Oxybutynin may delay passage of potassium tablets through the digestive system and result in ulceration or narrowing of the small intestine.
PREGNANCY: Studies of oxybutynin in pregnant rabbits, rats, and mice have not produced any evidence of harm in the fetus; however, since no controlled studies have been done in pregnant women, the potential benefit of this medicine needs to be weighed against any theoretical harm.
NURSING MOTHERS: It is not known if oxybutynin is excreted in human milk.
SIDE EFFECTS: The most common side effects of oxybutynin are dry mouth, constipation, tiredness, and headache. About 1 in every 14 patients taking oxybutynin tablets cannot tolerate it because of side effects. Diarrhea, urinary tract infections, blurred vision, and difficulty urinating also may occur. The transdermal patch or gel may also cause local reactions at the application sites such as itching and rash. Transdermal patches or gel cause fewer side effects than the tablets. Serious hypersensitivity reactions involving swelling of the throat, lips, and tongue also may occur.
Reference: FDA Prescribing Information
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