Oxybutynin

IMPORTANT SAFETY INFORMATION

Oxybutynin is indicated for the relief of symptoms of bladder instability associated with voiding in patients with uninhibited neurogenic or reflex neurogenic bladder (i.e., urgency, frequency, urinary leakage, urge incontinence, dysuria).

Dosage and Administration

Oxybutynin chloride extended-release tablets must be swallowed whole with the aid of liquids, and must not be chewed, divided, or crushed.

Oxybutynin chloride extended-release tablets may be administered with or without food.

Adults
The recommended starting dose of oxybutynin chloride extended-release tablet is 5 mg or 10 mg once daily at approximately the same time each day. Dosage may be adjusted in 5-mg increments to achieve a balance of efficacy and tolerability (up to a maximum of 30 mg/day). In general, dosage adjustment may proceed at approximately weekly intervals.

Pediatric Patients Aged 6 Years of Age and Older
The recommended starting dose of oxybutynin chloride extended-release tablet is 5 mg once daily at approximately the same time each day. Dosage may be adjusted in 5-mg increments to achieve a balance of efficacy and tolerability (up to a maximum of 20 mg/day).

Contraindications
Oxybutynin chloride extended-release tablets are contraindicated in patients with urinary retention, gastric retention and other severe decreased gastrointestinal motility conditions, uncontrolled narrow-angle glaucoma.

Oxybutynin chloride extended-release tablets are also contraindicated in patients who have demonstrated hypersensitivity to the drug substance or other components of the product. There have been reports of hypersensitivity reactions, including anaphylaxis and angioedema.

Warnings and Precautions

Angioedema
Angioedema of the face, lips, tongue and/or larynx has been reported with oxybutynin. In some cases, angioedema occurred after the first dose. Angioedema associated with upper airway swelling may be life-threatening. If involvement of the tongue, hypopharynx, or larynx occurs, oxybutynin should be promptly discontinued and appropriate therapy and/or measures necessary to ensure a patent airway should be promptly provided.

Central Nervous System Effects
Oxybutynin is associated with anticholinergic central nervous system (CNS) effects. A variety of CNS anticholinergic effects have been reported, including hallucinations, agitation, confusion and somnolence. Patients should be monitored for signs of anticholinergic CNS effects, particularly in the first few months after beginning treatment or increasing the dose. Advise patients not to drive or operate heavy machinery until they know how oxybutynin chloride extended-release tablets affect them. If a patient experiences anticholinergic CNS effects, dose reduction or drug discontinuation should be considered.

Oxybutynin chloride extended-release tablets should be used with caution in patients with preexisting dementia treated with cholinesterase inhibitors due to the risk of aggravation of symptoms.
Oxybutynin chloride extended-release tablets should be used with caution in patients with Parkinson’s disease due to the risk of aggravation of symptoms.
Worsening of Symptoms of Myasthenia Gravis
Oxybutynin chloride extended-release tablets should be used with caution in patients with myasthenia gravis due to the risk of aggravation of symptoms.

Worsening of Symptoms of Decreased Gastrointestinal Motility in Patients with Autonomic Neuropathy
Oxybutynin chloride extended-release tablets should be used with caution in patients with autonomic neuropathy due to the risk of aggravation of symptoms of decreased gastrointestinal motility.

Urinary Retention
Oxybutynin chloride extended-release tablets should be administered with caution to patients with clinically significant bladder outflow obstruction because of the risk of urinary retention

Gastrointestinal Adverse Reactions
Oxybutynin chloride extended-release tablets should be administered with caution to patients with gastrointestinal obstructive disorders because of the risk of gastric retention.

Oxybutynin chloride extended-release tablets, like other anticholinergic drugs, may decrease gastrointestinal motility and should be used with caution in patients with conditions such as ulcerative colitis and intestinal atony.
Oxybutynin chloride extended-release tablets should be used with caution in patients who have gastroesophageal reflux and/or who are concurrently taking drugs (such as bisphosphonates) that can cause or exacerbate esophagitis.
As with any other nondeformable material, caution should be used when administering Oxybutynin chloride extended-release tablets to patients with preexisting severe gastrointestinal narrowing (pathologic or iatrogenic). There have been rare reports of obstructive symptoms in patients with known strictures in association with the ingestion of other drugs in nondeformable controlled-release formulations.

Common Side Effects

• Dry mouth
• Constipation
• Sleepiness
• Nausea
• Weakness or lack of energy
• Dizziness
• Headache
• Blurred vision
• Dry eyes
• Diarrhea
• Nausea
• Pain
• Runny or stuffy nose

Less Common Side Effects

• Loss of appetite
• Fluid retention
• Hot flush
• Difficulty speaking
• Difficulty swallowing
• Frequent bowel movements
• Chest discomfort
• Thirst

Other Side Effects Include

• Inability to focus the eye
• Impairment of mental alertness
• Memory impairment
• Dilated pupils
• Fast heart rate
• QT prolongation
• Hallucinations
• Confusion
• Urinary tract infection
• Palpitations
• Nasal congestion
• High blood pressure (hypertension)

Tell your healthcare provider if you have any side effect that bothers you or does not go away. These are not all the possible side effects of sildenafil tablets. For more information, ask your healthcare provider or pharmacist. Call your doctor for medical advice about side effects.

You may report side effects via the FDA MedWatch Program at www.fda.gov/medwatch or 1-800-FDA-1088.

Please read the Patient Information in the accompanying full Prescribing Information.