How many capsules of Roxithromycin should be taken at one time depends on the severity of the condition and the specifications of the medicine, and must be taken as prescribed by the doctor. Roxithromycin capsule is a common macrolide antibiotic, applicable to pharyngitis and tonsillitis caused by purulent streptococcus; pneumonia caused by Mycoplasma pneumoniae or Chlamydia pneumoniae; otitis media, sinusitis, acute bronchitis, acute exacerbation of chronic bronchitis caused by sensitive organisms, skin and soft tissue infections; chlamydia trachomatis causes cervicitis and urethritis, and so on. Adults take Roxithromycin capsules, 2 capsules (150mg) once a day, twice a day; or 4 capsules (300mg) once a day, once a day. Children take Roxithromycin Capsules, 2.5-5mg/kg of body weight once, twice a day; adverse reactions include abdominal pain and diarrhea, nausea and vomiting, rash, itchy skin, dizziness and headache, liver function abnormalities, and decreased peripheral blood cells. This product can not be paired with ergotamine, dihydroergotamine, terfenadine, bromocriptine, ketoconazole and cisapride, and erythromycin there is also cross-resistance; allergic to the drug and erythromycin or other macrolides is prohibited; hepatic insufficiency, pregnant women and lactating women with caution. Patients must be under the guidance of a physician to strictly follow the instructions of the doctor to take medication, do not self-medication.