Side Effects of OnabotulinumtoxinA

Although it is usually well tolerated, onabotulinumtoxinA may cause side effects in some people. In clinical studies, common side effects of the drug included headache, difficulty breathing, neck pain, and droopy eyelids. Be sure to tell your healthcare provider right away if you develop any serious problems while using this product, such as difficulty breathing, loss of bladder control, or signs of an allergic reaction.

OnabotulinumtoxinA Drug Information

An Introduction to OnabotulinumtoxinA Side Effects

As with any medicine, side effects are possible with onabotulinumtoxinA (Botox^®); however, not everyone who takes the drug will have problems. In fact, most people tolerate it quite well. If side effects do occur, in most cases, they are minor and either require no treatment or are treated easily by you or your healthcare provider.

(This article covers many, but not all, of the possible side effects with onabotulinumtoxinA. Your healthcare provider can discuss a more complete list with you.)

Serious Side Effects of OnabotulinumtoxinA

Some side effects of this product, while occurring infrequently, are potentially serious and should be reported to your healthcare provider right away. These include but are not limited to:

Signs of spreading of the toxin effect (a condition known as botulism), such as:
- Muscle weakness all over the body
- Double vision
- Blurred vision
- Droopy eyelids
- Voice changes
- Speech problems
- Loss of bladder control
- Difficulty breathing
- Difficulty swallowing

Signs of an allergic reaction, such as:
- An unexplained rash
- Hives
- Itching
- Swelling of the mouth or throat
- Wheezing
- Difficulty breathing.

(Side Effects of OnabotulinumtoxinA Continued: Page 2)