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NCT04828564 | Not yet recruiting | SARS-CoV2

Efficacy and Safety of Favipiravir and Ribavirin Formulation for Treatment of COVID-19

The Scientific and Technological Research Council of Turkey

Information provided by (Responsible Party):

Alpay Azap

Brief Summary:

This is a national, multicenter, open-label, randomized, phase II/III trial that evaluates the efficacy and safety of favipiravir and ribavirin in the treatment of patients with confirmed COVID-19 observed within 72 hours. Approximately 100 patients will be randomized in 1:1 ratio and divided into two groups.

Condition or disease




Ribavirin Capsules



Phase 2

Phase 3

Detailed Description:

The clinical picture of COVID-19 disease is in a broad spectrum, which includes asymptomatic infection, a mild upper respiratory tract infection, respiratory failure, and even severe viral pneumonia with death. The alarming levels of spread and severity of COVID-19 caused a global emergency and this outbreak has been characterized as a pandemic by the World Health Organization (WHO). Coronavirus entry into host cells is an important determinant of viral infectivity and pathogenesis. SARS-CoV S1 contains a receptor-binding domain (RBD) that specifically recognizes angiotensin-converting enzyme 2 (ACE2) as its receptor. SARS-CoV spike needs to be proteolytically activated at the S1/S2 boundary, such that S1 dissociates and S2 undergoes a dramatic structural change. These SARS-CoV entry-activating proteases include cell surface protease TMPRSS2 and lysosomal proteases cathepsins. These features of SARS-CoV entry contribute to its rapid spread and severe symptoms and high fatality rates of infected patients. Ribavirin is a guanosine analog that interferes with the replication of RNA and DNA viruses. Ribavirin was used during the Severe Acute Respiratory Syndrome (SARS) outbreak in combination with corticosteroids, which have an anti-inflammatory effect. Favipiravir is a substrate for viral RNA-dependent RNA polymerase (RdRp) and showed anti-influenza virus activity. Favipiravir is effective against other RNA viruses, poliovirus, rhinovirus, and respiratory syncytial virus and evaluated and developed as a broad spectrum anti-RNA virus drug, including lethal RNA virus infections. According to national guidelines, Favipiravir treatment is applied to COVID-19 infection in Turkey. The main purpose of this study is to obtain efficacy and safety data for ribavirin and favipiravir in the Turkish patient cohort diagnosed with COVID-19. This study designed as an open-label, multicenter, parallel-group, randomized, phase II/III clinical drug trial. This study will be conducted in 4 sites.

Study Type : Interventional
Estimated Enrollment : 100 participants
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: An Open-Label, Multicenter, Parallel-Group, Randomized, Phase II/III Study to Evaluate the Efficacy and Safety of Favipiravir and Ribavirin Formulation for Treatment of COVID-19
Actual Study Start Date : April 2021
Estimated Primary Completion Date : September 30, 2021
Estimated Study Completion Date : December 31, 2021
Arm Intervention/treatment

Experimental: Ribavirin Arm

Ribavirin dosage: 200 mg oral ribavirin capsules for 5 days Regimen: 1200 mg loading dose on day-1 (three capsules in the morning and three capsules in the evening) followed by 800 mg/day maintenance dose (two capsules in the morning and two capsules in the evening) on day-2 to day-5.

Drug: Ribavirin Capsules

Active Comparator: Favipiravir Arm

Favipiravir dosage: 200 mg oral favipiravir tablets for 5 days Regimen: 2x1600 mg loading dose on day-1 (eight tablets in the morning and eight tablets in the evening) followed by 2x600 mg maintenance dose (three tablets in the morning and three tablets in the evening) on day-2 to day-5.

Drug: Favipiravir

Ages Eligible for Study: 18 Years
Sexes Eligible for Study: All
Accepts Healthy Volunteers: No
Inclusion Criteria
  • Female or male patients aged 18 years and older infected with the SARS-CoV-2 virus.
  • Patients that have COVID-19 symptoms within 72 hours and have a positive PCR test result.
  • Patients in a stable clinical condition and referred as outpatient for COVID-19 infection.
  • Patients who sign the informed consent before the any study procedures.
Exclusion Criteria
  • Patients who have required hospitalization.
  • Patients who have required intensive care.
  • Patients who do not sign the informed consent.
  • Any condition that in the investigator's judgement might interfere with study procedures or the ability of the patient to adhere to and complete the study.
  • Patients who have been participating in any other clinical trial.
  • Severe liver failure (Child Pugh score ≥ C, transaminase>5 times the upper limit of normal (ULN).
  • Severe renal failure (GFR ≤30 mL/min/1.73 m2) or continuous dialysis (hemodialysis, peritoneal dialysis) or continuous renal replacement therapy.
  • Severe cardiac disease.
  • History of hypersensitivity to either ribavirin/favipiravir.
  • Pregnant or breast-feeding.
  • Patients who cannot use appropriate contraceptive method during and after the study.
  • Patients who are treated with any other treatment agent for COVID-19 in the last 90 days.
  • Patients who had COVID-19 vaccination.
  • Patients who had ribavirin/favipiravir for any reason in the past 72 hours.

Efficacy and Safety of Favipiravir and Ribavirin Formulation for Treatment of COVID-19

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Efficacy and Safety of Favipiravir and Ribavirin Formulation for Treatment of COVID-19

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Want to participate in this study, select a site at your convenience, send yourself email to get contact details and prescreening steps.


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Turkey, Cebeci

Ankara University, School of Medicine

Ankara, Cebeci, Turkey, 06590

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Ankara, Turkey, 06800

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Koc University Hospital

Istanbul, Turkey, 34010

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Umraniye Training and Research Hospital

Istanbul, Turkey, 34764