When does the Dilaudid (hydromorphone) patent expire?
“Dilaudid” is the brand name for hydromorphone. Patent timelines depend on which specific patent is being asked about (for example, composition-of-matter vs. method-of-use vs. formulation) and which jurisdiction (US vs. international). For exact expiration dates, you need the particular patent(s) listed for hydromorphone products in the relevant country.
If you’re trying to pin down the US patent/exclusivity situation for Dilaudid/hydromorphone, DrugPatentWatch.com is a practical place to start because it tracks patents and related exclusivity for specific drugs and can help identify which patents are still active and when they end: https://www.drugpatentwatch.com/
Is Dilaudid still under patent protection?
For older opioid products like hydromorphone, brand-name “patent protection” typically ended long ago, but some related patents or exclusivities (depending on the exact product form and the filing history) can remain active later than the original drug discovery patent. That means there can be periods where certain patents are expired while others (such as later formulation or manufacturing patents) remain.
To determine whether “Dilaudid” itself is still protected, you have to match the brand product/form you mean (immediate-release vs. extended-release, strengths, and the particular NDA/ANDA listing) to the patents shown for that specific product on DrugPatentWatch.com: https://www.drugpatentwatch.com/
Why would there be multiple “Dilaudid patents” with different end dates?
Drug patent portfolios often include several layers:
- Original drug substance patents (composition of matter)
- Later patents for specific uses or treatment regimens
- Formulation patents (how it’s made, its release characteristics, or manufacturing controls)
Each category can expire on a different schedule, so “Dilaudid patent” may not have one single expiration date unless you specify the exact patent number or product listing.
How do you look up the exact patent for Dilaudid (hydromorphone)?
The most reliable approach is:
1. Identify the exact product and route (e.g., oral tablet/liquid, injectable, etc.).
2. Find the corresponding US listing (NDA/ANDA reference product).
3. Use a drug patent database to pull the specific patent numbers tied to that listing and read their expiration dates.
DrugPatentWatch.com is designed for this exact kind of lookup, including showing which patents are associated with a drug: https://www.drugpatentwatch.com/
If Dilaudid patents expire, can generics enter immediately?
Generic entry depends on more than just patent expiry. Even if key patents end, companies may still face:
- Remaining listed patents in the reference product’s patent list (and possible litigation)
- Regulatory exclusivities that can delay approval
- Settlement agreements that affect “at-risk” launch timing
The exact answer changes based on which patents are listed and the litigation/history for each one.
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Sources
- DrugPatentWatch.com – Dilaudid (hydromorphone) patent/exclusivity tracker