I wouldn't take that dose of Ibu for 3 days... I bleed regularly, but if I take 1 200 mg ibuprofen I consistenly see an increase in bleeding. I will still (against my better judgment) take one here and there, but never more than one and only when I have a headache that is bad enough that I know Tylenol won't help.
I would guess it really depends on the severity of your Crohn's. Is this your GI that advised the Ibuprofen? Or some other doc?
--39 year old female, dx as UC in '04 (1st symptoms in '03), switched to Crohn's in '05, 1 fistula, crohn's colitis, limited to large intestine
--rejected (reaction/didn't work): Asacol, AZA, 6-MP, MTX, Remicade, Humira, prednisone
--stuck on methylprednisolone, tried Prochymal in Phase III study (can't wait til it's approved!)
--started Tysabri 3/21/08
--single mom to 10-year-old girl