Study aim: Comparison of the effect of acetylcysteine and bromhexine on the improvement and prevention of hospitalization in outpatients Design: One group of patients will be given oral acetylcysteine 600 mg twice daily for 5 days and another group will be given 8 mg bromhexine tablets three times daily and the control group will receive only the usual treatments prescribed to the other two groups. for 5 days. Referral, on day 7 and day 14, patients' oxygen levels and hospitalization and death are checked. Settings and conduct: This double-blind clinical trial is conducted on 225 outpatients at the Dibaj City Service Center. After the initial diagnosis of the covid-19 disease, according to the symptoms of the patients by the doctor, first of all, the pharynx and nose sample for RT-PCR test for The diagnosis of covid-19 is made in the health service center and after the positive test, the patient is included in the study. First, the blood oxygen level of the patients was measured with a pulse oximeter and patients were randomly divided into one of three groups. Patients are then asked to visit the clinic on the 7th and 14th days to check their oxygen levels. Participants/Inclusion and exclusion criteria: Inclusion criteria include: • Adult patients aged 18 to 80 years referred to Dibaj Municipal Service Center • Outpatients with Covid-19 symptoms after positive Covid-19 RT-PCR test • Oxygen level 98-92% Exclusion criteria: • Pregnancy and lactation .Patients taking nitroglycerin. Intervention groups: This clinical trial is performed on outpatients Covid 19. One group of patients is given oral acetylcysteine 600 mg twice daily for 5 days and another group is given 8 mg bromhexine tablets three times daily for 5 days, The control group will receive only the usual treatments prescribed to the other two groups. Main outcome variables: Duration of recovery, Duration of hospitalization, Death