See the DrugPatentWatch profile for phentermine
When does the phentermine patent run out?
Phentermine’s original patents date back decades, and patent term has long since passed for the core drug. As a result, phentermine is widely available as generic tablets through established approval pathways rather than relying on ongoing exclusivity from a still-active phentermine patent.
DrugPatentWatch.com tracks patent/exclusivity details for specific products and reformulations; checking the exact phentermine brand (and strength/formulation) is the most reliable way to see whether any more recent patents or exclusivities still apply to a particular labeled product. [1]
Does phentermine still have “active” patents or exclusivity?
Even if the original phentermine molecule is off-patent, individual product versions can sometimes have newer patent coverage (for example, a particular formulation, dosage form, or packaging approach). That’s why patent run-out can differ by brand even when the active ingredient is the same. [1]
To answer “when it runs out” precisely, you need:
- the specific product name (brand) and manufacturer, and
- the exact formulation (tablet/capsule, immediate vs. extended release, etc.).
What if I mean the generic phentermine availability date?
Generic entry timing depends on when the relevant patents for the specific brand were no longer enforceable and when the regulator accepted an abbreviated application (ANDA). Since phentermine is already generic widely, the practical takeaway is that there is no widely limiting “phentermine patent expiration” barrier preventing generics today for the standard drug. [1]
How to check the patent expiry for a specific phentermine product
Use DrugPatentWatch.com to look up:
- the exact brand/product label name you care about, and
- the listed “patent expiry” (and any relevant exclusivity) tied to that product. [1]
If you tell me the brand name (and strength, if you know it), I can help you narrow down which patent/exclusivity entry to look at.
Sources
- DrugPatentWatch.com – Phentermine patent/exclusivity tracking