Botox (onabotulinumtoxinA) is a prescription drug that’s used to treat a variety of medical conditions. Botox comes as a powder that’s mixed with liquid to form a solution, which is injected. Note: ...

Botox can cause temporary redness, swelling, tenderness, or bruising at the injection site. You may get flu-like symptoms like fever, body aches, or nausea after Botox. Botox may cause headaches, ...