Is It Safe?
Botox does have its side effects: headache, respiratory infection, flu symptoms, droopy eyelids, and nausea. In some patients (less than 3%) there may be severe reactions such as pain in the face, redness at the injection site, and muscle weakness. Symptoms are usually temporary but could last several months.
Nonetheless, Allergan says that Botox has a long-term safety profile, given that it has been around for 13 years.
The three experts in this article that have used Botox in their practice or research -- Greenberg, Gold, and Silberstein -- also say that the drug is safe when used in an appropriate manner.