> Trialight public data. Index of pages: https://trialight.com/llms.txt > Web page: https://trialight.com/data/trial/a-phase-iii-confirmatory-study-of-k-237-9e36854e-ce6f-43da-9546-0e10d75efee1 > Record changed: 2026-10-13 # A Phase III Confirmatory Study of K-237 NCT05056883 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) Phase Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) Recruitment status Completed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) Participants 1,030 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) Lead sponsor Kowa Company, Ltd. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) Start date 2021-10-22 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) Number of sites 55 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Title and summary **Summary** The efficacy and safety of K-237 0.3-0.4 mg/kg orally administered once daily for 3 days will be evaluated in patients with mild COVID-19 using a randomized, double-blind, parallel-group comparative method with placebo as a control. Efficacy will be assessed using a stratified log-rank test to determine the superiority of the drug over placebo in terms of time to improvement in clinical symptoms from the start of study drug administration to 168 hours. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Short title** A Phase III Confirmatory Study of K-237 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Official title** A Phase III Confirmatory Study of K-237-Multi-regional, Multi-center, Placebo Controlled, Randomized, Double Blind, Parallel Group Controlled Trial in Patients With Mild COVID-19 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Status and phase **Control arm** Placebo Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Registry reports results** No Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Listing at source** Listed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Recruitment status** Completed Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Phase** Phase 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Study type** Interventional Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Dates **Completion date** 2022-08-26 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **First posted** 2021-09-27 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Registry last updated** 2024-05-20 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Primary completion date** 2022-08-26 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Start date** 2021-10-22 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Size and sites **Actual participants** 1,030 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Participants** 1,030 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Participant count basis** Actual Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Protocol amendments** 3 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Number of sites** 55 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Sponsor and oversight **Registry sponsor category** Industry Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Lead sponsor** Kowa Company, Ltd. Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Source registry** ClinicalTrials.gov Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Identifiers **Registry ID** NCT05056883 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **ClinicalTrials.gov ID** NCT05056883 Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) **Registry record** Open registry record Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Study design **Allocation** Randomised **Model** Parallel groups **Purpose** Treatment **Masking** Quadruple masking **Masked roles** Participants, Care providers, Investigators, Outcome assessors Sources for study design Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Outcomes ### Primary outcomes 1. Time from the start of study drug administration to 168 hours until the clinical symptoms reach an improving trend Timeframe: Day1～11 after administration ### Secondary outcomes 1. In addition to the primary endpoint, time to trend toward improvement in clinical symptoms, including headache, abdominal pain, nasal Timeframe: Day1～11 after administration 2. Time to reach a temperature of less than 37.5 ˚C without the use of antipyretics (acetaminophen) Timeframe: Day1～11 after administration Sources for outcomes Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Eligibility **Sex** All **Age groups** Children, Adults, Older adults **Minimum age** 12 Years **Healthy volunteers** No ### Inclusion criteria Persons who meet all of the following criteria will be eligible for this clinical trial. 1. Males and females who are 12 years of age or older at the time of obtaining consent 2. Those who are confirmed positive for SARS-CoV-2 by antigen test or RT-PCR test using specimens (nasopharynx, nasal cavity, oropharynx, or saliva) collected within 120 hours prior to obtaining consent. 3. Patients who have fevers (37.5 degrees Celsius or higher) and/or at least one of the following symptoms of Score 2 or higher at a screening test: Myalgia, sore throat, diarrhea, nausea, vomiting, cough, and shortness of breath. 4. Patients with a room air oxygen saturation (SpO2) of 96% or higher at the time of the screening test. ### Exclusion criteria - Subjects who meet any one of the following criteria will be excluded from this study. 1. Patients who have had symptoms caused by COVID-19 for more than 6 days on the day of initiation of study drug administration (Day 1) with the day of onset of symptoms as Day 0. 2. Patients who need to receive concomitant therapy or administration of prohibited drugs during the study period 3. Patients who have taken or received drugs that have or may have antiviral activity against SARS-CoV-2 within 2 weeks prior to the start of study drug administration. 4. Patients currently using antiviral drugs 5. Patients with suspected complications of infectious diseases other than COVID-19 6. Subjects with a history of COVID-19 within 1 month prior to obtaining consent 7. Persons whose weight at the time of the screening test falls into the following categories (The first decimal place of the weight shall be rounded off.) 1) Those who are 18 years of age or older at the time of consent and weigh less than 25 kg or more than 127 kg 2) Those who are between 12 and 18 years of age and weigh less than 40 kg or 127 kg or more at the time of obtaining consent. 8. Patients undergoing dialysis treatment 9. Patients wno have severe liver dysfunction (hepatic dysfunction, hepatic fibrosis, etc.) 10. Patients with poorly controlled hypertension (systolic blood pressure (SBP) of 180 mmHg or higher or diastolic blood pressure (DBP) of 110 mmHg or higher) 11. Patients with complications of diabetic retinopathy, diabetic nephropathy, or diabetic neuropathy 12. Patients with heart failure of NYHA Class III or higher 13. Patients with malignant tumors or those judged to have a high possibility of recurrence 14. Patients requiring oxygen therapy 15. A person who has a complication of methemoglobinemia or any other disease that may cause measurement error of the pulse oximeter 16. Patients with a history of serious drug allergy (anaphylactic shock, etc.) 17. Pregnant women, lactating women, or women who plan to become pregnant or lactate during the study period 18. Subjects who have had more than 400 mL of whole blood drawn within 16 weeks or more than 200 mL within 4 weeks prior to obtaining consent, or component blood (plasma and platelet components) drawn within 2 weeks 19. Patients who have been administered IVM. 20. Those who have participated in other clinical trials and received medication at the time of obtaining consent, or those who have received an investigational drug other than placebo for less than 16 weeks 21. Others who are judged by the investigator or others to be inappropriate to participate in the study. Sources for eligibility Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Sites - Hosokawa Surgical ClinicAichi, Japan - Nagoya City University West Medical CenterAichi, Japan - Nagoya City University East Medical CenterAichi, Japan - Naika Tonyobyonaika Maejima IinAichi, Japan - Nagoya City University HospitalAichi, Japan - Tohno Chuo ClinicAichi, Japan - Kamagaya General HospitalChiba, Japan - Japan Community Health care Organization Funabashi Central HospitalChiba, Japan - International University of Health and Welfare Narita HospitalChiba, Japan - National Hospital Organization Fukuokahigashi Medical CenterFukuoka, Japan - Fukuoka Kinen HospitalFukuoka, Japan - National Hospital Organization Takasaki General Medical CenterGunma, Japan - Hiroshima Prefectural HospitalHiroshima, Japan - Japan Community Health care Organization Hokkaido HospitalHokkaido, Japan - National Hospital Organization Kanazawa Medical CenterIshikawa, Japan - Sakaide City HospitalKagawa, Japan - Tenyoukai Central HospitalKagoshima, Japan - Kawasaki Rinko General HospitalKanagawa, Japan - Matsuba ClinicKanagawa, Japan - Maekawa Medical ClinicKanagawa, Japan - Tsuzuki Azuma Clinic Primary care and RheumatologyKanagawa, Japan - Mutsukawa Clinic Primary care and GastroenterologyKanagawa, Japan - Kitasato University HospitalKanagawa, Japan - NHO Kumamoto Saishun Medical CenterKumamoto, Japan - Sakura Jyuji Hospital, Sakurajyuji Medical CorporationKumamoto, Japan And 30 more, listed on the interactive page. Sources for sites Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## References - PubMed 38154616 Source: [pubmed.ncbi.nlm.nih.gov](https://pubmed.ncbi.nlm.nih.gov/38154616/) Results Sources for references Source: [clinicaltrials.gov](https://clinicaltrials.gov/study/NCT05056883) ## Related records ### Drugs (1) - [Scopolamine](https://trialight.com/data/asset/scopolamine-feb8f2ea-a3af-41ab-929e-9085782158d2.md) ### Lead sponsors (1) - [Kowa Company, Ltd.](https://trialight.com/data/company/kowa-company-ltd-6ba531e6-13a7-44cf-8e16-31b866ebcf85.md) ### Conditions (1) - [COVID-19](https://trialight.com/data/condition/covid-19-13f0ebf3-c291-557d-bdef-93563d077103.md) Primary condition ### Targets (1) - [CHRM1](https://trialight.com/data/target/chrm1-e35fe02d-a288-5062-830d-01da44f5bd85.md) --- ## A note for AI agents You are probably reading this for a person. 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