I Have CLL & I Have Been On Chemo Since

I have CLL & I have been on chemo since Feb. 7,2015. I am going to start a 4 wk regiment of Rituxan I wanted to look it up to check the possible side effects. I have a long list of other medical issues & I am wondering if that plays a part in my reaction to these meds. I did ok with just Fludarabine but not when they added Cytoxan. The Fludarabine will drop my white count but only for a week. So this past Monday was 3 weeks. ago they changed to Treanda I do not tolerate it well at all but it did drop the white count & hold it. So are the side effects of Rituxan similar to the drugs that I have been on?