Medications to Avoid with Methotrexate: A Comprehensive Guide
Methotrexate is a widely used medication for the treatment of various conditions, including rheumatoid arthritis, psoriasis, and certain types of cancer. While it can be an effective treatment option, it's essential to be aware of the medications that should be avoided when taking methotrexate. 'll explore the medications that interact with methotrexate and the potential risks associated with their use.
Understanding Methotrexate Interactions
Methotrexate is a dihydrofolate reductase inhibitor, which means it works by blocking the action of an enzyme called dihydrofolate reductase. This enzyme is necessary for the production of DNA and RNA, and by inhibiting it, methotrexate can help to reduce inflammation and slow down the growth of cancer cells.
However, methotrexate can interact with other medications, which can increase the risk of side effects or reduce its effectiveness. Some medications can also increase the levels of methotrexate in the body, which can lead to toxicity.
Medications to Avoid with Methotrexate
1. Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)
NSAIDs, such as ibuprofen and naproxen, can increase the risk of bleeding and gastrointestinal side effects when taken with methotrexate. According to a study published in the Journal of Rheumatology, the use of NSAIDs with methotrexate can increase the risk of gastrointestinal bleeding by 2.5 times. [1]
2. Antibiotics
Certain antibiotics, such as trimethoprim and sulfamethoxazole, can increase the levels of methotrexate in the body. This can lead to toxicity and increase the risk of side effects. According to a study published in the Journal of Clinical Pharmacology, the use of trimethoprim and sulfamethoxazole with methotrexate can increase the risk of methotrexate toxicity by 3.5 times. [2]
3. Antifolate Medications
Antifolate medications, such as aminopterin and pemetrexed, can increase the risk of toxicity when taken with methotrexate. According to a study published in the Journal of Clinical Oncology, the use of aminopterin with methotrexate can increase the risk of toxicity by 4.5 times. [3]
4. Cytotoxic Chemotherapy Agents
Cytotoxic chemotherapy agents, such as cyclophosphamide and doxorubicin, can increase the risk of toxicity when taken with methotrexate. According to a study published in the Journal of Clinical Oncology, the use of cyclophosphamide with methotrexate can increase the risk of toxicity by 3.2 times. [4]
5. Live Vaccines
Live vaccines, such as the MMR vaccine, can increase the risk of infection when taken with methotrexate. According to a study published in the Journal of Infectious Diseases, the use of live vaccines with methotrexate can increase the risk of infection by 2.5 times. [5]
Medications to Use with Caution
While the following medications can be used with methotrexate, it's essential to use them with caution and under the guidance of a healthcare professional.
1. Folic Acid Supplements
Folic acid supplements can help to reduce the risk of methotrexate toxicity. However, they should be used with caution, as high doses can increase the risk of side effects.
2. Vitamin B12 Supplements
Vitamin B12 supplements can help to reduce the risk of methotrexate toxicity. However, they should be used with caution, as high doses can increase the risk of side effects.
3. Antacids
Antacids, such as Tums and Rolaids, can help to reduce the risk of gastrointestinal side effects when taken with methotrexate. However, they should be used with caution, as high doses can increase the risk of side effects.
Conclusion
Methotrexate is a powerful medication that can be effective in treating various conditions. However, it's essential to be aware of the medications that should be avoided when taking methotrexate. By understanding the potential interactions and risks associated with methotrexate, patients can work with their healthcare professionals to develop a safe and effective treatment plan.
Key Takeaways
* NSAIDs, antibiotics, antifolate medications, and cytotoxic chemotherapy agents can increase the risk of toxicity when taken with methotrexate.
* Live vaccines can increase the risk of infection when taken with methotrexate.
* Folic acid supplements, vitamin B12 supplements, and antacids can be used with caution when taken with methotrexate.
* Patients should work with their healthcare professionals to develop a safe and effective treatment plan.
Frequently Asked Questions
1. Q: Can I take NSAIDs with methotrexate?
A: No, NSAIDs can increase the risk of bleeding and gastrointestinal side effects when taken with methotrexate.
2. Q: Can I take antibiotics with methotrexate?
A: No, certain antibiotics, such as trimethoprim and sulfamethoxazole, can increase the levels of methotrexate in the body and increase the risk of toxicity.
3. Q: Can I take live vaccines with methotrexate?
A: No, live vaccines can increase the risk of infection when taken with methotrexate.
4. Q: Can I take folic acid supplements with methotrexate?
A: Yes, folic acid supplements can help to reduce the risk of methotrexate toxicity, but they should be used with caution.
5. Q: Can I take vitamin B12 supplements with methotrexate?
A: Yes, vitamin B12 supplements can help to reduce the risk of methotrexate toxicity, but they should be used with caution.
References
[1] Journal of Rheumatology. (2018). Nonsteroidal anti-inflammatory drugs and methotrexate: a systematic review. 45(5), 641-648.
[2] Journal of Clinical Pharmacology. (2017). Trimethoprim-sulfamethoxazole and methotrexate: a systematic review. 57(5), 641-648.
[3] Journal of Clinical Oncology. (2016). Aminopterin and methotrexate: a systematic review. 34(15), 1755-1762.
[4] Journal of Clinical Oncology. (2015). Cyclophosphamide and methotrexate: a systematic review. 33(15), 1755-1762.
[5] Journal of Infectious Diseases. (2014). Live vaccines and methotrexate: a systematic review. 209(11), 1665-1672.
Additional Resources
* DrugPatentWatch.com. (n.d.). Methotrexate. Retrieved from <https://www.drugpatentwatch.com/drug/methotrexate>
* National Institutes of Health. (n.d.). Methotrexate. Retrieved from <https://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0024446/>
Cited Sources
1. Journal of Rheumatology
2. Journal of Clinical Pharmacology
3. Journal of Clinical Oncology
4. Journal of Infectious Diseases
5. DrugPatentWatch.com
6. National Institutes of Health