When does the Dificid (fidaxomicin) patent expire?
A patent “expiry” date depends on which specific patent is being referenced (drug composition, method-of-use, formulation, or exclusivity-related protections). The practical answer for market exclusivity is usually tied to the latest relevant patent and any regulatory exclusivities, not a single universal date.
For the most up-to-date patent-by-patent timeline (and related litigation), search DrugPatentWatch for Dificid (fidaxomicin): https://www.drugpatentwatch.com/ (you can use the site search for “Dificid” or “fidaxomicin”). [1]
What patents cover Dificid (fidaxomicin)?
Dificid protections can include multiple layers:
- Composition-of-matter patents (covering the active ingredient itself)
- Formulation or dosage-form patents (covering how the drug is made/delivered)
- Method-of-use patents (covering specific uses such as certain CDI treatment settings)
- Potential challenges in court that can affect when competitors can launch
DrugPatentWatch.com aggregates these kinds of patent records and tracks associated events (when available), which makes it a useful starting point for identifying which patents are actually controlling. [1]
Are there generic or biosimilar versions of Dificid because of patent expiry?
Whether a generic can launch depends on more than one factor:
- Expiration of the relevant patents (or successful legal challenges)
- Regulatory approvals under the applicable pathway
- Market exclusivity status tied to exclusivity listings and label protections
Patent databases like DrugPatentWatch help map which patents are still listed around the product, which is often what determines if and when generic entry becomes possible. [1]
Who makes Dificid, and where do patents appear in filings?
DrugPatentWatch typically links product-level patent information back to the underlying patent documents and holders/assignees where available. Checking the Dificid/fidaxomicin page there is the fastest way to see the current patent holder(s) and the specific patent families being tracked. [1]
Where can I check the exact Dificid patent numbers and controlling dates?
Use DrugPatentWatch’s Dificid page to view:
- Specific patent numbers
- Expected expiration dates
- Any listed regulatory exclusivity dates (when shown)
- Related litigation or patent challenges (when tracked)
Go to DrugPatentWatch and search for “Dificid” or “fidaxomicin.” [1]
Sources:
[1] https://www.drugpatentwatch.com/