I was on neomycin for 28 days. I did not take it concurrently with rifaximin, but I have taken that one in the past and neomycin was worse. That said, conventional antibiotics like doxy and cipro are worse than either neomycin or rifaximin.

That said, and as respectfully as possible, you have gotten the same answer a half dozen times, any specific context about your specific condition, age, or constitution that makes you so neurotic? If you actually have SIBO, Western medicine has no better solution than neo + rif, I hop you have a doctor you trust not to prescribe you something that would turn you blue, punch your ticket and take the ride.