What is Methotrexate?Methotrexate is used to treat certain cancers, rheumatoid arthritis (including juvenile arthritis), and severe psoriasis (immune disorder that affects the skin).
What is the most important information I should know about Methotrexate?Methotrexate can cause serious and life-threatening side effects. Your doctor will monitor you when you are taking Methotrexate to check how it affects your body. Inform your doctor immediately of any side effects you experience while taking Methotrexate.
Methotrexate can cause harm to your unborn baby. If you are pregnant, or your partner is pregnant or plans to become pregnant, you should not take Methotrexate. Women should wait at least 1 menstrual cycle after stopping Methotrexate therapy before getting pregnant, and men should wait at least 3 months after stopping Methotrexate therapy before getting their partner pregnant. If you are a woman of childbearing age, you should have a pregnancy test before taking Methotrexate. Both men and women should use effective methods of birth control while taking Methotrexate.
You should stop taking Methotrexate and call your doctor right away if you experience diarrhea, mouth sores, a fever, dehydration, cough, bleeding, shortness of breath, any signs of an infection, or a skin rash. Your doctor may also prescribe a folate-containing medication to take in addition to Methotrexate to help reduce possible side effects.
Who should not take Methotrexate?You should not take Methotrexate if you are pregnant or plan to become pregnant, are breastfeeding, have conditions that weaken your immune system, your bone marrow doesn't make enough blood cells, you have low platelet or white blood cell counts, serious anemia, drink alcohol, have chronic liver disease, or if you are allergic or have a hypersensitivity to Methotrexate.
What should I tell my doctor before I take the first dose of Methotrexate?Tell your doctor if you are pregnant or if you or your sexual partner plan to become pregnant.
Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Methotrexate. Also, talk to your doctor about your complete medical history, especially if you have kidney problems or are getting dialysis, liver problems, fluid in your stomach area, or if you have lung problems, including fluid in your lungs.
What is the usual dosage?The information below is based on the dosage guidelines your doctor uses. Depending on your condition and medical history, your doctor may prescribe a different regimen. Do not change the dosage or stop taking your medication without your doctor's approval.
Your doctor might prescribe different doses than those listed below based on your condition and its severity.
Psoriasis, Rheumatoid Arthritis, and Juvenile Rheumatoid Arthritis
Adults: The usual starting dose includes a single dose of 7.5 milligrams (mg) taken once a week, or 2.5 mg taken every 12 hours for 3 doses once a week.
How should I take Methotrexate?Methotrexate should be taken exactly as prescribed by your doctor. You should not take more Methotrexate than prescribed.
For severe psoriasis, rheumatoid arthritis, and juvenile rheumatoid arthritis, Methotrexate should be taken weekly, not every day. If you take too much Methotrexate, call your doctor immediately or go to the nearest emergency room.
What should I avoid while taking Methotrexate?You should avoid getting pregnant or trying to become pregnant, breastfeeding, drinking alcohol, or receiving certain live vaccines.
What are possible food and drug interactions associated with Methotrexate?If Methotrexate is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Methotrexate with the following: chloramphenicol, certain antibiotics, nonsteroidal anti-inflammatory drugs (NSAIDs), penicillin-type antibiotics, phenylbutazone, phenytoin, probenecid, salicylates, tetracycline, theophylline, trimethoprim/sulfamethoxazole, and vitamins containing folic acid.
What are the possible side effects of Methotrexate?Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.
Side effects may include: cancer of the lymphatic system (lymphoma); kidney damage; lower white blood cells, red blood cells, and platelets in your blood; liver damage; lung disease; infections; severe anemia; severe skin reactions and rashes
Can I receive Methotrexate if I am pregnant or breastfeeding?Methotrexate should not be used if you are pregnant, plan to become pregnant, or are breastfeeding. Men who are taking Methotrexate should not get their partners pregnant for at least 3 months after last taking Methotrexate.
What should I do if I miss a dose of Methotrexate?If you forget to take a dose of Methotrexate, ask your doctor if and when you should take your next dose.
How should I store Methotrexate?Store at room temperature.
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