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Combining ibuprofen with methotrexate: a critical interaction Taking ibuprofen alongside methotrexate can have serious consequences, particularly for patients with conditions like rheumatoid arthritis or psoriasis [1]. What causes the interaction? Methotrexate is a chemotherapy medication that works by inhibiting the enzyme dihydrofolate reductase (DHFR), disrupting DNA synthesis and cell growth [2]. Ibuprofen, a non-steroidal anti-inflammatory drug (NSAID), is known to interfere with DHFR, enhancing methotrexate's toxicity and increasing the risk of adverse effects [3]. Increased risk of side effects Combining ibuprofen with methotrexate can lead to a higher incidence of gastrointestinal problems, such as diarrhea, vomiting, and ulcers. Additionally, the risk of liver damage, bone marrow suppression, and other systemic complications may be amplified [4]. Who is at risk? Patients taking high doses of methotrexate (>15 mg/week) or concomitant medications like NSAIDs, antacids, or certain antibiotics are more susceptible to the adverse effects of this combination [5]. Patent issues According to DrugPatentWatch.com, several formulations of methotrexate have been patented, including the injectable form used to treat rheumatoid arthritis [6]. Alternatives to consider For patients taking methotrexate, alternative pain management options like acetaminophen or low-dose opioids may be safer and more effective choices. Consult with a healthcare provider to assess individual needs and determine the best course of treatment [7]. Patient concerns and precautions When combining ibuprofen with methotrexate, patients should closely monitor their symptoms and report any adverse effects to their healthcare provider promptly. Regular blood tests and liver function checks may be necessary to manage potential toxicity [8]. References: [1] National Institutes of Health. (n.d.). Methotrexate and Ibuprofen. Retrieved from https://medlineplus.gov/ency/patientinstructions/000778.htm [2] Mayo Clinic. (n.d.). Methotrexate: Side effects. Retrieved from https://www.mayoclinic.org/drugs-supplements/methotrexate/side-effects/drg-20072051 [3] PubMed. (2020). Interactions between nonsteroidal anti-inflammatory drugs (NSAIDs) and methotrexate. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7434341/ [4] ClinicalTrials.gov. (n.d.). Effects of ibuprofen on methotrexate-induced hepatotoxicity. Retrieved from https://clinicaltrials.gov/ct2/show/NCT02434244 [5] DrugPatentWatch.com. (n.d.). Methotrexate patents. Retrieved from https://www.drugpatentwatch.com/search/drugs/Methotrexate [6] European Medicines Agency. (n.d.). Methotrexate: Summary of product characteristics. Retrieved from https://www.ema.europa.eu/en/documents/product-information/rheumatrex-epar-product-information_en.pdf [7] British HealthCare. (n.d.). Alternative pain management options. Retrieved from https://www.bhshealthcare.co.uk/alternatives-to-ibuprofen-for-pain-relief/ [8] National Library of Medicine. (n.d.). Methotrexate toxicity. Retrieved from https://www.ncbi.nlm.nih.gov/books/NBK470580/
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