Yup infliximab is remicade, sorry its just in the UK the docs tend to call it infliximab! I have it episodically, thats the way NICE originally approved it (technically the old guidelines still say that, think they're getting changed officially later in the year, but now most doctors won't give it episodically as there is some evidence to say that its better to have it regularly. Methotrexate also makes it less likely that you will develop antibodies to remicade so they're happy for me to have it as and when needed as I am being maintained by another drug and it makes it less risky when I do have the infliximab) so back then you were only given one dose and then they'd only give another when symptoms returned which for me was 2 years, then 3 years, then 6 months, then I had to have 2 doses 8 weeks apart as I needed 2 to get me into remission and its now been over 3 months and so far still in remission.
I changed to methotrexate injections when I had my last infliximab as both myself and my doctors felt that one reason I was maintaining remission like I had been was that either I wasn't absorbing the methotrexate tablets anymore or that maybe I needed a slightly more potent dose, 25mg is the highest dose of methotrexate they give so I'm still on 25mg but the injections are more potent and of course if it was due to absorbing issues then injecting it would get round that too, and so far so good! From the information I've read on my NHS trust they've had patients on methotrexate for longer than 10 years without any problems. I was put on the methotrexate as I was allergic to pentasa, steroids were useless and my docs went for methotrexate over azathiaprine (Immuran) as it works better with arthritis which I also have (which again has been in remission along with the Crohn's) though its similar to methotrexate but less dangerous from what I've heard.