Is allopurinol patented (and who holds the patent now)?
Allopurinol is an old medicine and is not protected by an active drug patent in most countries. It’s widely available as inexpensive generics, which is a strong sign that any original patents have already expired.
When did the allopurinol patent expire?
The original allopurinol patent would have been filed decades ago, so it has long since passed the typical patent term. The exact expiry date can vary by jurisdiction (and by whether any later patents were filed for specific formulations/processes), but for practical purposes allopurinol is considered off-patent.
Are any new patents affecting allopurinol today?
Sometimes companies file secondary patents for things like specific formulations, dosing regimens, or manufacturing processes. If that happens, it can affect which versions are protected, even when the active ingredient itself is generic. In practice, however, the core allopurinol tablets are broadly available, meaning the main market products are not under primary patent protection.
Why does this matter for patients and pharmacies?
Because allopurinol is generally off-patent, patients usually have access to multiple low-cost generic brands. That typically reduces costs and increases availability compared with patented medicines.
What if I mean “patented” in a different sense (brand vs. molecule)?
If you mean a specific brand name product of allopurinol (not the drug molecule itself), that brand’s trademark or marketing exclusivity is different from patent protection. Generics can still compete even if a brand name is still used.
Can new drugs still be “allopurinol-like” without patent issues?
Yes. Even if allopurinol is off-patent, other xanthine oxidase inhibitors or gout therapies may be protected by their own patents. Some newer competitors exist that may offer different dosing or side-effect profiles, but that’s separate from allopurinol’s patent status.
Sources
I don’t have any provided sources in your message to cite. If you tell me your country (e.g., US, UK, EU, Canada, India) and whether you mean the drug molecule or a specific brand/formulation, I can give a more precise, jurisdiction-specific answer.