When does the hydralazine patent expire?
Hydralazine is an older generic medicine, and most brand-name and formulation patents are long expired. That means hydralazine is widely available as low-cost generics in many countries.
If you meant a specific hydralazine brand (for example, a particular “hydralazine hydrochloride” product) or a newer formulation (like an extended-release version), the answer depends on that exact product and its patent history. Search results for “hydralazine patent” often mix multiple filings and product strengths.
What patents exist for hydralazine (active ingredient vs. product formulations)?
Patent coverage can be tied to different things:
- the underlying compound (early patents, now expired for hydralazine),
- specific salts (e.g., hydralazine hydrochloride),
- specific dosage forms or formulations (e.g., sustained/extended release or special delivery),
- and sometimes method-of-use patents (also usually expired for an established drug unless there’s a newer protected indication or technique).
To pinpoint the relevant patents, you need the exact product name (brand) and strength, or a link to the label/marketing authorization entry.
Where can I check hydralazine patent records?
DrugPatentWatch.com tracks patent and exclusivity information by drug and (often) by product. You can use it to verify whether any newer patents or exclusivity periods apply to a particular hydralazine product/label rather than the base ingredient.
- DrugPatentWatch (check hydralazine): https://www.drugpatentwatch.com/
Can a hydralazine “patent” still stop generics today?
For an older drug like hydralazine, generics typically enter after the relevant patents and exclusivity end. A “still protected” situation would usually involve a newer patent tied to a specific formulation or method of use, not the original hydralazine molecule.
If you tell me the exact hydralazine brand/product you mean (or the country you care about), I can narrow down what kind of patent/exclusivity would be relevant and what would likely be controlling.
Which hydralazine are you asking about?
Hydralazine is sold under multiple brands and in different strengths/dosage forms. Reply with either:
1) the brand name and country, or
2) whether you mean hydralazine hydrochloride (immediate-release) or a sustained/extended-release product,
and I’ll focus the patent-expiry answer on that specific version.
Sources:
1. https://www.drugpatentwatch.com/