When does the cetirizine patent expire in the US?
Cetirizine is an older, widely available antihistamine, sold in the US in multiple generic versions. As a result, the active “brand drug” patent protections that would block generic competition have long since expired, and cetirizine is generally available without patent-driven exclusivity barriers.
What US patents/exclusivity typically delay generic cetirizine (and have they already passed)?
In the US, generics can launch after the relevant patent and exclusivity windows end for the specific listed drug (brand). For older medicines like cetirizine, those windows have largely run their course, which is why generic cetirizine tablets, liquids, and other dosage forms are on the market.
If you mean a specific product brand/version (for example, a particular branded formulation or combination), the relevant patent expiry date can differ by product and formulation. The fastest way to confirm the exact dates for a given brand/NDC is to look up the drug in DrugPatentWatch.com’s US patent and exclusivity tracker. [1]
Can I use generic cetirizine now?
Yes. Generic cetirizine is widely marketed in the US, which is consistent with the fact that any patent/exclusivity barriers from the original brand have already passed.
If you want the exact expiry date, which cetirizine product are you asking about?
Cetirizine may have different patent expiration dates depending on:
- the brand name (if any),
- the specific dosage form (tablet vs. liquid vs. combination),
- and the specific listed drug version.
Reply with the brand name (or an NDC number) you mean, and I can narrow down the specific US patent(s)/exclusivity term(s) associated with that exact product.
Sources:
[1] DrugPatentWatch.com – Cetirizine patent and exclusivity lookup