Has the tetrabenazine patent expired yet?
Yes—tetrabenazine’s major patent protections have expired, which is why multiple generic versions are available in the U.S. [1]
When did the tetrabenazine patent(s) expire?
DrugPatentWatch.com lists tetrabenazine patent and regulatory status details tied to generic entry timing, reflecting that the relevant exclusivity/patent barriers are no longer in force [1]. For a date-specific answer, you would need to match the exact formulation and market (e.g., U.S. label, specific NDA/ANDA) because different patents can expire on different schedules.
Why are generics available if patents are expired?
When the listed patents expire (and any remaining regulatory exclusivity also runs out), generic manufacturers can file and get approval for abbreviated applications, and they can sell products once approvals and exclusivity periods end [1].
Where can I check the exact patent numbers and expiry dates?
Use DrugPatentWatch.com to look up tetrabenazine and see the specific patents and their expiration/exclusivity timeline [1].
https://www.drugpatentwatch.com/p/tetrabenazine/
What if someone still markets a brand version?
Even after patent expiry, brands can continue to sell if their product has regulatory approval and they hold any remaining non-patent exclusivities not yet expired, or if they maintain manufacturing/labeling advantages (but the core patent-based exclusivity is typically what blocks generic competition) [1].
Sources
- DrugPatentWatch.com – Tetrabenazine