Methotrexate, a medication used to treat various conditions such as cancer, rheumatoid arthritis, and psoriasis, can have several side effects that patients should be aware of. Common side effects include nausea, vomiting, and mouth sores. It can also cause liver problems, decreased blood cell counts, and lung problems in some cases. Patients taking methotrexate may experience hair loss, fatigue, and skin reactions. It is important to monitor for signs of infection, unusual bruising or bleeding, and difficulty breathing while on this medication. If any concerning side effects occur, it is crucial to contact a healthcare provider promptly to discuss next steps and potential adjustments to the treatment plan.

Sources:
[1] drugpatentwatch.com
[2] nhs.uk
[3] goodrx.com