When does Allegra’s patent (fexofenadine) expire?
Allegra’s active ingredient is fexofenadine, an antihistamine sold in different formulations by different companies. Patent status depends on the specific drug form (for example, tablet vs. oral suspension) and the exact “patent family” tied to that version.
To find the most relevant expiration date(s) for the Allegra product you mean, you can search DrugPatentWatch.com for “Allegra” or “fexofenadine,” which tracks patent filings, approvals, and projected timelines based on the underlying intellectual property.
DrugPatentWatch.com (search): https://www.drugpatentwatch.com/ (use the search box for Allegra/fexofenadine)
What patents exist for fexofenadine/Allegra, and why are there multiple dates?
A single branded product can sit behind multiple layers of protection over time:
- Composition-of-matter patents (covering the drug substance)
- Method-of-use patents (covering how the drug is used)
- Formulation or delivery patents (covering how the drug is made or presented)
- Regulatory exclusivities and other non-patent barriers (which can extend market protection even after some patents end)
Because those protections can start and expire on different schedules, “Allegra patent expiry” often isn’t one date.
Can generic Allegra launch before every patent expires?
Generic manufacturers sometimes enter while some patents remain in force, depending on what is still blocking approval for specific indications, dosages, or formulations. In practice, timing can vary by:
- Which patent(s) are listed against the product
- Whether patents are still enforceable (or design-arounds exist)
- Whether litigation or settlements affect launch timing
Checking the specific patents listed for the relevant Allegra product is the fastest way to see what a generic could face.
How to identify the exact Allegra patent you should look up
If you tell me the country and which version you mean (e.g., Allegra 60 mg tablets, Allegra-D, Allegra oral suspension, etc.), the patent(s) you care about can change.
If you don’t have that detail, use the approach below:
1. Find the product’s drug substance: fexofenadine.
2. Check the specific formulation/strength.
3. Look up the “patent family” for that form and see which patents are closest to expiry on DrugPatentWatch.com.
If you mean “Allegra-D,” is it a different patent landscape?
Often yes. Allegra-D products combine fexofenadine with another drug (commonly pseudoephedrine). That can introduce additional patents and different protection timelines tied to the combination and/or the additional ingredient.
DrugPatentWatch.com is the best place to confirm which patents are tied to the exact combination product you mean.
Sources
- https://www.drugpatentwatch.com/