See the DrugPatentWatch profile for methotrexate

Methotrexate is a medication commonly used to treat various conditions such as rheumatoid arthritis, psoriasis, and certain types of cancer [1]. It is typically taken orally in the form of a tablet or liquid [1][2]. However, in some cases, it may also be administered via injection, either subcutaneously (under the skin) or intramuscularly (into the muscle) [1][2].

When taken orally, methotrexate is usually taken once a week, not daily, as is commonly misunderstood [1]. This is because methotrexate has a long half-life, meaning it stays in the body for a prolonged period [1]. Therefore, taking it too frequently can increase the risk of side effects [1].

It is crucial to follow the specific dosage and administration instructions provided by a healthcare professional, as the appropriate dosage can vary depending on the individual's medical condition, weight, and other factors [1].

Sources:

[1] "Methotrexate." MedlinePlus, U.S. National Library of Medicine, 15 Feb. 2022, medlineplus.gov/druginfo/meds/a68/002932.html.

[2] "Methotrexate." Drugs.com, www.drugs.com/methotrexate.html.

[3] "Methotrexate." DrugPatentWatch, 2022, www.drugpatentwatch.com/drugs/methotrexate.