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All Studies   Meta Analysis    Recent:   
0 0.5 1 1.5 2+ Hospitalization 89% Improvement Relative Risk ER visit 30% Recovery -19% Viral shedding -32% primary Favipiravir  Holubar et al.  EARLY TREATMENT  DB RCT Is early treatment with favipiravir beneficial for COVID-19? Double-blind RCT 149 patients in the USA (July 2020 - March 2021) Lower hospitalization (p=0.058) and progression (p=0.56), not sig. Holubar et al., Clinical Infectious Di.., Nov 2021 Favors favipiravir Favors control

Favipiravir for treatment of outpatients with asymptomatic or uncomplicated COVID-19: a double-blind randomized, placebo-controlled, phase 2 trial

Holubar et al., Clinical Infectious Diseases, doi:10.1093/cid/ciac312 (date from preprint)
Nov 2021  
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Small RCT 116 mITT patients in the USA, 59 treated with favipiravir, showing no significant differences with treatment.
risk of hospitalization, 89.0% lower, RR 0.11, p = 0.06, treatment 0 of 75 (0.0%), control 4 of 74 (5.4%), NNT 18, relative risk is not 0 because of continuity correction due to zero events (with reciprocal of the contrasting arm).
risk of ER visit, 29.5% lower, RR 0.70, p = 0.56, treatment 5 of 75 (6.7%), control 7 of 74 (9.5%), NNT 36.
risk of no recovery, 19.0% higher, RR 1.19, p = 0.43, treatment 65, control 70, inverted to make RR<1 favor treatment, initial resolution of symptoms.
viral shedding, 31.6% higher, RR 1.32, p = 0.24, treatment 59, control 57, inverted to make RR<1 favor treatment, primary outcome.
Effect extraction follows pre-specified rules prioritizing more serious outcomes. Submit updates
Holubar et al., 24 Nov 2021, Double Blind Randomized Controlled Trial, USA, peer-reviewed, 26 authors, study period 8 July, 2020 - 23 March, 2021, average treatment delay 5.0 days, conflicts of interest: Pfizer, Gates Foundation, Gilead, Regeneron, Janssen.
This PaperFavipiravirAll
Favipiravir for treatment of outpatients with asymptomatic or uncomplicated COVID-19: a double-blind randomized, placebo-controlled, phase 2 trial
MD MS Marisa Holubar, MD Aruna Subramanian, PhD Natasha Purington, PhD Haley Hedlin, MS Bryan Bunning, PhD Katharine S Walter, MD Hector Bonilla, Athanasia Boumis, MD Michael Chen, Kimberly Clinton, Liisa Dewhurst, MD Carol Epstein, MD Prasanna Jagannathan, MD Richard H Kaszynski, Lori Panu, MD Julie Parsonnet, PhD Elizabeth L Ponder, MD Orlando Quintero, PhD Elizabeth Sefton, MD Upinder Singh, Luke Soberanis, PharmD Henry Truong, MD Jason R Andrews, PhD Manisha Desai, PhD Chaitan Khosla, MD Yvonne Maldonado
Background: Favipiravir is an oral, RNA-dependent RNA polymerase inhibitor with in vitro activity against SARS-CoV2. Despite limited data, favipiravir is administered to patients with COVID-19 in several countries. Methods: We conducted a phase 2 double-blind randomized controlled outpatient trial of favipiravir in asymptomatic or mildly symptomatic adults with a positive SARS-CoV2 RT-PCR within 72 hours of enrollment. Participants were randomized 1:1 to receive placebo or favipiravir (1800 mg BID Day 1, 800mg BID Days 2-10). The primary outcome was SARS-CoV-2 shedding cessation in a modified intention-to-treat (mITT) cohort of participants with positive enrollment RT-PCRs. Using SARS-CoV-2 amplicon-based sequencing, we assessed favipiravir's impact on mutagenesis. Results: From July 8, 2020 -March 23, 2021, we randomized 149 participants with 116 included in the mITT cohort. The participants' mean age was 43 years (SD 12.5) and 57 (49%) were women. We found no difference in time to shedding cessation by treatment arm overall (HR 0.76 favoring placebo, 95% confidence interval [CI] 0.48 -1.20) or in sub-group analyses (age, sex, high-risk comorbidities, seropositivity or symptom duration at enrollment). We observed no difference in time to symptom resolution (initial: HR 0.84, 95% CI 0.54 -1.29; sustained: HR 0.87, 95% CI 0.52 -1.45). We detected no difference in accumulation of transition mutations in the viral genome during treatment. Conclusions: Our data do not support favipiravir use at commonly used doses in outpatients with uncomplicated COVID-19. Further research is needed to ascertain if higher doses of favipiravir are effective and safe for patients with COVID-19.
Participants We enrolled asymptomatic or symptomatic adults without respiratory distress who had a positive SARS-CoV-2 reverse-transcription polymerase chain reaction assay (RT-PCR) collected within 72 hours of enrollment. We excluded individuals who required renal replacement therapy, had liver impairment, were immunocompromised, or were pregnant or breast-feeding. See Supplementary Appendix for full criteria. Participants were randomized 1:1 to favipiravir or placebo using block, REDCap-implemented, randomization stratified by age (>=50 and <50 years old) and sex. [4, 5] Procedures Participants received placebo or favipiravir 1800 mg BID on day 1, then 800mg BID on days 2-10. Favipiravir and placebo tablets were identical in appearance to maintain blinding. We followed participants for 28 days and performed a clinical assessment (including vital signs and targeted physical exams) and collected oropharyngeal (OP) swabs and blood samples at each visit. Staff-collected OP specimens underwent RT-PCR (Viroclinics Biosciences, Rotterdam, The Netherlands). Anti-SARSCoV-2 serology was performed using a virus plaque reduction neutralization assay (Viroclinics Biosciences, Rotterdam, The Netherlands). Participants self-collected daily anterior nasal swabs on days 1-10, 14, 21, and 28 and submitted them directly for RT-PCR with an assay that targeted the viral nucleocapsid gene's N1 and N3 regions (Quest Diagnostics, Secaucus, New Jersey). Participants also completed..
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Andrews, The author reports research support from anonymous donors to Stanford University
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Lou, Liu, Yao, Clinical Outcomes and Plasma Concentrations of Baloxavir Marboxil and Favipiravir in COVID-19 Patients: An Exploratory Randomized, Controlled Trial, Eur J Pharm Sci
Maldonado, The author reports grants from the NIH (U54, Pfizer
Shannon, Selisko, Le, Rapid incorporation of Favipiravir by the fast and permissive viral RNA polymerase complex results in SARS-CoV-2 lethal mutagenesis, Nat Commun
Sissoko, Laouenan, Folkesson, Experimental Treatment with Favipiravir for Ebola Virus Disease (the JIKI Trial): A Historically Controlled, Single-Arm Proof-of-Concept Trial in Guinea, PLoS Med
Tomita, Takeda, Matsuyama, The anti-influenza virus drug favipiravir has little effect on replication of SARS-CoV-2 in cultured cells, Antimicrob Agents Chemother
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Wang, Zhong, Salam, Phase 2a, open-label, dose-escalating, multi-center pharmacokinetic study of favipiravir (T-705) in combination with oseltamivir in patients with severe influenza, EBioMedicine
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