I'm one day in to taking nitro for uti and have awful body aches and muscle pain and generally feeling absolutely shattered. Has anyone else had this? Don't know if it's just that I had terrible sleep for 2 days of if it's a side effect. I don't usually feel like this on this antibiotic so it's unusual for me. I had a look at the side effects and can't figure out if it's something I should be getting checked out or not. I also have a constant tremor in my lower left calf/achilles tendon.