ABC News | Common Over-the-Counter Medicines Linked to Dementia in New Study ABC News None of them had dementia or Alzheimer's disease when the study started, and they kept careful records about the drugs they took. The researchers found that people who took more anticholinergic drugs -- which affect the nervous system and are in ... Dementia And Alzheimer's Disease Link To Common Drugs Common Drugs Linked to Increased Risk of Dementia, Alzheimer's Over-the-counter sleep aids linked to dementia |