Hi everyone,
I do not have Crohn's disease but I do have Multiple Sclerosis and have been on Tysabri therapy for over a year now.
Acne and a skin rash are both listed as side effects and/or allergic reactions to the medication on the Tysabri label... see page 8 which lists both skin rash and dermatitis:
http://www.fda.gov/cder/foi/label/2004/125104lbl.pdf
For most MS patients, the best way to avoid these common side effects and/or allergic reactions to Tysabri is to pretreat with a Benadryl drip for 30 minutes just prior to the Tysabri infusion, or pretreat with a Claritin tablet approximately 2 hours before your infusion (this is what I do is I take a Claritin with my coffee at home). Also, slowing the drip/IV down can also prevent these side effects/allergic reactions to the medication as it gives the body a better chance to adjust itself to the medication being infused.
I hope this information helps those of you with CD on Tysabri, or considering Tysabri therapy. Nevertheless, it is always best to discuss this with your own treating gastroenterologist.
All my best to each of you,
Lauren