Botox for chronic migraine prevention is given as 155 units across 31 injection sites in seven muscle areas, including your forehead, temples, behind your ears, and the back of your neck and shoulders ...

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, ...