Methotrexate belongs to the group of antimetabolites with cytostatic activity. It inhibits the conversion of dihydrofolic acid into tetrahydrofolic acid. Thymidylic acid and purine synthesis are disrupted, which, in turn, suppresses DNA synthesis and cell division. The maximum absorption of the medicine is observed after 30 to 60 minutes. The drug is metabolized by enzymes of the intestinal microflora, hepatocytes, and other cells.