A 24-year-old patient presents to your office with complaints of a 1 -week history of vulvar itching and vaginal discharge. She endorses that she has had intercourse with two individuals in the past 6 months without the use of a condom. On physical examination, the vulva is edematous. Yellow-green discharge is present on the vaginal walls and at the cervical os. The cervix is strawberry red Wet smear of vaginal secretions shows epithelial cells, white blood cells (WB Cs), and flagellate protozoa. You prescribe an antibiotic. What warning do you give about this particular treatment?

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