The Efficacy of Peppermint Oil for the Treatment of Irritable Bowel Syndrome: A Systematic Review and Meta-Analysis

Abstract

Introduction: Irritable Bowel Syndrome (IBS) is a functional gastrointestinal disorder characterized by abdominal pain and altered bowel habits. Peppermint oil is a commonly used natural remedy due to its antispasmodic properties. This review assesses its effectiveness in treating IBS symptoms.

Methods: A search of MEDLINE and the Cochrane Library was conducted for RCTs published up to December 2019 comparing enteric-coated peppermint oil to placebo in adult IBS patients. The primary outcomes were global improvement of symptoms and reduction in abdominal pain.

Results: Twelve RCTs with 835 patients were included. The meta-analysis showed that peppermint oil was significantly more effective than placebo for global symptom improvement (Number Needed to Treat [NNT] = 3) and for reducing abdominal pain (NNT = 4). The risk of adverse events like heartburn was higher in the peppermint oil group but generally mild.

Discussion: Peppermint oil is an effective short-term treatment for IBS, particularly for abdominal pain. The enteric coating is crucial to prevent upper gastrointestinal side effects. The results are robust across multiple high-quality studies.

Conclusion: Evidence from before 2020 strongly supports the use of enteric-coated peppermint oil as a first-line therapy for the symptomatic relief of Irritable Bowel Syndrome.