The difference between Four Seasons Antiviral Combination and Oseltamivir lies in the indications, side effects after taking it and so on. 1. Different indications: Four Seasons Antiviral Combination has the effect of clearing heat and reducing inflammation, and can be used to treat upper respiratory tract infections, viral colds and common colds. Oseltamivir is a common antiviral drug, mainly used for the treatment and prevention of targeted A and B influenza. 2. Side effects are different: Four Seasons Antiviral Combination is a proprietary Chinese medicine, the side effects are not yet clear. The most common side effects of Oseltamivir are gastrointestinal reactions and mental aspects. Common gastrointestinal reactions include nausea, vomiting, diarrhea, etc. Mental hallucinations and behavioral abnormalities may also occur. Therefore, before taking the drug, you need to go to the hospital for examination and take the drug as prescribed by the doctor to avoid any discomfort.