Here's a few suggestions:

1) Read the tysabri sticky at the top of the forum, there's a ton of information from current Tysabri users. It's a monoclonal antibody. Not an interferon or a glatimer acetate.

2) got to www.tysabri.com

3) go to http://www.tysabri.com/en_US/tysb/pdf/TYSABRI-pi.pdf which is the insert for tysabri that lists all the clinical trial data, the adverse reactions and contraindications.

Most everything you want to know about Ty is listed there. You can read through it and all your questions will be answered!

Many people have talked about their experiences in the sticky above which is what it's for...to help you with your questions.

A quick run through the prescribing information showed no indication of a low WBC. But, that doesn't mean it hasn't happened.