Active Ingredients

• The active ingredient that makes Tamiflu work is oseltamivir phosphate. It is a white crystalline solid composed of carbon, hydrogen, nitrogen and oxygen.
  
  

Inactive Ingredients

• Inactive ingredients in Tamiflu include croscarmellose sodium, povidone K 30, pregelatinized starch, sodium stearyl fumarate, and talc.
  
  

Coating

• The capsule itself varies in its ingredients depending on the size. The 30 mg, 45 mg, and 75 mg tablets each contain gelatin and titanium dioxide, while different combinations of yellow, red, and black iron oxide are used.
  
  

Labeling

• The labeling of each capsule is printed with a blue ink. This ink contains FD&C Blue No. 2, a coloring agent that is considered edible by the U.S. Food and Drug Administration (FDA).
  
  

Additional Ingredients

• To maintain the full consistency of the powder in the pill, a combination of different materials are used. These include suspension agents and flavorings such as monosodium citrate, saccharin sodium, sodium benzoate, sorbitol, titanium dioxide, and tutti-frutti flavorings.