Which symptoms are associated with anticholinergic drug interactions?

• A. Dry mouth, urinary retention, and confusion
• B. Nausea, vomiting, and diarrhea
• C. Hypertension and tachycardia
• D. Sedation and drowsiness

Answer: (A)

Anticholinergic effects come from blocking muscarinic receptors, which reduces acetylcholine signaling in both the body and brain. This leads to dryness of secretions (dry mouth) because glands aren’t stimulated to produce saliva, urinary retention because the bladder’s detrusor muscle isn’t adequately activated to empty, and cognitive changes such as confusion due to decreased cholinergic activity in the brain. These are the hallmark features of anticholinergic interactions. Nausea, vomiting, and diarrhea are not typical; in fact, anticholinergic drugs tend to slow gut motility and can cause constipation. Hypertension isn’t a primary feature, though tachycardia can occur, and sedation can happen with various drugs but doesn’t define the anticholinergic profile as clearly as the dry mouth, urinary retention, and confusion trio.