Prednisone does not have known reactions with the other meds and is often used along with ventolin.
if you use your ventolin and this is not getting better then you should seek assistance
Prednisone does not typically have breathing side effects, but with longer use it can have heart side effects such as heart failure.
however acute use is very seldom a problem
I would therefore suggest heart and lung
exam at urgent care if this continues
Calling your docs service, etc.
There is no problem stopping it or reducing the dose now...somewhat less treatment of your condition however, and you should discuss with your doc.
Let me know if you have further questions
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