The FDA is warning that patients stopping the oral allergy medicines cetirizine (Zyrtec) or levocetirizine (Xyzal) after long-term use may experience rare but severe itching. These medicines are available in prescription and over-the-counter (OTC) forms. The itching, also called pruritus, has been...

http://www.fda.gov/safety/medical-product-safety-information/cetirizine-or-levocetirizine-drug-safety-communication-fda-warns-about-risk-severe-itching-after

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