People that receive Botox injections often wonder how long the treatments will last. Dr. Lyle Weeks, an El Paso plastic surgeon, answers this on his website. He says, "It lasts about 4 months, after which lines gradually revert to their pre-treatment appearance." He then goes on to discuss more about botox injections. He explains is not a candidate for botox injections. These include pregnant or nursing women as well as women that are trying to become pregnant. He also says that there are patients with certain neurological disorders who have an increased risk of serious side effects.