A 28-year-old woman presents to the sexually transmitted infection (STI) clinic with a 3-day history of dysuria, urethral discharge (purulent, greenish), and lower abdominal pain. She reports unprotected intercourse with a new partner 5 days ago. On urethral smear Gram stain, intracellular Gram-negative diplococci are seen within polymorphonuclear leukocytes. Nucleic acid amplification test (NAAT) for *Neisseria gonorrhoeae* is pending. What is the most appropriate treatment regimen?