Hi, I'm not sure what the maximum dose of mtx is, but there are some on here on 25mg.
Your consultant should have discussed with you what the next step will be if the increased dose doesn't have the required effect, but possibly he might add another DMARD, Combinations of two or three DMARDS often work well where one drug has failed.
Hopefully the increased mtx will work for you, lots of people do well on mtx alone.
There is a thread on the forum for partners/ families of RA sufferers. If you go to the forum home page and scroll down, it is third from the bottom.
Fingers crossed for improvement for you on the mtx.
Doreen xx