Hi,
I have that fight with all medications but when SIBO gets to the point I thought would die, I had to suck it up and mitigate my health. The meds are not pleasant but that is all that will kill off SIBO. It is amazing what you can put up with when you have no alternative. Had they not worked then the alternative is hugely expensive and more aggressive with a special formula diet. It is just a 2 week course with a modified diet. They can prescribe anti nausea medication and anti vertigo medication which I was grateful for. I got to the point with SIBO that I could not eat or drink without an explosive reaction, the reaction to the medication was the lesser of two evils for sure.
Good luck.
Cheers