A new study, published Monday, offers the most definite proof yet of what scientists have known for at least a decade: that anticholinergic drugs (PDF) are linked with cognitive impairment and an increased risk of dementia. Though you may have never heard of this class of drug, you've certainly heard of the medications themselves, including Benadryl, Demerol, Dimetapp, Dramamine, Unisom and VESIcare. They are sold over the counter and by prescription as sleep aids and for chronic diseases including hypertension, cardiovascular disease and chronic obstructive pulmonary disease (COPD). The new study is the first to examine the physical changes that...