Updated Guideline Recommends Selective Antibiotic Use for Outpatient Diverticulitis Management

A new evidence-based guideline outlines practical recommendations for the outpatient management of colonic diverticulitis, emphasizing confirmation of diagnosis with computed tomography (CT), selective use of antibiotics, and lifestyle interventions to reduce recurrence.

The guideline addresses key aspects of outpatient care, including diagnosis, expected disease course, risk factors, antibiotic use, prevention strategies, and appropriate follow-up after recovery.

The authors recommend CT imaging to confirm diverticulitis, particularly during the first presentation and in patients with severe disease. Following recovery, colonoscopy is recommended for patients with complicated diverticulitis and suggested for patients with uncomplicated disease who have alarm symptoms or are not current with colorectal cancer screening to exclude underlying malignancy.

The guideline also highlights patterns of disease recurrence. Patients managed without surgery remain at substantial risk for future episodes, with recurrence risk increasing after each event. However, the authors note that “complicated diverticulitis most often occurs at the initial presentation,” underscoring the importance of careful evaluation during the first episode.

One of the most significant recommendations concerns antibiotic stewardship. Based on evidence from randomized trials, the guideline states, “Because randomized trials show little or no benefit, we suggest against routine antibiotics for low-risk patients with acute uncomplicated diverticulitis.” Instead, antibiotics are recommended for patients with high-risk features, those who are immunocompromised or frail, or those for whom safe outpatient management cannot be ensured.

The guideline also recommends counseling patients on strategies to reduce recurrence. Suggested measures include maintaining a healthy diet without avoiding nuts, seeds, corn, or popcorn, engaging in regular physical activity, achieving or maintaining a healthy weight, avoiding smoking and heavy alcohol use, and limiting nonsteroidal anti-inflammatory drug use when possible.

For patients with recurrent uncomplicated diverticulitis that substantially impairs quality of life, referral for surgical consultation to discuss elective colon resection is advised.

Reference
Peery AF, Strate LL, Stollman N, Mankaney G, Chang JW, Grover S. ACG clinical guideline: colonic diverticulitis. Am J Gastroenterol. 2026;121(7):1549-1561. doi:10.14309/ajg.0000000000004047