Side Effects

See also Warning section.

Because this medication is given at the site of your condition, most of the side effects occur close to where the medication is injected. Redness, bruising, infection, and pain at the injection site may occur.

Dizziness, mild difficulty swallowing, respiratory infections such as cold or flu, pain, nausea, headache, and muscle weakness may occur when this medication is used to relax muscles. Double vision, drooping or swollen eyelid, eye irritation, dry eyes, tearing, reduced blinking, and increased sensitivity to light may also occur.

If any of these effects persist or worsen, notify your doctor or pharmacist promptly. You may require protective eye drops/ointments, an eye patch, or other treatment.

When this medication is used to prevent migraines, side effects such as headache, neck pain, and drooping eyelid may occur.

When this medication is used for excessive sweating, side effects such as non-underarm sweating, respiratory infections such as cold or flu, headache, fever, neck or back pain, and anxiety may occur.

When this medication is used for overactive bladder, side effects such as urinary tract infections, burning/painful urination, fever, or difficulty urinating may occur.

If any of these effects persist or worsen, notify your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: itching/swelling (especially of the face/tongue/throat), rash, severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.