Zyrtec vs Claritin
Both are antihistamines. Here is how Zyrtec and Claritin compare on class, mechanism, dosing, approval and supply.
At a glance
Key differences
- Same class. Both Zyrtec and Claritin are antihistamines, so they work through the same broad mechanism. Differences between them tend to be about dosing, route, how selective they are, and side effects rather than what they target.
- Time on the market. Zyrtec was first approved by the FDA in 1995, Claritin in 1993. That gives Claritin roughly 2 more years of real-world use and long-term safety data.
- Who markets them. Zyrtec is marketed by Kenvue; Claritin by Bayer.
- Same drug, more than one brand. Cetirizine is sold as Zyrtec / Reactine — the same active ingredient marketed under different brand names, typically for different approved uses or doses.
What each one treats
An oral daily allergy medication used to relieve hay fever and hive symptoms.
temporarily relieves these symptoms due to hay fever or other upper respiratory allergies: runny nose sneezing itchy, watery eyes itching of the nose or throat
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Which medicine is right for a given person depends on their diagnosis, other conditions, other medicines, kidney and liver function, pregnancy, and cost or reimbursement — none of which this page knows. Two drugs in the same class are not automatically interchangeable. Never start, stop or switch a prescription medicine on the basis of a web page; that decision belongs to you and your clinician or pharmacist.
How this page is built
The facts on this page are pulled directly from official U.S. FDA datasets — they are not written from memory. Each field below names the dataset it came from, so you can check it yourself.
- FDA Drug Label (openFDA) ↗ Indications, mechanism of action and pharmacologic class
- Drugs@FDA ↗ First FDA approval date and the company holding the application
- FDA Drug Shortage Database ↗ Current US supply / shortage status
Plain-English summaries and drug-class explainers are written and reviewed by Sreepriya Prasannan (MSc Digital Transformation of Life Sciences (Innopharma Education / Griffith College); MSc & BSc Botany). Data is retrieved automatically from the sources above and cross-checked with AI-assisted verification (Anthropic's Claude) — brand and generic names are matched against the exact FDA product record so that a combination product or a different formulation cannot be mistaken for the drug on this page. An editor reviews the result before publication. We describe this in full in our editorial standards and corrections policy. The FDA data on this page was last retrieved on 8 Oct 2026. How every register is built: methodology · fixes we have made: corrections log.