Melatonin in the Prophylaxis of SARS-CoV-2 Infection in Healthcare Workers (MeCOVID): A Randomised Clinical Trial
Pierachille Santus, Michela Sabbatucci, Irene García-García, Enrique Seco-Meseguer, Pilar Ruiz-Seco, Ge Navarro-Jimenez, Raúl Martínez-Porqueras, María Espinosa-Díaz, Juan José Orte-Albás, Iñigo Sagastagoit, María Teresa García-Morales, María Jiménez-González, Lucía Martínez De Soto, Ana Isabel Bajo-Martínez, María Del Palacio-Tamarit, Raquel López-García, Lucía Díaz-García, Javier Queiruga-Parada, Christi Giesen, Ana Pérez-Ville, Marta De Castro-Martínez, Juan J González-García, Miguel Rodriguez-Rubio, Pedro De La Oliva, José R Arribas, Antonio J Carcas, Alberto M Borobia
We evaluated in this randomised, double-blind clinical trial the efficacy of melatonin as a prophylactic treatment for prevention of SARS-CoV-2 infection among healthcare workers at high risk of SARS-CoV-2 exposure. Healthcare workers fulfilling inclusion criteria were recruited in five hospitals in Spain and were randomised 1:1 to receive melatonin 2 mg administered orally for 12 weeks or placebo. The main outcome was the number of SARS-CoV-2 infections. A total of 344 volunteers were screened, and 314 were randomised: 151 to placebo and 163 to melatonin; 308 received the study treatment (148 placebo; 160 melatonin). We detected 13 SARS-CoV-2 infections, 2.6% in the placebo arm and 5.5% in the melatonin arm (p = 0.200). A total of 294 adverse events were detected in 127 participants (139 in placebo; 155 in melatonin). We found a statistically significant difference in the incidence of adverse events related to treatment: 43 in the placebo arm and 67 in the melatonin arm (p = 0.040), and in the number of participants suffering from somnolence related to treatment: 8.8% (n = 14) in the melatonin versus 1.4% (n = 2) in the placebo arm (p = 0.008). No severe adverse
Informed Consent Statement: Informed consent was obtained from all subjects involved in the study.
Conflicts of Interest: The authors declare no conflict of interest.
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'abstract': '<jats:p>We evaluated in this randomised, double-blind clinical trial the efficacy of '
'melatonin as a prophylactic treatment for prevention of SARS-CoV-2 infection among healthcare '
'workers at high risk of SARS-CoV-2 exposure. Healthcare workers fulfilling inclusion criteria '
'were recruited in five hospitals in Spain and were randomised 1:1 to receive melatonin 2 mg '
'administered orally for 12 weeks or placebo. The main outcome was the number of SARS-CoV-2 '
'infections. A total of 344 volunteers were screened, and 314 were randomised: 151 to placebo '
'and 163 to melatonin; 308 received the study treatment (148 placebo; 160 melatonin). We '
'detected 13 SARS-CoV-2 infections, 2.6% in the placebo arm and 5.5% in the melatonin arm (p = '
'0.200). A total of 294 adverse events were detected in 127 participants (139 in placebo; 155 '
'in melatonin). We found a statistically significant difference in the incidence of adverse '
'events related to treatment: 43 in the placebo arm and 67 in the melatonin arm (p = 0.040), '
'and in the number of participants suffering from somnolence related to treatment: 8.8% (n = '
'14) in the melatonin versus 1.4% (n = 2) in the placebo arm (p = 0.008). No severe adverse '
'events related to treatment were reported. We cannot confirm our hypothesis that '
'administration of melatonin prevents the development of SARS-CoV-2 infection in healthcare '
'workers.</jats:p>',
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