The results usually start to be noticed within three to 10 days or even sooner. They tend to last in most people for up to three or four months. As time passes, the muscle activity will gradually return to normal. Additionally, other areas may return to activity over time, depending on the amount injected. The interesting thing about Botox is that it tends to work fairly well even up to the third month, as a procedure that might last a very short time at full strength and then go away quickly (filler injections such as Restylane, Perlane, or Juvederm tend to last approximately six to 12 months, depending on the amount used).
Botulinum toxin is used to treat certain eye disorders such as crossed eyes (strabismus) and uncontrolled blinking (blepharospasm), to treat muscle stiffness/spasms or movement disorders (such as cervical dystonia, torticollis), and to reduce the cosmetic appearance of wrinkles. It is also used to prevent headaches in people with very frequent migraines. Botulinum toxin relaxes muscle by blocking the release of a chemical called acetylcholine.
Botox is so commonplace these days that you can get it done at some gyms and spas, but in these cases, you never know what you’re getting, how old the product is, with what it's mixed, and whether the injector knows what he or she is doing. Dr. Matarasso suggests only getting it done by what he calls the “core four”: a board-certified physician who is either a dermatologist, a plastic surgeon, an ear-nose-and-throat doctor, or an ophthalmologist.
It will not affect the nerves that cause sensation, or make you feel numb. When it is used correctly, it can lift the brow to give an appealing and sincere look. "But if too much is injected in the danger zone—the horizontal lines in the forehead—you can look Spocked, as in Spock from Star Trek," says Jean Carruthers, a Vancouver eye surgeon who, with her husband, Alastair, coauthored the first paper on the cosmetic benefits of Botox in 1989. That's why it's important to be treated by an experienced doctor who can judge the size of your muscles and how much Botox you will need.
Do not receive BOTOX® Cosmetic if you: are allergic to any of the ingredients in BOTOX® Cosmetic (see Medication Guide for ingredients); had an allergic reaction to any other botulinum toxin product such as Myobloc® (rimabotulinumtoxinB), Dysport® (abobotulinumtoxinA), or Xeomin® (incobotulinumtoxinA); have a skin infection at the planned injection site.