otitis media
"I have a lot of ear infections due to an ENT issue and have been prescribed this twice in the past year.  Both times it gave me horrible, vivid nightmares.  It also leaves a horrible taste in the mouth for a few hours after taking a dose and I seem to pee a lot for the first couple of hours too.

It seems to work but I think I'd prefer another anti-biotic due to the above issues."