I haven't necessarily had hearing loss associated w/ these drugs, but I do think especially w/ gentamycin that that can be a side effect. W/ the TOBI is hearing loss or just ringing in the ears, or both listed as side effects??I no longer take TOBI because after a few years of use, I started to get so short of breath (SOB) during my TOBI cycle & haven't had any SOB since I discontinued the use of TOBI. Of course, this was just me, probably not many other people have this reaction to TOBI.