Botulinum toxin is made from a type of bacteria. It is a toxin that affects nerves. An injection puts this toxin into muscle. There, it blocks the release of the chemical signal from the nerves to muscles. This will decrease the muscle contraction.
Botulinum toxin is used for cosmetic and medical reasons.
The injection process is often called
botox injection, although any brand of the botulinum toxin may be used.
The injection is FDA-approved to treat:
The injection has also been used to treat other conditions, such as:
- Tension headaches
—spasm of esophageal muscles causing difficulties in swallowing
- Spasmodic dysphonia
Muscle spasms due to
- Spasticity associated with multiple sclerosis
- Spasticity in leg and arm muscles due to brain injury/stroke
- Focal limb dystonias
- Incontinence due to bladder problems
- Anal sphincter disorders
- Peripheral nerve pain
- Temporomandibular disorder
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Complications are rare. When they occur, they are temporary and mild. Side effects are related to the site of injection. For example, if injections take place near the eyes, there may be complications with the eyelids or brow line.
Temporary issues may include:
- Stinging around the injection sites
The following are less common reactions. They are generally mild and do not last long.
Other complications that may occur include:
- Excessive weakness of the muscle around the eyes—can cause drooping of the eyelids or obstruction of vision
- Difficulty swallowing—can occur in patients receiving injections in their neck
- Compensatory hyperhidrosis—people being treated for hyperhidrosis may develop increased sweat production at another area of the body
- Excessive weakness or wasting in certain muscles—the injection may slow any improvement in the muscle
- Neck weakness in people with long, thin necks
Risk of the botulinum toxin spreading beyond the injection area—may cause botulism symptoms, including difficulty breathing and death in severe cases. Children with
may be at a higher risk for this side effect.
This procedure may worsen nerve or muscle disorders, such as:
The toxin can also interact with medications such as antibiotics. Tell your doctor about all of the medications that you are taking.
You should not have botox if you:
- Have an infection or inflammation in the area where botox will be injected
- Are sensitive to the ingredients in botox
- Are pregnant or breastfeeding
Most often, none is given. Some patients may prefer to have the area numbed for comfort. In this case, a topical anesthetic may be used.
A thin needle will be used. The toxin will be injected through the skin into the targeted muscle. You will often need several injections in a small area.
- Remain upright for several hours
- Avoid alcohol
The time needed will depend on the number of sites involved. It is often less than 20 minutes.
You may have some minimal discomfort.
Normal activities may be resumed after the procedure. To promote recovery, follow your doctor's
The toxin temporarily weakens targeted muscles. The treatment lasts up to four months. With repeated use, the effects may last longer.
Contact your doctor if any of the following occurs:
- Difficulty breathing
- Difficulty swallowing
- Difficulty speaking
- Severe lower eyelid droop or obstructed vision
- Excessive weakness around the injection site
- Rash or any other sign of an allergic reaction
In case of an emergency, call for medical help right away.
Allergan Physician Production Information. Botox cosmetic (botulinum toxin type A). Published April 2008.
FDA approves Botox to treat chronic migraines. US Food & Drug Administration website. Available at: http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm229782.htm. Published October 15, 2010. Accessed February 12, 2014.
Ondo WG, Gollomp S, Galvez-Jimenez N. A pilot study of botulinum toxin A for headache in cervical dystonia.
Ward A, Roberts G, Warner J, et al. Cost-effectiveness of botulinum toxin type A in the treatment of post-stroke spasticity.
J Rehabil Med. 2005;37(4):252-257.
11/4/2009 DynaMed Systematic Literature Surveillance
http://www.ebscohost.com/dynamed: FDA gives update on botulinum toxin safety warnings. US Food and Drug Administration website. Available at:
http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm175013.htm. Updated August 3, 2009. Accessed November 4, 2009.
3/19/2010 DynaMed Systematic Literature Surveillance
http://www.ebscohost.com/dynamed: FDA approves Botox to treat spasticity in flexor muscles of the elbow, wrist and fingers. US Food and Drug Administration website. Available at:
http://www.fda.gov/NewsEvents/Newsroom/PressAnnouncements/ucm203776.htm. Updated March 9, 2010. Accessed March 19, 2010.
5/17/2012 DynaMed's Systematic Literature Surveillance
http://www.ebscohost.com/dynamed: Jackson JL, Kuriyama A, Hayashino Y. Botulinum toxin A for prophylactic treatment of migraine and tension headaches in adults: a meta-analysis.
Last reviewed February 2014 by Rimas Lukas, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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