t know if your weakness is caused by the
antibiotics, the
UTI, both, neither, all the meds your taking, all the above, none of the above..........My first inclination is to say no, it's not the antibiotics, but I'm not qualified to answer that. I've personally never felt any side effects from antibiotics except, perhaps, a bit of stomach upset, but it's been a long time since I was on any.
I would suggest you call your prescribing doctor and ask him/her.