Every antibiotic if you read the fine print will tell you in the packet
that anything from minor to very severe modificaton to the digestive
system will occur.
It is however, preferable to death from septicimea, or the pain of a
severe abscessed tooth for example.
The doctor won;t give you antibiotics if you don't go and see him, and
will in fact not give them to you if you are prepared to level with him
and say that you prefer not unless strictly necessary.
I had a very deep splinter, and I had to get assistance in extracting
it. Since I was running a slight fever as a result, I got a tetanus
booster, and a very potent antibiotic. Yes, I has stomach cramps for 4
days of the course. Yes, I knew why, yes, teh doctor insisted. Yes, I
stopped taking tehm.
No go away and play somewhere else. Understanding risks and medical
issues is what D-I-Y is all about (speaking froimUK.d-i-y) so take yoir
poloitically slanted scaremeongering somewhere else.