bacterial infection
"My dentist prescribed this awful medicine for a tooth infection.  I made it through the 1st dose but the 2nd caused instantaneous severe heartburn that was so horrendous I vomited everything I had eaten that day.  Sadly that didn't get rid of the heartburn.  3 days later it feels like there's a hole burned into my lower esophagus.  The dentist switched me over to erythromycin but I can't stomach the idea of swallowing another pill when the pain will surely come with it.  Would prefer injections over this nightmare."