A Lidoderm patch is a topical anesthetic that works by stopping nerves from transmitting pain signals to the brain, according to Drugs.com. This medication relieves pain associated with herpes zoster, also known as shingles.
Individuals should use a Lidoderm patch only as directed by a doctor, Drugs.com explains. The patch is applied to an area of pain after removing the patch liner and should only be applied to intact, clean and dry skin and never to broken, damaged or inflamed skin. It's important to wash hands before and after applying the patch. It can be worn for up to 12 hours.
Side effects of a Lidoderm patch include irritation, redness or swelling at the site of application, reports RxList. Individuals using the patch should seek emergency medical attention if signs of an allergic reaction occur, including hives, difficulty breathing, or swelling of the face, tongue or throat. Serious side effects include uneven heartbeat, blurred vision, seizure, confusion and drowsiness. Use of the medication should be stopped and a doctor informed if serious side effects occur.
Before using a Lidoderm patch, individuals should inform their doctors of pregnancy status, all allergies and all other medications, instructs Drugs.com. Patients should also advise their doctors of heart, liver or kidney problems before using this medication. Physicians should be aware of allergic reactions to any anesthetic that have occurred in the past.