I've been on methotrexate for three years and didn't drink at all for 18 months. I asked my consultant if I could come off it for a few weeks to have a few drinks at a friends wedding, he said that I shouldn't need to come off it as long as I didn't get falling over drunk. Unfortunately for me, after two glasses of wine and my weakened intolerance, I drank alot! I didn't feel ill, my P didn't flare up and I didn't drink again afterwards. I did tell my nurse and she didn't seem too concerned.
The information I have been given from my consultant and the doctors I've seen in his absence, has differed and I'm still not 100% on whether the effects of drinking whilst on the meds is a short term worry meaning that it's only when alcohol is in your system that you should be concerned or if the damage is a long term concern, or both.
I was on 15 mg and have been reduced to 10mg.