Well, if you look at the side effects listed at the NIH site
, you will see diarrhea listed as a side effect. One way to determine if it is the 6MP, would to have him return to his previous dose and see if he returns to having formed stools. Of course, you should clear this with his doctor first.
Also, it could be coincidental. Hopefully this change has not signaled a return of disease activity.
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