I am on Colistin, 75mg twice a day (when acutely ill, docs bump it up to 150 twice a day) and have been on it for years as well. TOBI just wasn't doing it's job, so we decided to switch....I think I'm doing better with Colistin. I grow out PA, resistant as well as other bugs (Steno, Staph, and at times Achromobacter X. ) I haven't had too many adverse reactions with the Colistin, except for hoarseness and it is a weird tasting neb.
Jenn 40 WCF