Screening participants will sign the appropriate informed consent form (ICF) prior to completion of any study procedures.~Patients will be randomized to one of three arms, all participants will receive standardized medical treatment (SMT) according to Scheme for Diagnosis and Treatment of 2019 Novel Coronavirus Pneumonia (The 9th Trial Edition) from health commission of China, including bed rest, adequate energy and nutrition, pay attention to water and electrolyte balance to maintain a stable internal environment, closely monitor and Chinese traditional medicine, etc.~low-dose experimental arm：cepharanthine 60mg/day + SMT~high-dose experimental arm：cepharanthine 120mg/day + SMT~placebo control arm：placebo + SMT~The primary outcome measure is the time to viral clearance which defined as first positive nucleic acid test to the date of the first negative test (in two consecutive point). SARS-CoV-2 viral load was detected and quantified by RT-PCR using nasopharyngeal swabs . Ct value>35 for both ORF1ab and N gene was considered as negativity.
The purpose of this study is to evaluate the efficacy and safety of high/low-dose cepharanthine for the Treatment of COVID-19 in asymptomatic and non-pneumonia mild adult participants with COVID-19 who do not need to be in the hospital, but in alternate care site.