I been taking ALBUTEROL in a nebulizer for Wheezing an for Asthma that got worse from a Upper Respiratory infection,I never have gotten any bad side effects from being on this medication,I have used it a lot threw the years,times a box a week,2-3viles a day,this medicine does work and stops wheezing,and opens up the air passages! You could get shaky from using it but only if you use too much at a time,go by what dr. tells you how much to use.