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Botox is remarkably safe, especially considering it's a powerful toxin. Occasionally, a mild headache that lasts a few hours may occur after an injection in muscles of the forehead. Very rarely, though, that headache may become excruciating and can last as long as a month.
BOTOX works by temporarily relaxing overactive or spastic (contracting) muscles. BOTOX can also block signals to the sweat glands thus reducing excessive sweating (hyperhidrosis), and can also block the release of chemicals in the brain associated with the cause of pain (chronic migraine).