(CBS2/FOX28) — You may want to think twice before taking a sleeping aid or an allergy medicine. A drug found in Benadryl, Tylenol P-M, Advil P-M and other Over-the-Counter medications could be causing you more harm than relief.
It is an anticholinergic drug. This class of drug blocks the action of the neurotransmitter acetylcholine to the brain.
A recent study found evidence the drug can cause slow cognitive ability and dementia.
Researchers at Indiana University School of Medicine tested the drug on a few participants and found lower metabolism and reduced brain sizes among people taking the drug.
They also found participants performed worse on short-term memory, verbal reasoning, and problem-solving tests.
Doctors say patients should inform them about any medication they use.