Botulinum toxin is used for a number of medical problems. When injected in small amounts, it can effectively weaken a muscle for a period of three to four months. It is used in the treatment of spasms and dystonias.
The conditions approved for treatment with botulinum toxin include:
Cervical dystonia (spasmodic torticollis), a neuromuscular disorder of the head and neck, which makes someone involuntarily jolt their head to one side; blepharospasm, uncontrolled muscle contraction or twitch of the eyelid; severe primary axillary hyperhidrosis, a condition of excessive sweating; chronic migraine, defined by patient history and high frequency of occurrence; strabismus, improper alignment of the eyes (heterotropia; colloquially “crossed eyes”).
In cosmetic applications, injection of botulinum toxin can be used to prevent development of wrinkles by paralyzing facial muscles. Following treatment, results are usually seen within 3–5 days; however, it can take up to 2 weeks to see full results.