FDA approves Botox to treat chronic migraine

The U.S. Food and Drug Administration today (October 15) approved Botox injection (onabotulinumtoxinA) to prevent headaches in adult patients with chronic migraine. Chronic migraine is defined as having a history of migraine and experiencing a headache on most days of the month.

“Chronic migraine is one of the most disabling forms of headache,” said Russell Katz, M.D., director of the Division of Neurology Products in the FDA’s Center for Drug Evaluation and Research. “Patients with chronic migraine experience a headache more than 14 days of the month. This condition can greatly affect family, work, and social life, so it is important to have a variety of effective treatment options available.”

Migraine headaches are described as an intense pulsing or throbbing pain in one area of the head. The headaches are often accompanied by nausea, vomiting, and sensitivity to light and sound. Migraine is three times more common in women than in men. Migraine usually begins with intermittent headache attacks 14 days or fewer each month (episodic migraine), but some patients go on to develop the more disabling chronic migraine.

To treat chronic migraines, Botox is given approximately every 12 weeks as multiple injections around the head and neck to try to dull future headache symptoms. Botox has not been shown to work for the treatment of migraine headaches that occur 14 days or less per month, or for other forms of headache. It is important that patients discuss with their physician whether Botox is appropriate for them.

The most common adverse reactions reported by patients being treated for chronic migraine were neck pain and headache.

OnabotulinumtoxinA, marketed as Botox and Botox Cosmetic, has a boxed warning that says the effects of the botulinum toxin may spread from the area of injection to other areas of the body, causing symptoms similar to those of botulism. Those symptoms include swallowing and breathing difficulties that can be life-threatening. There has not been a confirmed serious case of spread of toxin effect when Botox has been used at the recommended dose to treat chronic migraine, severe underarm sweating, blepharospasm, or strabismus, or when Botox Cosmetic has been used at the recommended dose to improve frown lines.


Botox is manufactured by Allergan Inc. of Irvine, Calif.

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FDA Approves Botox to Treat Spasticity in Flexor Muscles of the Elbow, Wrist and Fingers

The U.S. Food and Drug Administration today approved Botox (onabotulinumtoxin A) to treat spasticity in the flexor muscles of the elbow, wrist, and fingers in adults. Spasticity is common after stroke, traumatic brain injury, or the progression of multiple sclerosis.

“Muscles affected by spasticity have increased stiffness and tightness, which may lead to pain, difficulties with hygiene and other activities of daily living, and may affect how a patient looks,” said Russell Katz, M.D., director of the Division of Neurology Products in the FDA’s Center for Drug Evaluation and Research. “In clinical trials, treatment with Botox was found to be beneficial to patients with upper limb spasticity.”

Botox works by temporarily blocking the connections between nerves and muscles, resulting in a temporary paralysis of the spastic muscle.

Botox has a Boxed Warning that says the effects of the botulinum toxin may spread from the area of injection to other areas of the body, causing symptoms similar to those of botulism. Those symptoms include swallowing and breathing difficulties that can be life-threatening.

The most common adverse reactions reported by patients with upper limb spasticity were nausea, fatigue, bronchitis, muscle weakness, and pain in the arms.

Botox has not been shown to be safe and effective treatment for other upper limb muscles, spasticity in the legs, or for treatment of fixed contracture – a condition that affects range of motion. Treatment with Botox is not intended to substitute for physical therapy or other rehabilitative care.

Botox is manufactured by Allergan Inc. of Irvine, Calif.

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FDA Gives Update on Botulinum Toxin Safety Warnings; Established Names of Drugs Changed

The U.S. Food and Drug Administration today announced an update to a previous safety alert on four botulinum toxin drug products, noting that all of them now have boxed warnings on their labels and have developed Medication Guides for patients, as directed by the agency in April 2009.

The boxed warning cautions that the effects of the botulinum toxin may spread from the area of injection to other areas of the body, causing symptoms similar to those of botulism. Those symptoms include potentially life-threatening swallowing and breathing difficulties and even death.

These symptoms have mostly been reported in children with cerebral palsy being treated with botulinum toxin for muscle spasticity, a use of the drugs that has not been approved by FDA. Symptoms have also been reported in adults treated both for approved and unapproved uses.

The affected products are:
- Botox (new established name: onabotulinumtoxinA)
- Botox Cosmetic (new established name: onabotulinumtoxinA)
- Myobloc (new established name: rimabotulinumtoxinB)
- Dysport (abobotulinumtoxinA) was approved in April 2009 with the boxed warning and is not making any name or label changes at this time.

No definitive serious adverse event reports of distant spread of toxin effect have been associated with dermatologic use of Botox/Botox Cosmetic at the recommended doses (for frown lines between the eyebrows or severe underarm sweating). As well, no definitive serious adverse event reports of distant spread of toxin effect have been associated with Botox when used at approved doses for eyelid twitches or for crossed eyes.

The revised labels also emphasize that the different botulinum toxin products are not interchangeable, because the units used to measure the products are different. To help reduce the potential for dosing errors, the botulinum toxin products have changed their established drug names (often referred to as the drug’s “generic” name). Neither the brand names nor the formulations of the products have changed.

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