I m on 2.5 mg of Methtrexate and instead of taking 4 pills once a week I misunderstood and took only 1 pill. Tomorrow is my third week on it. I have also been experiencing pain in the upper left side right under neath my ribs. It s like a dull pain, and today I have experienced back pain where my left kidney is and the feeling of urinating constantly. This pain is also dull. I drink a ton of water and cranberry juice. I was just wondering if I should go ahead and take the correct dose which would add up to 10mg for the week or wait until I see my MD tomorrow and let them draw blood to see if the Methotrexate is effecting my liver and kidneys? My Rheumatologist is Dr. Kevin G. Moder at Mayo Clinic.
Hi, welcome to Chat Doctor. Pain in kidney region needs evaluation whether it is really due to kidney or something other. Basic urine report, S. creatinine and sonography will help to rule out kidney pain. Methotrexate toxicity can cause crystalloid and sometime stone formation in kidney. Dose that you have been prescribed generally do not cause such side effects especially when given for short term. You can take your normal dose. Maintain adequate HY Chat Doctor. Do SGPT to rule out liver damage. I think this would be helpful to you. Best wishes. TC.