Itching is a sign that you may be having an allergic reaction to Percocet. The itching itself is not the problem the problem is that the itching could be a precursor to a serious possibly even life threatening allergic. You should immediately inform your doctor of this problem. You may be having a reaction to the acetaminophen in the drug.
Other allergic symptoms include swelling, trouble breathing, rash, tingling and numbness and dizziness.
You can find out more about Percocet at http://www.healthcentral.com/chronic-pain/find-drug-113368-73.html
A true allergy to an opioid is very rare. It is common, however, to itch when taking an opioid due to the histamine release. An over-the-counter antihistamine will usually take care of it. Sometimes after you've been taking the medication for awhile, the itching will go away on its own.
If the itching bothers you too much and an antihistamine doesn't help, you might talk with your doctor about switching you to an opioid in a different chemical class.
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