Urethritis

A 55-year-old male rock musician comes to the clinic because of dysuria, urgency, and urinary frequency. He also notes that his urine has appeared pink. He has not had fever, chills, back pain, or vomiting. His symptoms began several days ago, but he tried to ignore them because he was on tour. He reports having several sexual partners over the past year. Examination shows a small amount of purulent discharge from the urethral meatus. Which of the following empiric treatments is most appropriate?