urinary tract infection
"Am allergic to penicillin & more recently Keflex -a not uncommon occurrence in those with penicillin allergy. Prior to allergy, Keflex was  slow to work & caused nausea whether taken mid meal or on an empty stomach. I've used Levaquin for stubborn sinus infections & more recently my first UTI. The first time I took it, I experienced muscle soreness. With each subsequent prescription the side effects have vanished & it's efficaciousness has not diminished .Of note for those who give up on it due to nausea & muscle aches: hydration  helps reduce the symptoms. This med is not for those with certain heart issues or on some meds for mental health diagnosis."