Can stopping Zyrtec or Xyzal after allergy season cause severe itching?
The FDA says rare but severe itching has been reported after stopping long-term daily cetirizine or levocetirizine, the drugs sold as Zyrtec, Xyzal, and many generics. Here is how to recognize the pattern, what it is not, and when to ask for medical help.
If you take Zyrtec or Xyzal every day during allergy season, it may feel natural to stop once the sneezing, runny nose, or itchy eyes calm down. But the FDA warns that some people have developed severe itching within days of stopping long-term daily use of these medicines.
The warning applies to oral cetirizine and oral levocetirizine, including brand-name Zyrtec and Xyzal and many generic products. The reaction appears to be rare, but it can be intense enough to affect sleep, work, and daily life.
What the FDA warning says
In a drug safety communication, the FDA said rare but severe itching, also called pruritus, has been reported after people stopped taking oral cetirizine or levocetirizine after long-term use. These medicines are sold both over the counter and by prescription.
According to the FDA, the reports generally involved people who had taken the medicine daily for at least several months, and often for years. The itching usually began within a few days after stopping. Many of the affected people did not have itching before they started the medicine.
The agency is requiring a warning in prescription labeling and said over-the-counter Drug Facts labels should also be updated. Federal consumer drug information pages were also revised in spring 2026 to make the warning easier for patients to find.
What this is — and what it is not
This warning describes a specific pattern: new, severe itching that begins soon after stopping long-term daily cetirizine or levocetirizine. That is different from ordinary seasonal allergy symptoms, which more often include sneezing, nasal congestion, a runny nose, and itchy or watery eyes.
It is also different from an emergency allergic reaction such as anaphylaxis. Seek urgent medical care right away for trouble breathing, wheezing, severe dizziness, fainting, swelling of the face, lips, tongue, or throat, or a rapidly spreading rash with whole-body symptoms.
And it is not the only possible cause of itching. Dry skin, eczema, hives, insect bites, medication reactions, liver or kidney disease, infections, and other conditions can also cause severe itching.
Why this matters during allergy season
Allergies are common in the United States, and many adults and children use antihistamines at some point each year. Cetirizine and levocetirizine are standard antihistamine medicines used for allergic rhinitis and hives, so many people may not think twice about starting and stopping them with the seasons.
For most people, occasional or short-term use is not the pattern the FDA is describing. The concern is mainly about long-term daily use, especially in people who take one of these medicines for chronic allergies or chronic hives and then stop when symptoms seem better.
Caregivers should also check ingredients carefully. A household may have brand-name products, store brands, or combination medicines that contain cetirizine or levocetirizine even if the front label does not say Zyrtec or Xyzal.
What researchers still do not know
The FDA warning is based on adverse-event reports and case review, which can identify a safety signal but cannot show exactly how often a side effect happens. Some cases are never reported, and reporting systems cannot prove cause and effect by themselves.
A 2026 clinical report indexed in PubMed adds context by describing new-onset itching after stopping cetirizine or levocetirizine, but it does not answer the biggest practical questions. It is still unclear why some people develop this reaction, who is most likely to get it, or whether tapering the medicine would reliably prevent it. The FDA also said effective treatments for this post-discontinuation itching have not been formally established.
What readers can do
- Check the active ingredient. Look for cetirizine or levocetirizine on the label, especially if you use a store-brand allergy medicine.
- Track the timing. If severe itching begins within a few days after stopping one of these medicines, note when you stopped, how long you had been taking it, and whether you had itching before.
- Ask before changing long-term daily use. If you have taken cetirizine or levocetirizine every day for months or longer, a clinician or pharmacist can help you think through next steps and alternatives.
- Do not brush off severe itching. Widespread, intense, or persistent itching deserves medical advice, especially if it disrupts sleep or daily activities.
- Report suspected side effects. Patients and clinicians can report suspected problems to the FDA MedWatch program, which helps regulators track rare safety issues.
The bottom line: Zyrtec, Xyzal, and their generics remain common allergy medicines, but people who use cetirizine or levocetirizine daily for long periods should know about this rare severe-itching warning. If symptoms start after stopping the drug, contact a healthcare professional. If you have breathing trouble, throat swelling, fainting, or other emergency symptoms, seek urgent care right away.
Sources
Editorial note: Weence articles are researched from cited public-health, medical, regulatory, journal, and reputable news sources and may be drafted with AI assistance. They are checked for source support, clarity, and safety guardrails before publication.
This article is for general informational purposes only and is not medical advice. Research findings can be early or incomplete, and health guidance can change. Always talk with a qualified healthcare professional about personal symptoms, diagnosis, medications, vaccines, screenings, or treatment decisions. If you think you may have a medical emergency, call emergency services right away.
