Study aim: Determining the effectiveness of "SALIRAVIRA" as a natural product containing of Licorice, Coneflower, Ginseng, Hyssop, Rhubarb and Rosemary extracts to coronavirus load in COVID-19 patients Design: Randomized blind controlled trial with two parallel groups Settings and conduct: Patients are recruited in the infectious diseases department of Imam Khomeini Hospital complex and a clinic; assigned in two parallel groups randomly.Participants and outcome evaluators are blind to the study Participants/Inclusion and exclusion criteria: Inclusion criteria: COVID-19 patient confirmed by positive PCR-viral load test, Having some or all of the symptoms include fever, fatigue, muscle aches ( body aches), headache, cough, chest tightness, and shortness of breath. Exclusion criteria: Malignant tumors and other acute systemic diseases and respiratory problems Life-threatening comorbidity, Use of any other herbal substance.Pregnancy, Lactation and drug and Alcohol addiction. Intervention groups: Intervention group: Patients who receive "SALIRAVIRA" along with standard treatments as add on therapy. Control group: Patients who receive only standard treatments. Main outcome variables: Viral clearance, Improving the symptoms of the disease such as fever and shortness of breath