Objectives: We investigate the effects of Ginger, compared to the usual therapeutic regimen on clinical manifestations and paraclinical features in patients with confirmed COVID-19 that are moderately ill. Trial design: This is a single center, randomized, double-blind, placebo-controlled clinical trial with parallel group design. Participants: Inclusion criteria: 1. Patients admitted to Severe Acute Respiratory Syndrome (SARS) Departments at Shahid Mohammadi Hospital, Bandar Abbas, Iran 2. Age ≥18 years (weight ≥35 kg) 3. Hospitalized ≤48 hours 4. Confirmed SARS-CoV-2 diagnosis (Positive polymerase chain reaction (PCR)) 5. Moderate pneumonia and lung involvement in imaging 6. Signing informed consent and willingness of study participant to accept randomization to any assigned treatment arm Exclusion criteria: 1. Underlying diseases, including heart disease, chronic hypertension, severe renal failure, severe liver failure, and thyroid disorders 2. Use of warfarin, selective serotonin reuptake inhibitors (SSRIs), monoamine oxidase inhibitors (MAOIs), diuretics, corticosteroids, and antiarrhythmic drugs 3. Severe and critical pneumonia 4. History of known allergy to Ginger 5. Pregnancy and breastfeeding Intervention and comparator: Intervention group: The standard treatment regimen for COVID-19 along with Ginger-based herbal tablets (Vomigone ®, Dineh Pharmaceutical Company, Iran) at a dose of 1000 mg three times a day for a period of seven days. Control group: The standard treatment for COVID-19 based on the Iranian Ministry of Health and Medical Education's protocol, along with Vomigone-like placebo tablets (Dineh Pharmaceutical Company, Iran) at a dose of two tablets three times a day for a period of seven days. Main outcomes: The primary outcome is recovery rate of clinical symptoms, including fever, dry cough, tiredness, and GI symptoms as well as paraclinical features, including thrombocytopenia, lymphocytopenia, and C-reactive protein within seven days of randomization. Time to improvement of clinical and paraclinical features along with the incidence of serious adverse events are the secondary outcomes within seven days of randomization. Randomization: An interactive web-based system will be used to allocate eligible participants, based on the inclusion and exclusion criteria, to one of the two study arms (in a 1:1 ratio) using block randomization. Blinding (masking): All study participants, research coordinators, clinicians, nurses, and investigators will be blinded to the group assignment. Numbers to be randomized (sample size): A total of 84 participants will be randomized into two groups of 42 patients. Trial Status: The protocol is Version 1.0, May 23, 2020. Recruitment began July 21, 2020, and is anticipated to be completed by October 30, 2020. Trial registration: This clinical trial has been registered in the Iranian Registry of Clinical Trials (IRCT). The registration number is “IRCT20200506047323N1”. Registration date is 23 May 2020. Full protocol: The full protocol is attached as an additional file, accessible from the Trials website (Additional file 1). In the interest in expediting dissemination of this material, the familiar formatting has been eliminated; this Letter serves as a summary of the key elements of the full protocol.

Objectives: We will evaluate the efficacy and safety of Melatonin, compared to the standard therapeutic regimen on clinical symptoms and serum inflammatory parameters in patients with confirmed COVID-19, who are moderately ill. Trial design: This is a single-center, randomized, double-blind, placebo-controlled clinical trial with a parallel-group design conducted at Shahid Mohammadi Hospital, Bandar Abbas, Iran. Participants: All patients admitted to Severe Acute Respiratory Syndrome Departments of Shahid Mohammadi Hospital, Bandar Abbas, Iran will be screened for the following criteria. Inclusion criteria: 1. Age ≥20 years 2. Confirmed SARS-CoV-2 diagnosis (positive polymerase chain reaction). 3. Moderate COVID-19 pneumonia (via computed tomography and or X-ray imaging), requiring hospitalization. 4. Hospitalized ≤48 hours. 5. Signing informed consent and willingness of the participant to accept randomization to any assigned treatment arm. Exclusion criteria: 1. Underlying diseases, including chronic hypertension, diabetes mellitus, seizure, depression, chronic hepatitis, cirrhosis, and cholestatic liver diseases. 2. Severe and critical COVID-19 pneumonia. 3. Use of warfarin, corticosteroids, hormonal drugs, alcohol, other antiviral and investigational medicines, and illegal drugs (during the last 30 days). 4. History of known allergy to Melatonin. 5. Pregnancy and breastfeeding. Intervention and comparator: Intervention group: The standard treatment regimen for COVID-19, according to the Iranian Ministry of Health and Medical Education's protocol, along with Melatonin capsules at a dose of 50 mg daily for a period of seven days. Control group: The standard therapeutic regimen for COVID-19 along with Melatonin-like placebo capsules at a dose of one capsule daily for a period of seven days. Both Melatonin and placebo capsules were prepared at the Faculty of Pharmacy and Pharmaceutical Sciences, Hormozgan University of Medical Sciences, Bandar Abbas, Iran. Main outcomes: The primary outcomes are the recovery rate of clinical symptoms and oxygen saturation as well as improvement of serum inflammatory parameters, including C-reactive protein, tumor necrosis factor-alpha (TNF-ɑ), interleukin-1β (IL-1β), and IL-6 within seven days of randomization. The secondary outcomes are the time to improve clinical and paraclinical features along with the incidence of serious adverse drug reactions within seven days of randomization. Randomization: Included patients will be allocated to one of the study arms using block randomization in a 1:1 ratio (each block consists of 10 patients). This randomization method ensures a balanced allocation between the arms during the study. A web-based system will generate random numbers for the allocation sequence and concealment of participants. Each number relates to one of the study arms. Blinding (masking): All study participants, clinicians, nurses, research coordinators, and those analyzing the data are blinded to the group assignment. Numbers to be randomized (sample size): A total of 60 patients randomized into two groups (30 in each group). Trial Status: The trial protocol is Version 1.0, August 14, 2020. Recruitment began August 22, 2020, and is anticipated to be completed by November 30, 2020. Trial registration: The trial protocol has been registered in the Iranian Registry of Clinical Trials (IRCT). The registration number is “IRCT20200506047323N5”. The registration date was 14 August 2020. Full protocol: The full protocol is attached as an additional file, accessible from the Trials website (Additional file 1). In the interest in expediting the dissemination of this material, the familiar formatting has been eliminated; this Letter serves as a summary of the key elements of the full protocol.

Objectives: We investigate the effects of Licorice (Glycyrrhiza glabra L.) root extract, an anti-inflammatory natural medicine, compared to the usual therapeutic regimen on clinical symptoms and laboratory signs in patients with confirmed COVID-19 that are moderately ill. Trial design: This is a single-center, open-label, randomized, clinical trial with parallel-group design. This study is being conducted at Shahid Mohammadi Hospital, Bandar Abbas, Iran. Participants: Both male and female patients with ≥18 years of age (≥ 35 kg of weight), admitted at the Shahid Mohammadi Hospital, Hormozgan University of Medical Sciences, Bandar Abbas for treatment, screened for the following criteria. Inclusion criteria: 1. Confirmed diagnosis of SARS-CoV-2 infection (via polymerase chain reaction [PCR] and/or antibody test). 2. Presenting as moderate COVID-19 pneumonia (via chest computed tomography (CT) and/or X-ray) requiring hospitalization. 3. Hospitalized ≤48 hours. 4. Signing informed consent and willingness of study participant to accept randomization to any assigned treatment arm. Exclusion criteria: 1. Underlying diseases, including chronic heart disease, chronic hypertension, severe renal failure, severe liver failure, and thyroid disorders. 2. Severe and critical COVID-19 pneumonia. 3. Use of warfarin, selective serotonin reuptake inhibitors (SSRIs), monoamine oxidase inhibitors (MAOIs), diuretics, corticosteroids, and antiarrhythmic drugs. 4. Treatment with Investigational and antiviral therapy in a clinical study within one month before randomization. 5. History of allergy to Licorice. 6. Pregnancy and breastfeeding. Intervention and comparator: Intervention group: The standard treatment regimen for COVID-19 along with a Licorice-based herbal preparation (D-Reglis ®, Irandarouk Pharmaceutical Company, Iran) at a dose of 760 mg three times a day for a period of seven days. Control group: The standard treatment for COVID-19 based on the Iranian Ministry of Health and Medical Education's protocol for a period of seven days. Main outcomes: The recovery rate of clinical symptoms, including fever, dry cough, and tiredness, as well as paraclinical features, including thrombocytopenia, lymphocytopenia, and C-reactive protein, are evaluated as primary outcomes within seven days of randomization. Time to improvement of clinical and paraclinical features and length of stay in a hospital, along with the incidence of adverse reactions are also evaluated as the secondary outcomes within seven days of randomization. Randomization: An electronic table of random numbers will be used to allocate the included participants into either control or intervention groups (in a 1:1 ratio) using the simple randomization method. Blinding (masking): This is an open-label trial without blinding and placebo control. Numbers to be randomized (sample size): A total of 60 participants randomizes (30 patients allocated to the intervention group and 30 patients allocated to the control group). Trial Status: The protocol is Version 1.0, May 31, 2020. Recruitment began July 30, 2020, and is anticipated to be completed by October 30, 2020. Trial registration: This clinical trial has been registered in the Iranian Registry of Clinical Trials (IRCT). The registration number is “IRCT20200506047323N2”, https://www.irct.ir/trial/47990. The registration date is 31 May 2020. Full protocol: The full protocol is attached as an additional file, accessible from the Trials website (Additional file 1). In the interest in expediting dissemination of this material, the familiar formatting has been eliminated; this Letter serves as a summary of the key elements of the full protocol.

Objectives: We investigate the effects of melatonin, compared to the usual therapeutic regimen on clinical symptoms and laboratory signs in severely ill patients with confirmed COVID-19 who are admitted to the Intensive Care Unit (ICU). Trial design: This is a single-center, open-label, randomized, clinical trial with a parallel-group design. This study is being conducted at Shahid Mohammadi Hospital, Bandar Abbas, Iran. Participants: All patients admitted to the ICU of Shahid Mohammadi Hospital, Bandar Abbas, Iran, will be screened for the following criteria. Inclusion criteria 1. Age >20 years 2. Definitive diagnosis of COVID-19 based on RT-PCR or/and serological testing 3. Severe pneumonia and lung involvement in imaging 4. Signing informed consent Exclusion criteria 1. Underlying diseases, including convulsive disorders, chronic hepatic and renal diseases 2. Use of mechanical ventilation 3. History of known allergy to Melatonin 4. Pregnancy and breastfeeding Intervention and Comparator: Intervention group: The standard treatment regimen for COVID-19, according to the Iranian Ministry of Health and Medical Education’s protocol, along with Melatonin soft gelatin capsule (Danna Pharmaceutical Company) at a dose of 5 mg twice a day for a period of seven days. Control group: The standard treatment for COVID-19 based on the Iranian Ministry of Health and Medical Education’s protocol for a period of seven days. Main outcomes: The primary outcomes are the recovery rate of clinical symptoms and checking arterial blood gas (ABG), C-reactive protein (C-RP), Ferritin, Lactate dehydrogenase (LDH) within seven days of randomization. The secondary outcomes are time to improvement of clinical and paraclinical features and length of stay in the ICU, need for mechanical ventilation, and mortality rate within seven days of randomization. Randomization: Included patients will be allocated to one of the study arms using block randomization in a 1:1 ratio (each block consists of 6 patients). This randomization method ensures a balanced allocation between the arms during the study. A web-based system will generate random numbers for the allocation sequence and concealment of participants. Each number relates to one of the study arms. Blinding (masking): This is an open-label trial without blinding and placebo control. Numbers to be randomized (sample size): A total of 60 participants randomizes (30 patients allocated to the intervention group and 30 patients allocated to the control group). Trial Status: The protocol is Version 1.0, February 16, 2021. Recruitment began February 28, 2021, and is anticipated to be completed by July 31, 2021. Trial registration: The trial protocol has been registered in the Iranian Registry of Clinical Trials (IRCT). The registration number is “IRCT20200506047323N7”. The registration date was February 16, 2021. Full protocol: The full protocol is attached as an additional file, accessible from the Trials website (Additional file 1). In the interest of expediting the dissemination of this material, the familiar formatting has been eliminated; this Letter serves as a summary of the key elements of the full protocol.