Re: UTI every time I have sex.
I take macrobid after sex. I was on trimethoprim, but was getting frequent yeast infections. Macrobid is supposed to help with that (& it has for the 2 months I've been on it). Also, I'm trying to get pregnant & macrobid is safer for that as well. The number of milligrams is going to vary depending on what antibiotic your doctor prescribes. Oh, and if you don't have insurance, macrobid is much more expensive than trimethoprim. I have to pay for it myself (about $90 for 30 pills), but it's worth it for me.