I started Remicade two years ago and had really good results to start with. about a year into it the effect started wearing off after a month. My last infusion (at a higher rate) lasted about a month and I was told that I had developed antibodies to it.
To your question, I have never had any side effects to the drug. I had a mild allergic reaction during my 2nd or 3rd infusion that lasted about an hour, that's it.