Botox is made from the bacteria that causes botulism. Botox blocks nerve activity in the muscles, causing a temporary reduction in muscle activity. Botox is used to treat cervical dystonia (severe spasms in the neck muscles), or severe underarm sweating (hyperhidrosis).

Botox is also used to treat certain eye muscle conditions caused by nerve disorders. This includes uncontrolled blinking or spasm of the eyelids, and a condition in which the eyes do not point in the same direction. Botulinum toxin type A is also used to temporarily lessen the appearance of facial wrinkles. Botox may also be used for other purposes not listed in this medication guide.

Botox is a toxin produced by Clostridium botulinum bacteria. The drug works by decreasing nerve signals to muscles, which helps them to relax. Botox enters nerve cells and inhibits the release of acetylcholine, a chemical that transmits signals from nerve to nerve. The actions of the drug are not permanent, and the muscle will eventually recover and return to its previous state.

For severe sweating, Botox works similarly, blocking the release of acetylcholine from the nerve cells that stimulate the sweat glands.

Side Effects of Botox: muscle weakness near where the medicine was injected; bruising, bleeding, pain, or tenderness where the injection was given; headache, muscle stiffness, neck or back pain; fever, cough, sore throat, runny nose, nausea, flu symptoms, dizziness, drowsiness, anxiety; dry mouth, dry eyes; increased sweating in areas other than the underarms; itchy or watery eyes, increased sensitivity to light; or eyelid swelling or bruising.