Botox injections work by weakening or paralyzing muscles, says MedlinePlus. Common side effects include pain, swelling or bruising at the injection site.
Depending on the condition being treated, the effects of Botox can last from three to 12 months.
Doctors often use Botox in small doses to treat:
- Facial wrinkles.
- Underarm sweating.
- Abdominal muscle spasms.
- Chronic migraine.
- Overactive bladder.