Dear buddy amikacin and tobi both r from same family..doc dont want to use it for inhalation bcoz they want to use it as iv injection..if u use amikacin for inhaltion u will develop resistance and will be in trouble .it is used as 2nd line of defence when you dnt respont to oral and inhaled antibioticlevofloxcin is under last stages of trial and i think it wil be ok. if u can get it use it.Colistin is also used i dnt prefer colistin its v toxic ..i will use it if none of antibiotic help me.Now i also want to tell you that last yr tobi killed me..and i switched to oral levo 500 mg with azithromycin 250 mg..from then my sputum culture does not show pseudoI advice you to eat a lot of protein it works better than any antibiotic ..also get ur iron checked ..mny cf ppl are iron deficient
"Dear buddy amikacin and tobi both r from same family"
Not really relevant. Germs can have resistance to specific antibiotics within the same family. Back when I still cultured pseudomonas, it was sensitive to gentamicin and tobramycin, but intermediate to amikacin.
"if u use amikacin for inhaltion u will develop resistance and will be in trouble "
That's a risk with any antibiotic, not just amikacin. Also, nebbing antibiotics drastically reduces the chance that you'll become resistant vs. IV or oral administration, since oral and IV administration results in a much lower lung concentration, meaning a resistant mutant could more easily arise. Nebbed administration results in sputum concentrations upwards of 100x MIC due to all of the antibiotic being deposited in your lungs.
"i dnt prefer colistin its v toxic "
It's only toxic if administered IV. Nebbing it drastically reduces the toxicity by limiting systemic exposure. It'll cause bronchospasms nebbed, but it won't fry your nerves or your kidneys that way. Even the IV toxicity is overstated and comes from old studies done in the 60's when they were giving massive, massive doses of IV colistin. It's more toxic than aminoglycosides (which are the drugs it was replaced by for serious gram negative infections), but it turns out that you also don't need as large of a dose to achieve similar efficacy, so it all evens out.
"I advice you to eat a lot of protein it works better than any antibiotic"
Wrong.
The next time you're sick with a CF exacerbation, stop all your antibiotics and just eat a bunch of protein. Tell us how that works out for you, if you live.