Q. A 22-year-old man comes to the physician’s office for fatigue and progressive low backache for the past 4 months. He complains of morning stiffness and difficulty waking up from bed. As the day progresses, he feels better with activities. He is a nonsmoker and nonalcoholic. He is sexually active and uses condoms regularly. Past history shows that he got admitted for diarrhea a year ago for a day. His temperature is 98.2°F, heart rate is 83 beats per minute, blood pressure is 110/70 mm of Hg and respiratory rate is 15 per minute. Physical examination shows congestion near the limbus of the right eye. When enquired, he says he hasn’t observed it. Musculoskeletal examination shows a limitation of lateral and anterior flexions of the spine and tenderness present over sacroiliac joints and the posterior surface of the calcaneum in both heels. The erythrocyte sedimentation rate (ESR) is 60 mm/hr. Which of the following is the best next step in this patient’s management based on his clinical features?