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Lan, Shao‐Huan; Lee, Hong‐Zin; Chao, Chien‐Ming; Chang, Shen‐Peng; Lu, Li‐Chin; Lai, Chih‐Cheng
Journal of medical virology, 20/May , Volume: 94, Issue: 5Journal Article
This study investigated the effect of melatonin on clinical outcomes in patients with coronavirus disease 2019 (COVID‐19). We searched PubMed, the Web of Science, the Cochrane Library, Ovid MEDLINE, and Clinicaltrials.gov for randomized controlled trials (RCTs) published before September 11, 2021. Only RCTs that compared the clinical efficacy of melatonin with a placebo in the treatment of patients with COVID‐19 were included. The primary outcome measure was the clinical recovery rate. We included three RCTs in this meta‐analysis. Melatonin 3 mg three times daily was administered in one RCT, and 3 or 6 mg daily before bedtime in the other two trials. Treatment duration was 14 days in two RCTs and 7 days in one trial. The clinical recovery rates were 94.2% (81/86) and 82.4% (70/85) in the melatonin and control groups, respectively. Overall, patients receiving melatonin had a higher clinical recovery rate than did the controls (odds ratio OR: 3.67; 95% CI: 1.21−11.12; I2 = 0%, p = 0.02). The risk of intensive care unit admission was numerically lower in the melatonin group than in the control group (8.3% 6/72 vs. 17.6% 12/68, OR: 0.45; 95% CI: 0.16−1.25; I2 = 0%, p = 0.13), and the risk of mortality was numerically lower in the melatonin group than in the control group (1.4% 1/72 vs. 4.4% 3/68, OR: 0.32; 95% CI: 0.03−3.18; I2 = 0%, p = 0.33). In conclusion, melatonin may help improve the clinical outcomes of patients with COVID‐19. Highlight This study investigated the effect of melatonin on clinical outcomes in patients with coronavirus disease 2019. Patients receiving melatonin had a higher clinical recovery rate than did the controls (odds ratio: 3.67; 95% CI: 1.21−11.12; I2 = 0%, p = 0.02). The risk of intensive care unit admission was only insignificantly lower in the melatonin group than in the control group. The risk of mortality was insignificantly lower in the melatonin group than in the control group.
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