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Tiredness coming off 5-ASA (Asacol)

I have been taking Asacol 800 slow release tablets for over a year. For the last few months I have been getting joint pain, and I have been fatigued.

I talked to my GI, he was not sure if those were side-effects of the drug, or part of the IBD.

I have been on quite a high dose, so I have reduced the dose by a half (on to the maintenance dose).

Now I notice that the joint pain seems to be better, but I feel really tired.

Has anyone else felt more tired when they came off 5-ASA or lowered the dose?

ps so far no more symptoms since reducing the dose! I am going for a colonoscopy in 2 weeks time anyway.