Efficacy of Melatonin in the Prophylaxis of Coronavirus Disease 2019 (COVID-19) Among Healthcare Workers.

Study Overview
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Brief Summary
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There is an urgent need to evaluate interventions that can prevent the infection with SARS-CoV 2 of healthcare workers at risk. Melatonin is an inexpensive and safe product with protective effect in both bacterial and viral infections likely due to its anti-inflammatory and anti-oxidative effects. This randomized controlled trial seeks to evaluate is efficacy as a prophylaxis in healthcare workers exposed to the virus in their clinical practice.

Detailed Description
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Healthcare workers are at an increased risk of acquiring COVID-19 due to an increased exposure to the virus and global personal protective equipment shortages. Preventing the infection of healthcare workers is critical the current epidemic situation when healthcare systems are under extreme pressure. There is a lack of evidence surrounding potential preventive strategies to decrease the incidence of COVID-19 among healthcare workers. Melatonin, an endogenous hormone involved in circadian rhythm control, is an inexpensive and safe product that has shown protective effects in bacterial and viral infections likely due to its anti-inflammatory and anti-oxidative effects. SARS-CoV 2 seems to relatively spare younger children and those who are infected develop the severe forms of the disease very rarely. Peak melatonin serum levels are higher in younger children and decrease with age. These levels are also higher in women, specially during pregnancy, who also seem to be less affected by the virus when compared to men. The investigators hypothesize that elevating peak melatonin levels to a range similar to that of children by administering 2 mg of melatonin daily might prevent the infection with SARS-CoV 2 among exposed healthcare workers. The investigators also hypothesize that among those who develop the disease melatonin might prevent the more severe forms.

Official Title
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Multicenter Randomized Controlled Trial of the Efficacy of Melatonin in the Prophylaxis of SARS-coronavirus-2 Infection Among High Risk Contacts.

Conditions
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SARS-CoV 2, Coronavirus Infection, Covid19

Intervention / Treatment
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* Drug: Melatonin 2mg
* Drug: Placebo oral tablet


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthcare workers from the public and private Spanish hospital network at risk of SARS-CoV 2 infection Not having a previous COVID19 diagnosis Not having experienced COVID19 symptoms from March 1st 2020 until randomization Understanding the purpose of the trial and not having taken any pre-exposure prophylaxis (PrEP) including HIV PrEP from March 1st 2020 until randomization Having a negative SARS-CoV 2 CRP before randomization Having a negative urinary pregnancy test in the previous 7 days for premenopausal women Premenopausal women and males with premenopausal couples must commit to using a high efficiency anticonceptive method Exclusion Criteria: HIV infection Active hepatitis B infection Renal failure (CrCl < 60 mL/min/1.73 m2) or need for hemodialysis Osteoporosis Myasthenia gravis Retinitis pigmentosa Bradycardia (less than 50 bpm) Weight less than 40 Kg Treatment with drugs that prolong the QT interval for more than 7 days in the last month before randomization including: azithromycin, cisapride, methadone, droperidol, sotalol, quinidine, clarithromycin, haloperidol... Hereditary intolerance to galactose, Lapp lactase deficiency or glucose or galactose malabsorption Treatment with fluvoxamine Treatment with benzodiazepines or benzodiazepine analogues such as zolpidem, zopiclone or zaleplon Pregnancy Breastfeeding History of potentially immune derived diseases such as: lupus, Crohn's disease, ulcerative colitis, vasculitis or rheumatoid arthritis Insulin-dependent diabetes mellitus Known history of hypersensitivity to the study drug or any of its components Patients that should not be included in the study at the judgment of the research team

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Melatonin<br>2 mg of melatonin orally before bedtime for 12 weeks | Drug: Melatonin 2mg<br>* 2 mg of prolonged release melatonin tablets per os (P.O.) before bedtime for 12 weeks<br>* Other names: circadin 2 mg;|
| Placebo Comparator: Placebo<br>Identically looking placebo orally before bedtime for 12 weeks | Drug: Placebo oral tablet<br>* Identically looking placebo tablets P.O. before bedtime for 12 weeks<br>* Other names: Placebo;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| SARS-CoV 2 infection rate | Number of confirmed (positive CRP) symptomatic infections in each treatment group | up to 12 weeks | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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melatonin, prevention, covid19, Sars-CoV2, healthcare