A patient has been exposed to influenza A virus and is in his sixth day of symptoms. He has heard that an antiinfluenza drug is available and requests therapy. You tell him that therapy is not...

A patient has been exposed to influenza A virus and is in his sixth day of symptoms. He has heard that an antiinfluenza drug is available and requests therapy. You tell him that therapy is not appropriate. To what therapeutic agents is the patient referring, and why did you decline to use the treatment?