Common use

Methotrexate is a potent antimetabolite and disease-modifying antirheumatic drug (DMARD) widely used in the treatment of certain types of cancer, rheumatoid arthritis, and severe psoriasis. As an immunosuppressant and chemotherapy agent, methotrexate works by inhibiting dihydrofolate reductase — a critical enzyme responsible for synthesizing the nucleotides required for DNA production. By blocking DNA synthesis, DNA repair, and cell mitosis, this medication effectively targets and slows the rapid growth of abnormal cells.

The cells most sensitive to methotrexate include those of malignant tumors, bone marrow, embryonic tissue, and the epithelial lining of the intestinal mucosa, bladder, and oral cavity. This selectivity makes it a valuable tool in cancer treatment protocols as well as autoimmune disease management.

When used as a chemotherapy medication, Methotrexate is prescribed for the treatment of breast cancer, squamous cell carcinoma of the head and neck, lung cancer, trophoblastic tumors, cervical cancer, ovarian cancer, bladder cancer, colorectal cancer, esophageal cancer, stomach cancer, pancreatic cancer, testicular cancer, acute lymphoblastic leukemia, and many other malignancies. As a DMARD, it is considered a first-line treatment for rheumatoid arthritis, helping to reduce joint inflammation, pain, and long-term damage. For psoriasis treatment, methotrexate is reserved for moderate-to-severe cases that have not responded adequately to other therapies. When you buy Methotrexate online from a licensed pharmacy, you can access this essential medication conveniently and affordably.



Dosage and direction

Take Methotrexate exactly as prescribed by your physician. This medication should be taken orally, with or without food, and the tablet must be swallowed whole — do not chew or crush it. For the treatment of rheumatoid arthritis and psoriasis, Methotrexate is administered on a weekly basis (not daily). The typical starting dose is 7.5 mg taken once per week, or alternatively 2.5 mg every twelve hours for three doses, also once weekly. Cancer treatment with Methotrexate requires individualized dosing and must be conducted strictly under the supervision and control of your oncologist or treating physician. Never adjust your dosage without medical guidance.



Precautions

Particular caution should be exercised when using Methotrexate in patients with ascites, dehydration, obstructive gastrointestinal diseases, pleural or peritoneal effusion, chronic renal failure, or parasitic and infectious diseases of viral, fungal, or bacterial origin, due to the elevated risk of severe generalized disease development. Methotrexate toxicity is significantly increased in individuals with herpes simplex, herpes zoster, chickenpox, measles, amoebiasis, strongyloidiasis, gout (including a history of gout), oral mucosa infections and inflammation, nausea and vomiting leading to dehydration, stomach or duodenal ulcers, ulcerative colitis, prior chemotherapy or radiation therapy, and general asthenia.

When this immunosuppressant is used for cancer treatment, extra caution is warranted in patients with aciduria (urine pH below 7) and those with suppressed bone marrow hematopoiesis. Avoid prolonged sun exposure during treatment. Vaccination with live vaccines should be postponed for 3 to 12 months after completing a course of Methotrexate. Both men and women of reproductive age must use reliable contraception during and after treatment, as this drug poses serious risks to fetal development. If you buy methotrexate, always discuss your full medical history with your doctor beforehand.



Contraindications

Methotrexate is strictly contraindicated in patients with hypersensitivity to its active ingredient or any excipients, those with immune deficiency syndromes, and in pregnant or breastfeeding women. When Methotrexate generic or brand formulations are prescribed for psoriasis treatment or autoimmune conditions such as rheumatoid arthritis, it cannot be used in patients who also have severely suppressed bone marrow hematopoiesis, significant kidney impairment, or serious liver failure.



Possible side effect

Methotrexate is generally well tolerated at therapeutic doses; however, some patients may develop mouth sores (oral mucositis), stomach upset, or decreased white blood cell counts (leukopenia). This chemotherapy and DMARD medication is known to be potentially toxic to the liver, kidneys, lungs, and bone marrow — which is why regular blood tests and organ function monitoring are essential throughout the course of treatment.

Additional adverse reactions may include persistent headache, drowsiness, fatigue, and allergic responses such as skin rash, itching, dizziness, and hair loss (alopecia). Some patients may also experience gastrointestinal symptoms including nausea, vomiting, and diarrhea. Report any unusual or persistent side effects to your healthcare provider promptly to ensure timely medical intervention.



Drug interaction

Inform your doctor about all prescription medications, over-the-counter drugs, herbal products, and dietary supplements you are currently taking. This is especially important for NSAIDs such as ibuprofen (Motrin, Advil), diclofenac (Cataflam, Voltaren), naproxen (Aleve, Naprosyn), etodolac (Lodine), indomethacin (Indocin), meloxicam (Mobic), and piroxicam (Feldene), as these drugs can significantly increase Methotrexate toxicity. The same applies to azathioprine (Imuran), another immunosuppressant. Use of anti-gout medications such as allopurinol, colchicine, or sulfinpyrazone requires careful dose adjustment.

Additionally, inform your doctor if you are taking chloramphenicol (Chloromycetin), hydroxychloroquine (Plaquenil, Quineprox), retinol, tretinoin (Retin-A), isotretinoin (Accutane), corticosteroids (prednisone and others), sulfa drugs (Bactrim, Septra, Azulfidine), phenytoin (Dilantin), theophylline (Theobid, Theo-Dur, Elixophyllin, Slo-Bid), probenecid (Benemid), tetracycline antibiotics (Brodspec, Panmycin, Sumycin, Tetracap), oral antidiabetic medications such as glipizide (Glucotrol), chlorpropamide (Diabinese), acetohexamide (Dymelor), glimepiride (Amaryl), or tolbutamide (Orinase), penicillin-class antibiotics, or salicylates (Dolobid, Salflex, Tricosal, Disalcid, Doan's Pills).



Missed dose

Consult your doctor immediately if you miss a dose of Methotrexate. Because this medication follows a specific weekly schedule (for rheumatoid arthritis and psoriasis treatment) or a precise cancer treatment protocol, it is important to receive professional guidance rather than self-adjusting your dosing.



Overdose

Contact your doctor or seek emergency medical assistance immediately if you suspect a Methotrexate overdose. Warning signs include severe nausea, vomiting, pronounced weakness, unusual pallor, easy bruising or bleeding, mouth sores, black or bloody stools, coughing up blood, vomit resembling coffee grounds, significantly decreased urination, or complete anuria. Methotrexate overdose is a medical emergency requiring prompt intervention.



Storage

Store Methotrexate in a dry, tightly sealed container at room temperature between 15-30 C (59-86 F), protected from direct sunlight. Keep this medication out of the reach of children and pets at all times.



Disclaimer

We provide only general information about medications which does not cover all directions, possible drug integrations, or precautions. Information at the site cannot be used for self-treatment and self-diagnosis. Any specific instructions for a particular patient should be agreed with your health care adviser or doctor in charge of the case. We disclaim reliability of this information and mistakes it could contain. We are not responsible for any direct, indirect, special or other indirect damage as a result of any use of the information on this site and also for consequences of self-treatment.