I'm interested in this, too. Since the birth of my daughter, I've had issues with high blood pressure and have been wondering about switching from albuterol to xopenex and if that would make a difference. I have always suffered from the jittery feeling of albuterol and (embarassingly) didn't know there was another option. And I've mentioned the jitters to my doctor before! The first I had heard of xopenex was from a friend whose baby takes it (with a traech, not cf related) and recently read posts on this forum of cfers taking it.
Christian, I am breastfeeding my daughter also and read in "The Breastfeeding Book" by Dr. Sears and his wife Martha (an RN) that albuterol is safe while nursing. There is no mention of xopenex, specifically, but it does say generally that inhaled bronchodilaters are safe. I plan to ask about these meds at my cf appointment next Tuesday.