Can you recommend an effective yet "mild" antibiotic for a dental infection for a person sensitive to antibiotic side-effects like upset stomach. I've been taking Flagyl on my dentist's wisdom but it upsets my stomach and generally makes me feel lousy. Once tried something else (can't remember what) that "everyone else" takes without problems and, besides stomach upset, it also caused internal bleeding rectally that really scared me. Other than recent dental infection problems associated with implant procedure, I've never been sick in my life, don't take any medications, at 67.