When does the original methotrexate patent expire?
Methotrexate is an older, widely used generic drug, first introduced decades ago. That means there is no single, currently relevant “original patent expiration year” that would apply in the same way as with newer branded drugs, because the market exclusivity associated with the original patents has long since lapsed and methotrexate is available generically.
Why there isn’t one clear “expiration year” like newer drugs
Patent timelines for older medicines often depend on jurisdiction and on which specific patents are being referenced (for example, early composition-of-matter vs. later formulation/manufacturing improvements). For methotrexate, those earlier rights have already expired in most (if not all) major markets, which is why the drug is not protected by a single ongoing brand-exclusive patent term.
What to do if you need the exact year for a specific jurisdiction or patent family
If you tell me the country (for example, US, EU, UK, Canada) and whether you mean the first filing, the first granted patent, or a specific listed patent family, I can narrow it to the relevant expiration timeline.