A group of widely used drugs available over-the-counter and on prescription could be linked to the development of dementia and Alzheimer’s in older adults, a study has found.

Scientists believe they have found a link between the prolonged use of certain drugs – including certain hayfever and incontinence treatments, and some sleeping tablets and anti-depressants – and reduced brain size.  

Drugs known as anticholinergenics, which block the chemical which transfers electrical impulses between nerves, were also found to lower metabolism.