May cause drowsiness and/or blurred vision. Diarrhea may be sign of incomplete intestinal obstruction. Heat prostration may occur in increased environmental temperature (use caution in hot weather and/or exercise). Use with caution in coronary artery disease, tachyarrhythmias, heart failure, or hypertension. Use with caution in the following cases: endocrine diseases, GI infections, hepatic impairment, hiatal hernia with reflux esophagitis, hyperthyroidism, autonomic neuropathy, and renal impairment. Use with caution in the elderly (increased risk for anticholinergic effects, confusion, and hallucinations).