Researchers at University of Washington and a nonprofit called Group Health followed 3,434 adults over age 65 for more than 7 years. None of them had dementia or Alzheimer’s disease when the study started. The researchers found that people who took more anticholinergic drugs were more likely to develop dementia. Anticholinergics include Benadryl and other over-the-counter sleep aids, antihistamines and bladder control medication, and they affect the nervous system. Researchers found that people taking even the minimum effective dosage could be at risk. Via ABC News. Posted January 28, 2015.