Hello. Just had knee surgery, and am having a reaction to one or more medicines I m taking. I get exceptionally short of breath, even after using Ventolin and Benedryl. But much later the signs go away. So I m wondering which of these medicines are causing the problem. Medicines are Metoprolol, Torsemide, Aspirin, Oxycodone, as well as several others. Can you see any reason to suspect medicine interactions?