AARP News (blog) | Common Sleep and Allergy Medications Linked to Dementia, Alzheimer's AARP News (blog) A new study links long-term use of common medications — including over-the-counter drugs for insomnia and hay fever — to a higher risk of dementia, including Alzheimer's disease. Medications in the study included antihistamines found in Benadryl ... Over-the-counter sleep aids linked to dementia Study suggests sleeping drugs can increase risk of Alzheimer's Media dementia scare over hay fever and sleep drugs |