An adolescent with pelvic inflammatory disease (PID) is admitted to the hospital after 14 days of taking levofloxacin 500 mg PO daily and metronidazole 500 mg IV piggy back (IVBP) twice daily (BID). She asks the nurse, "Why do I have to be in the hospital? Why can't I get my treatment at home?" Which purpose should the nurse provide that supports an effective outcome?