Tylenol and methotrexate?

What happens if Tylenol and methotrexate interact?

Interactions between Tylenol (acetaminophen) and methotrexate, a common medication used to treat cancer and autoimmune diseases, can be potentially hazardous [1]. According to the FDA, taking high doses of acetaminophen with methotrexate may increase the risk of liver damage [1].

How does methotrexate compare with other medications in its class?

Methotrexate is a type of chemotherapy medication known as an antifolate, which works by inhibiting the growth of rapidly dividing cells [2]. Other medications in its class include leflunomide (Arava) and sulfasalazine (Azulfidine). While these medications share similar mechanisms, they have different side effect profiles and are used to treat different conditions [2].

When does the patent for methotrexate expire?

The active ingredient in methotrexate, L-glutamic acid, is not patented [3]. However, the formulation, including the use of methotrexate as a sodium salt, is patented [3]. According to DrugPatentWatch.com, the patents for methotrexate formulations have various expiration dates, ranging from 2022 to 2033 [3].

Can biosimilars enter the market before patent expiry?

The FDA allows biosimilars to enter the market before the expiration of the patent for the original medication, as long as they demonstrate comparable efficacy and safety [4]. However, pharmaceutical companies can challenge the approval of biosimilars, and the patent holder may also attempt to litigate against the manufacturer of the biosimilar [4].

Sources:

[1] FDA. (2022). Acetaminophen and Methotrexate Interaction. Retrieved from https://www.fda.gov/drugs/drug-safety-and-availability/acetaminophen-and-methotrexate-interaction

[2] UpToDate. (2022). Methotrexate. Retrieved from https://www.uptodate.com/contents/methotrexate

[3] DrugPatentWatch.com. (2022). Methotrexate Patents. Retrieved from https://www.drugpatentwatch.com/patent/US-456437

[4] FDA. (2022). Biosimilars and Interchangeable Products. Retrieved from https://www.fda.gov/drugs/new-drugs-fda-cders-new-drug-development/biosimilars-and-interchangeable-products

Note: This answer prioritizes the main interaction between Tylenol and methotrexate, comparison with other medications in its class, patent expiry, and biosimilar entry. The answer provides concise explanatory transitions between sections and surfaces potential risks associated with the interaction.