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 reported in patients who used these medicines daily, typically for at least a few months and often for years. Patients did not experience itching before starting the medicines. Reported cases were rare but sometimes serious, with patients experiencing widespread, severe itching that required medical intervention. As a result, we are revising the prescription cetirizine and levocetirizine prescribing information to include a new warning about this risk. We will subsequently request that manufacturers add a warning about pruritus to the Drug Facts Label of the OTC versions.
The FDA is adding a warning about the risk of pruritus after stopping long-term use of prescription cetirizine or levocetirizine to the prescribing information to increase awareness about this rare but serious reaction. The updated prescribing information also states that pruritus symptoms may improve with restarting the medicines. We will also request that manufacturers add a warning about pruritus to the Drug Facts Label of OTC cetirizine and levocetirizine.
Cetirizine and levocetirizine are antihistamines that block a molecule called histamine that the body releases during allergic reactions. Both medicines are approved to treat seasonal allergies, called seasonal allergic rhinitis, in adults and children 2 years and older. The medicines are also approved to treat year-round allergies, called perennial allergic rhinitis, and chronic hives, called chronic idiopathic urticaria, in patients 6 months and older.
Cetirizine was approved for oral use by prescription in December 1995 under the trade name Zyrtec (no longer sold as a prescription medicine) and approved for OTC use in November 2007. Levocetirizine was approved for oral use by prescription in May 2007 under the trade name Xyzal and approved for OTC use in January 2017.
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