MTX works wonders for the right patients, may or may not work for your husband.
Has been a life saver for me now for the last 12 years and have had no really serious side effects, even got through double hip replacement, with no bad infections.
How big a dose has the Dr started him on and how often?
I take 35mg once a week, which is a very high dosage by injection, but started of on 5mg for 3 months, then 10mg for 3 months, slowly increasing over the years, as they discovered my monthly liver tests came back as normal, which I am very grateful they do.
My blood tests are ESR and CRP, can be very high at their worst, RF is negative, as is genetic tests for psorastic arthiritis which is first cousin the RF.
Taking the MTX in tablet form did not work for me, was only taking up a part of the dosage, again took many months for the Dr's to discover why they were getting no result with ever increasing dosage, and still blood tests results were not dropping.
You also should have been given a pesription for Folic acid to take the following day, 24 hours later, as the MTX does damage to the Vit B, in your bloodstream, and the folic acid replaces that.
Do not get too worried, the MTX is considered the gold standard for RA, but there are many other drugs in the rheumotologists arnesal and if the MTX is ineffective they will try some of those.
I have been given over the years many different drugs, they have discovered that my system does not like sulfur drugs, ltching, hot flushes that never go away, high blood pressure, dangerously high, so that has restricted my drugs I can be given.
Also have survived a battle with cancer in my past so that also restricts the drugs I can be given.
Best wishes Lyn