The effects from Botox will last four to six months. As muscle action gradually returns, the lines and wrinkles begin to re-appear and wrinkles need to be re-treated. The lines and wrinkles often appear less severe with time because the muscles are being trained to relax.
Temporary bruising is the most common side effect. Headaches, which resolve in 24-48 hours, can occur, but this is rare. A small percentage of patients may develop eyelid drooping. This usually resolves in three weeks. This development is usually caused by migration of the Botox and for this reason, you shouldn't rub the treated area for 12 hours after injection or lay down for three to four hours. There have been no allergies associated with Botox to date.