Anticholinergic side effects of antihistamines include?

Anticholinergic side effects of antihistamines can include dry mouth, blurred vision, constipation, and urinary retention. These effects occur due to the blockade of acetylcholine receptors, which can impact various bodily functions. Additionally, some individuals may experience confusion or drowsiness, particularly in older adults. It's important for patients to be aware of these potential side effects when using antihistamines.