methotrexate - injection (cont.)
DRUG INTERACTIONS: See also Warning section.Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.Some products that may interact with this drug include: acitretin, asparaginase, ciprofloxacin, digoxin, leflunomide, live vaccines, natalizumab, other cancer treatments potentially toxic to the kidney (e.g., cisplatin), other drugs potentially toxic to the liver (e.g., azathioprine, sulfasalazine, retinoids such as isotretinoin), penicillins, phenytoin, probenecid, procarbazine, pyrimethamine, sulfa medications, theophylline.Certain drugs that reduce stomach acid (proton pump inhibitors-PPIs such as esomeprazole, omeprazole, pantoprazole) may increase the blood level of methotrexate. This may lead to a higher chance of side effects, especially with high-dose methotrexate treatment. Ask your doctor or pharmacist for details and ways to lessen the risk of side effects.Certain antibiotics (e.g., chloramphenicol, sulfa, tetracyclines) may interfere with methotrexate blood tests (increase methotrexate blood levels due to protein-binding displacement). Make sure laboratory personnel and your doctors know you are using any of these types of antibiotics.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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