Background and Aims: Proton pump inhibitors are effective at reducing heartburn. No studies have evaluated their efficacy in Ramadan. Dexlansoprazole has a unique active formulation independent of time-of-day dosing or food. The aim is to investigate the efficacy of dexlansoprazole 60 mg during Ramadan in patients with symptomatic heartburn. Methods: Subjects recruited using poster, radio, and SMS advertisements completed a diary using a mobile-friendly application and received daily SMS reminders. Dexlansoprazole was started on day 8 for 3 weeks. No placebo arm was used in this trial. Primary endpoint was relief of heartburn expressed as mean 24-h free heartburn percentage (24FH%) per weekly period. Results: A total of 32 patients were enrolled. During week 1, only 1 person (3.1%) was heartburn-free and mean 24FH% was 41.1 ± 24.8%. On dexlansoprazole, mean 24FH% rose to 63.4 ± 23.8 and 81.6 ± 24.5% in weeks 2 and 4, respectively (p < 0.001 for both). Median 24FH% increased from 35.7% in week 1 to 71.4 and 85.7% in weeks 2 and 4, respectively. Mean Gastroesophageal Reflux Disease Questionnaire (GERDQ) scores decreased from 10.0 ± 3.2 in week 1 to 6.53 ± 2.2 in week 2 (p < 0.001) and 5.87 ± 2.1 in week 4 (p < 0.001). Mean heartburn severity score decreased from 2.5 ± 1.0 to 1.7 ± 0.8 (p = 0.001). Early response was higher in patients with GERDQ scores ≥8 (p = 0.012). Conclusion: Dexlansoprazole is effective in the treatment of heartburn during Ramadan. number: NCT03079050.

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