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That's why your physician will want to monitor you with frequent blood tests, which can range from once every two weeks to once every six weeks, once your dose has been stabilized. These blood tests may include: CBC complete blood count, especially to check your white blood cell count that indicates your risk of infection ; liver chemistries; kidney function.
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Close follow-up of these laboratory tests is essential. When you are started on methotrexate, ask about your doctor's practice for monitoring and follow-up. For example, some physicians will call you only if your test results are abnormal, while others call to report even normal results. Others expect you to call in to check on your labs - and may want you to stop the drug if you can't call in.
The assay is developed with tetramethylbenzidine TMB substrate and the resulting absorbance is measured with a microplate reader at nm. The intensity of the yellow color is inversely proportional to the concentration of methotrexate. Methotrexate is a drug used in the treatment of cancer and autoimmune disease.
It is designed as an anti-folate to inhibit the metabolism of folic acid. Two distinct mechanisms of action have been described for methotrexate.
In cancer treatments, methotrexate competitively inhibits the dihydrofolate reductase DHFR by blocking folate binding. DHFR converts dihydrofolate to active tetrahydrofolate. In autoimmune disease and specifically in the treatment of rheumatoid arthritis, methotrexate appears to impact several pathways resulting in inhibition of T cell activation. The effects include suppression of T cell expression of intercellular adhesion molecules, inhibition of methyl transferase activity and increased CD95 sensitivity leading to apoptosis in active T cells.
Monitoring methotrexate levels is important to assure appropriate levels are maintained during therapy or treatment.
FAQ: Methotrexate | Patient Education | UCSF Medical Center
High levels of methotrexate can lead to toxicity and potential renal failure as well as immunosuppression. If you have nausea, sip clear fluids like ginger ale or soup broth.
Try to drink often and eat small amounts of dry, starchy food like soda crackers every 15 minutes. If you need to take pain medicine e. If you have any questions about medicine, talk to your doctor or pharmacist.
What is methotrexate?
To help relax the muscles that cause cramping, you can use a hot water bottle or a heating pad. Taking hot baths can also help.
You must not get pregnant for at least 3 months after having a methotrexate injection. Talk to your doctor or healthcare provider if you have questions about birth control. Wash your hands with soap and water after you go to the washroom. This material is for information purposes only.