Nonanticholinergic antihistamines should be considered first when treating allergic reactions (Beers Criteria)
Advanced age is associated with reduced clearance and greater risk of confusion, dry mouth, constipation, and other anticholinergic effects and toxicity; use lower end of dosage range (4 mg PO q12hr) for elderly patients, or administer less frequently
Renal impairment: Elimination is reduced in renal insufficiency; administer lower doses, and monitor closely
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