SN instructed patient / caregiver on the medication Oxybutynin. This medication is used to treat overactive bladder a condition in which the bladder muscles contract uncontrollably ( spasms ) and cause frequent urination, an urgent need to urinate, and / or the inability to control urination. Oxybutynin is in a class of medications called anticholinergics. It works by relaxing the bladder muscles. Possible side effects included: Dry mouth or eyes ( less common - dry nose or skin ), dizziness and / or drowsiness, mild constipation, upset stomach, heartburn, nausea, blurred vision or ( eye ) sensitivity to light. Patient / caregiver verbalized understanding.