by Vimal Aga, MD Board-certified Geriatric psychiatrist and Adjunct Assistant Professor of Psychiatry and Neurology, Oregon Health Sciences University, Portland, OR Sedating antihistamines I completely avoid the sedating antihistamines in older adults. Why? Antihistamines can cause daytime drowsiness, sedation, dizziness, dry mucous membranes, blurring of vision, urinary retention, constipation, and other anticholinergic effects, along with…