The limiting effect when utilizing nebulizer
medications is the tachycardia
i.e., rapid heart rate
...that it can cause. I would call your GP or see a pediatric pulm doc and see if you can get Xopenex instead of the nebulizer medication you are using...the other name for Xopenex is Levalbuterol. Xopenex does not cause nervousness
or a rapid heart rate. It was actually developed initially to be used in pre-mature infants.