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This is Dr. David
there are no drug interactions between erythromycin and metronidazole.
but you might want to take a probiotic daily as well to decrease risks from antibiotics.
I hope your toothache gets better
let me know if you have other questions.
if done , please leave positive rating below the chat box so I can get credit you todayyou can always reach me with "a question . David" if you have any other questionshere is my website if you need to reach me again:http://www.justanswer.com/medical/expert-dr-david/Thanks JustAnswers.com
thanks