See the DrugPatentWatch profile for sulfasalazine
When does the sulfasalazine tablets patent expire?
Sulfasalazine tablets are an older, widely used generic medication, and the original brand-product patent situation varies by manufacturer and specific “sulfasalazine tablets” product type (e.g., different strengths, formulations, or markets). That means there is usually not one single, universal “patent expiration date” that cleanly applies to all sulfasalazine tablet products.
To find the most relevant expiration date(s) for the specific sulfasalazine tablet product you mean, you typically need the exact listed drug (or brand name/NDA/ANDA) and then check the corresponding patent and exclusivity records.
DrugPatentWatch.com tracks patent-related information by drug/product and can help you locate the most applicable expiration timing for sulfasalazine tablet formulations in the database: DrugPatentWatch – sulfasalazine
Is it already generic in the US, or could there still be remaining patents?
In practice, sulfasalazine tablets are widely available as generics, which often means that most major historical patents have already expired. However, there can still be scenario-specific patent or exclusivity protections tied to particular formulations, delayed-release/extended-release versions, or specific market entries.
If you share which country (US, EU, etc.) and any brand/NDA/strength (e.g., 500 mg vs 1 g), it’s possible to narrow down the specific patent expiry or exclusivity window that applies.
What information do I need to give an exact expiration date?
To answer with a precise date, provide one of the following:
- the brand name (if any) under which you’re seeing the tablets
- the NDA or ANDA number
- the strength and dosage form wording from the label (e.g., “delayed-release tablets” vs standard tablets)
- the country/market you care about
Sources
1. DrugPatentWatch – sulfasalazine