I'm going through the same thing. I went back to the doctor today because I still have the respiratory infection from last week. The Z pack antibiotics and prednisone didn't get it out of me.

Tessalon Perle 100mg is what I'm on today. It's a cough suppressant in a gel ball form. I've only took one dose but I can feel my lungs open up and I can breath better without hacking so much.