yielding a permanent effect. If binocular vision is good, the brain mechanism of motor fusion, which aligns the eyes on a target visible to both, can stabilize the corrected alignment. In January 2014, botulinum toxin was approved by UK's Medicines and Healthcare products Regulatory Agency for treatment of restricted ankle motion due to lower-limb spasticity associated with stroke in adults. In July 2016, the U.S. Food and Drug Administration (FDA) approved abobotulinumtoxinA (Dysport) for injection for the treatment of lower-limb spasticity in pediatric patients two years of age and older. AbobotulinumtoxinA is the first and only FDA-approved botulinum toxin for the treatment of pediatric lower limb spasticity. In the U.S., the FDA approves the text of the labels of prescription medicines and for which medical conditions the drug manufacturer may sell the drug. However, prescribers may freely prescribe them for any condition they wish, also known as off-label use. Botulinum toxins have been used off-label for several pediatric conditions, including infantile esotropia. Excessive sweating AbobotulinumtoxinA has been approved for the treatment of excessive underarm sweating of unknown cause, which cannot be managed by topical agents. Migraine In 2010, the FDA approved intramuscular botulinum toxin injections for prophylactic treatment of chronic migraine headache. Cosmetic Indications In cosmetic applications, botulinum toxin is considered relatively safe and effective for reduction of facial wrinkles, especially in the uppermost third of the face. Commercial forms are marketed under the brand names Botox Cosmetic/Vistabel from Allergan, Dysport/Azzalure from Galderma and Ipsen, Xeomin/Bocouture from Merz, Jeuveau/Nuceiva from Evolus, manufactured by Daewoong in South Korea. The effects of botulinum toxin injections for glabellar lines ('11's lines' between the eyes) typically last two to four months and in some cases, product-dependent, with some patients experiencing a longer duration of effect of up to 6 months or longer. Injection of botulinum toxin into the muscles under facial wrinkles causes relaxation of those muscles, resulting in the smoothing of the overlying skin. Smoothing of wrinkles is usually visible three to five days after injection, with maximum effect typically a week following injection. Muscles can be treated repeatedly to maintain the smoothed appearance. DaxibotulinumtoxinA (Daxxify) is used for the temporary improvement in the appearance of moderate to severe glabellar lines (eyebrows). DaxibotulinumtoxinA is an acetylcholine release inhibitor and neuromuscular blocking agent. Other Botulinum toxin is also used to treat disorders of hyperactive nerves including excessive sweating, neuropathic pain, and some allergy symptoms.