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FDA News

FOR IMMEDIATE RELEASE
January 16, 2009

Media Inquiries:
Rita Chappelle, 301-796-4672
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FDA Alerts Public about Danger of Skin Numbing Products
Serious and life-threatening risks associated with improper use

The U.S. Food and Drug Administration today issued a Public Health Advisory to alert consumers, patients, health care professionals, and caregivers about potentially serious and life-threatening side effects from the improper use of skin numbing products. The products, also known as topical anesthetics, are available in over-the-counter (OTC) and prescription forms. 

Skin numbing products are used to desensitize nerve endings that lie near the surface of the skin, causing a numbness of the skin. These topical anesthetics contain anesthetic drugs such as lidocaine, tetracaine, benzocaine, and prilocaine in a cream, ointment, or gel. When applied to the skin surface, they can be absorbed into the blood stream and, if used improperly, may cause life-threatening side effects, such as irregular heartbeat, seizures, breathing difficulties, coma, or even death. FDA has received reports of adverse events and deaths of two women who used topical anesthetics before laser hair removal.  In February 2007, the FDA issued a Public Health Advisory - “Life-Threatening Side Effects with the Use of Skin Products containing Numbing Ingredients for Cosmetic Procedures,” to warn consumers about these products.

Patients for whom an over-the-counter or prescription topical anesthetic is recommended should consider using a topical anesthetic that contains the lowest amount possible of medication that will relieve your pain. Also, health care professionals should determine whether adequate pain relief can be safely achieved with a topical anesthetic, or whether a different treatment would be more appropriate.

The FDA strongly advises consumers not to:

When skin temperature increases, the amount of anesthetic reaching the blood stream is unpredictable and the risk of life-threatening side effects increases with greater amounts of lidocaine in the blood.

A recently published study in Radiology looked at women taking acetaminophen and ibuprofen by mouth versus applying lidocaine gel, a topical anesthetic, to the skin to decrease discomfort during mammography. The lidocaine gel was applied to a wide skin surface area and then covered with plastic wrap. There were no serious or life-threatening side effects reported in the study, nor were any reported when FDA discussed the results with the doctor who performed the study. The study results favored the use of lidocaine as there was significantly less discomfort than with the plain gel or oral acetaminophen or ibuprofen.  However, given the life-threatening side effects associated with the use of topical anesthetics during laser hair removal, FDA is concerned that similar side effects could occur when topical anesthetics are used during mammography. Further, the study was small and it is possible that a larger study might show different findings.
Patients should talk with their health care professional if they are considering using a topical anesthetic before a mammogram. The following summarizes advice for patients if a topical anesthetic is recommended for their use:

Consumers and health care professionals may report adverse events to the FDA's MedWatch program at 800-FDA-1088, by mail at MedWatch, HF-2, FDA, 5600 Fishers Lane, Rockville, Md 20852-9787, or online at www.fda.gov/medwatch/report.htm.
To read the FDA’s 2009 Public Health Advisory, go to:  http://www.fda.gov/cder/drug/advisory/topical_anesthetics2009.htm

To read the FDA’s 2007 Public Health Advisory, go to:  http://www.fda.gov/cder/drug/advisory/topical_anesthetics.htm

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