I had been taking Amoxicillin for two and a half month without the Flagyl. I added the Flagyl two weeks ago and now, my doctor wants me to continue Flagyl but switch to Biaxin instead of the Amox... is there a difference between these two combos? I also feel that the Flagyl is giving me severe tachycardia. Any suggestions? Thanks, Posted by bigstan (Member # 11699) on :