Oseltamivir Capsules 75 mg Antiviral Composition Active ingredient: Oseltamivir phosphate. Capsules containing 98.5 mg oseltamivir phosphate equivalent to 75 mg of oseltamivir Oseltamivir is presented as hard capsule with Red cap and White body Properties and effects Mechanism of action Oseltamivir phosphate is a pro-drug of a potent and selective inhibitor of influenza virus neuraminidase