What side effect?
Potential side effects of Botox
include mild facial asymmetry, heaviness of the brow and rare complications such as drooping of an eyelid.
Most asymmmetries can be corrected with a small amount of additional botox. Heaviness of the brow or drooping of an eyelid is usually a short-term problem, lasting only a couple of weeks. The effects of Botox are usually completely gone by 3 to 4 months.