<s>[INST] My husband has an infected back molar and the dentist we havent seen before has prescribed him with both Amoxycillin 500mg and Metronidazole 400mg to be taken 3x daily for one week.  I am worried that this is powerful combination as he has not had antibiotics in the 6 years I have known him.  Please advise [/INST] Hi. Welcome to Chat Doctor. I read your query. The antibiotics you got a prescription of are a God combination for large periapical tooth abscess and is meant to cover up infection by all kinds of bacteria. Your husband has infected molar but how much pus does he have required an x-ray to be done. Is there some pus or boil on gum? Also, these Chat Doctor.  So its is preferred to take antacid like Antacid DSR or Radical DSR one hour before meals two times a day and then take these  </s>