Nitrofurantoin
urinary tract infection
"Before your freak out thinking that you're gonna have the worst experience ever on this drug, don't! Most people who have good experiences don't come to these sites and write reviews, it's always the bad ones! I have terrible health anxiety and I'm sensitive to  lots of drugs. I also had C diff 3 months ago (cured by at home Fecal Microbiota Transplantation) so taking an antibiotic again was pretty scary for me. 
The side effects I got were a slight headache and nausea for a couple hours after each pill, some gas but no other digestive issues (thank goodness!!!). I was feeling better on the 4th day and have one more day to go. Take it with bread to make it easier on your stomach."