Which symptom is a common anticholinergic side effect of oxybutynin?

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Study for the Foundation Year Pharmacy – Clinical Practice Test. Prepare with detailed questions, step-by-step explanations, and test format insights. Enhance your readiness and confidence!

Multiple Choice

Which symptom is a common anticholinergic side effect of oxybutynin?

Explanation:
Anticholinergic drugs like oxybutynin block muscarinic receptors, reducing parasympathetic secretions. Salivary glands rely on acetylcholine signaling to produce saliva, so blocking those receptors lowers saliva output and causes dry mouth. This is a classic and very common side effect of oxybutynin. Diarrhoea would imply increased GI secretions and motility, which anticholinergics actually suppress, leading more often to constipation. Increased tear production would be the opposite of what anticholinergics do—these drugs tend to reduce tear production, causing dry eyes. Headache can occur but is not as characteristic or as consistently linked to anticholinergic activity as dry mouth.

Anticholinergic drugs like oxybutynin block muscarinic receptors, reducing parasympathetic secretions. Salivary glands rely on acetylcholine signaling to produce saliva, so blocking those receptors lowers saliva output and causes dry mouth. This is a classic and very common side effect of oxybutynin.

Diarrhoea would imply increased GI secretions and motility, which anticholinergics actually suppress, leading more often to constipation. Increased tear production would be the opposite of what anticholinergics do—these drugs tend to reduce tear production, causing dry eyes. Headache can occur but is not as characteristic or as consistently linked to anticholinergic activity as dry mouth.

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