I find it interesting of all these meds. many asthmatics are allergic to. Well, I did not know I had any drug allergies until I got sick with pneumonia, which made thea asthma worse. I was so bad, my allergist put me on 40mg of Prednisone and 400mg of Avelox. She could not give me generic because it was not strong enough, so I ended up having an reaction to the Avelox, which made me itch all over my whole body for a week or so. I was going crazy! When I stopped taking the Avelox the itching cleared up in like two days, I was SO relieved!!!