Final answer:
Dry mouth, blurred vision, constipation, and urinary retention are side effects of anticholinergic drugs.
Step-by-step explanation:
The side effects described: dry mouth, blurred vision, constipation, and urinary retention, are commonly associated with the use of anticholinergic drugs. These drugs block the action of acetylcholine, a neurotransmitter, in the body. Anticholinergic drugs are used to treat various conditions including overactive bladder, Parkinson's disease, and certain psychiatric disorders.