I have been taking it for over 2 years now. It has controlled my crohns so far from flaring up.
The med does give alot of side effects. With this drug you will be under close surveillance with bloodtests in the beginning. They checked for if my liver was responding well to it etc etc and they told me I had to keep an eye on it in the beginning when getting ill.
Also my white bloodcell count has been dropping alot in the past year with this drug so they had to reduce the dosage a few times and then up it again a bit.
As long as yoy have regular bloodtests you will be fine.
Side effects I have are very very dry skin all over and rashes, headaches, tired, mouth ulcers. But the last 2 can also come from low white bloodcell count and crohns itself.
I wish you the best of luck, in my opinion all this is a small price to pay for controlling the flare ups.
Just make sure they test your blood and you will be fine
oh and try to stay away from people coughing and sick people.... I get a cold just by looking at someone with a cold... VERY annoying...