The oseltamivir phosphate capsules segmentation by application is anchored in three primary uses: Influenza Treatment, Prophylaxis, and Pediatric Use. Influenza Treatment accounts for the largest share, reflecting the drug’s established role in reducing symptom duration and viral shedding in confirmed cases; this segment drives roughly two‑thirds of total market revenue due to high prescription volumes during seasonal outbreaks. Prophylaxis represents a secondary pillar, encompassing preventive dosing for individuals exposed to the virus or residing in high‑risk environments; its contribution is moderated by shorter treatment courses and stricter prescribing guidelines, yet it still commands a quarter of market value. The Pediatric Use segment, while numerically smaller, is critical for addressing age‑specific dosing requirements and regulatory approvals, contributing the remaining 10 % of market size. Together, these application categories delineate demand drivers, inform supply chain allocation, and shape pricing strategies across the global oseltamivir phosphate capsules market.