Botox stays only where injected, it does not roam through the body. "If I inject it in your face, it's not going to work [or show up in] your toe," says Rowe. "It does not have a systemic effect." However, it may migrate up to 3 cm from where it was injected. But even if some molecules were to go into the bloodstream and travel to distant sites in the body, the cosmetic doses (typically less than 100 units) used are significantly lower than the toxic dose that would be harmful systemically (2,500-3,000 units).
In 1998, David E.I. Pyott became CEO of Allergan. He was enthusiastic about Botox's wrinkle-reducing potential, he says, and pushed the company to conduct a series of studies on the matter. In 2002, Botox earned FDA approval for so-called frown lines--wrinkles between eyebrows--marking the first time a pharmaceutical drug was given the green light for a strictly cosmetic purpose. In 2001, the year before Botox was approved for wrinkles, it generated about $310 million in sales. By 2013, the year it was approved for overactive bladder, Allergan reported nearly $2 billion in revenue from Botox.

Botox is a neurotoxin derived from the bacterium Clostridium botulinum. Ingested in contaminated food, it can interfere with key muscles in the body, causing paralysis and even death. But when injected in tiny doses into targeted areas, it can block signals between nerves and muscles, causing the muscles to relax. That's how it smooths wrinkles: when you immobilize the muscles that surround fine lines, those lines are less likely to move--making them less noticeable. It's also why it's FDA-approved to treat an overactive bladder: Botox can prevent involuntary muscle contractions that can cause people to feel like they have to pee even when they don't.
Simply put, "Baby Botox" uses a lower volume of Botox (a.k.a. botulinum toxin injections) than a traditional injection to smooth fine lines and wrinkles. "Instead of using 25 units in an area, you may use 10 units," Melissa Doft, a board-certified plastic surgeon in New York City, tells Allure. "I have many patients who ask for half the normal dose, as they do not want to look frozen but are tired of wrinkles in photos. First-time Botox patients are perfect for this."
In a double-blind study of 123 adults with regular, chronic migraine, the adults receiving botulinum toxin type A experienced fewer migraine attacks each month. In addition, attacks they did experience were less intense, of shorter duration, and required less treatment than adults who did not receive Botox injections for migraine. These injections were also well-tolerated in adults experiencing migraine with and without aura.
Other than that, there don’t seem to be any specific groups of people or health conditions that are contraindicated for Botox injections. As with all treatments, general health guidelines apply. People with a healthy body-mass index who are non-smokers, moderate or non-drinkers, and physically active will nearly always tolerate any type of medical treatment well.
Other things to know about Botox treatments: Some providers charge a consultation fee, which is waived if you choose to proceed with the injections but charged if you decline. Also, who is doing the injection? Make sure it’s a trained, certified professional. As in many other things, training and credentials are important. In some practices, a junior employee may perform the procedure for a lesser rate. Make sure that’s what you want.
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Two double-blind, placebo-controlled, randomized, multi-center, 24-week clinical studies were conducted in patients with OAB with symptoms of urge urinary incontinence, urgency, and frequency (Studies OAB -1 and OAB-2). Patients needed to have at least 3 urinary urgency incontinence episodes and at least 24 micturitions in 3 days to enter the studies. A total of 1105 patients, whose symptoms had not been adequately managed with anticholinergic therapy (inadequate response or intolerable side effects), were randomized to receive either 100 Units of BOTOX (n=557), or placebo (n=548). Patients received 20 injections of study drug (5 units of BOTOX or placebo) spaced approximately 1 cm apart into the detrusor muscle.

Tell your doctor about all your medical conditions, including: plans to have surgery; had surgery on your face; have trouble raising your eyebrows; drooping eyelids; any other abnormal facial change; are pregnant or plan to become pregnant (it is not known if BOTOX® Cosmetic can harm your unborn baby); are breast-feeding or plan to (it is not known if BOTOX® Cosmetic passes into breast milk).
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