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Side Effects of Botulinum Toxin Type A

While most people have no problems when taking botulinum toxin type A, side effects are possible. In clinical studies, commonly reported side effects included droopy eyelids, muscle weakness, and difficulty swallowing. These side effects are typically mild and easily treated. However, if you develop serious botulinum toxin type A side effects, such as chest pain, speech problems, or double vision, you should contact your healthcare provider immediately.

Side Effects of Botulinum Toxin Type A: An Introduction

In 2009, the generic name for Botox was changed from "botulinum toxin type A" to "onabotulinumtoxinA." This was done to prevent confusion between Botox® and Dysport® (abobotulinumtoxinA), a new botulinum toxin type A product.
We are no longer updating the information on botulinum toxin type A found in this article. Instead, you can click OnabotulinumtoxinA or AbobotulinumtoxinA to read up-to-date information on these medicines.


As with any medicine, side effects are possible with botulinum toxin type A (Botox®); however, not everyone who takes the drug will experience side effects. 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 easily treated by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with botulinum toxin type A. Your healthcare provider can discuss a more complete list of botulinum toxin type A side effects with you.)

Botulinum Toxin Type A (Botox Cosmetic)

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