UTI Medication: anyone taken this to prevent UTI?

Hi ladies! In July, I had 3 UTI’s. Just in that month. It was TERRIBLE. No idea how it even happened. My OBGYN prescribed me to take this every time after sex, but I am kind of a hypochondriac and try my best to never put things into my body. Has anyone ever taken this medication? Especially after sex like I was prescribed? Would love to hear your experiences. I may decide to not go through with it! XX ❤️❤️❤️