Greetings, I am close to starting on Tobi but my pharmacist, the drug's manufacturer Chiron and my common sense, tell me to proceed with extreme caution. I have had a severe reaction to Neomycin ear drops, ie. swollen and "burned" skin of the ear and surrounds. Neomycin and Tobi are both aminoglycosides. I called my doctor about my concerns and she told me that I should have no problems with the inhaled Tobi....what say ye out there? Thank you so much. Paul