Urinary tract infections?
I don't know the answer to whether they are more common after WLS. I know others on the board have been on antibiotics for various reasons, and haven't mentioned an impaired effectiveness because of being post-op.
I haven't had a UTI for years, but I remember what a ***** they can be. I used to get them in my early twenties. Now that I am thinking of it, they used to call it "honeymoon disease". Gee....my surgeon has referred to the first six months post-op as the honeymoon phase. Maybe it is not only the easiest time to lose the weight, but ....well, I'm not suggesting any cause and effect here! Anyways, in addition to the antibiotics, my doctor used to send me home with orders to drink a six pack of beer or large quantities of cranberry juice. Guess which cure I chose? I don't think either of those helpful hints will help you. You don't need to dump on top of it. I would suggest tons of water (like you don't already do that) and getting a second antibiotic.
Patty