improve sleep quality in children with sleep disorders.
Prescription and Nonprescription Sleep Product Use Among Older Adults in the United States.
More than a third of older adults use medications or aids to help with sleep, most commonly over-the-counter aids.
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