1. Different business scope: Tamiflu's business scope is mainly concentrated in the field of drug treatment, which is used to treat influenza. Pfizer is a global biopharmaceutical company, involving many fields, including tumor, vaccine, anti-infection, inflammation and immunity, rare diseases and so on.
2. Different uses: Tamiflu is a drug, mainly used to treat influenza A and B. Pfizer is a biopharmaceutical company dedicated to the research and development and production of innovative drugs.