You should know about metronidazole: "Flagyl or Metronidazole is the effective modern antibiotic. If absolutely necessary. Metronidazole should be stored at room temperature and protected from light. Metronidazole is an imidazole antibiotic that is used in the first trimester of pregnancy. If absolutely necessary. Metronidazole comes as a tablet to take by mouth. Metronidazole is a valuable antibiotic and is generally well tolerated with appropriate use."