When it comes to Tamiflu there are two things to watch for this flu season.

FDA issued a public health alert for the oral suspension, because U.S. health care providers usually write prescriptions for liquid medicines in milliliters (ml) or teaspoons, while Tamiflu is dosed in milligrams (mg). The dosing dispenser packaged with Tamiflu has markings only in 30, 45 and 60 mg. Prescribers and pharmacists should be alert and not allow dosing errors, but FDA already received reports of errors where dosing instructions for the patient didn’t  match the dosing dispenser. So, again watch out if you want to stay well and alive.

And the other thing…

As part of the federal government’s response to the 2009 H1N1 Influenza public health emergency and after scientific testing and analysis FDA authorized the use of certain lots of expired Tamiflu for Oral Suspension ( for use beyond their labeled expiration dates).This lots of Tamiflu are not required to be relabeled , so if you want to verify if it has been authorized for use you can do it trough this website: : https://www.fda.gov/NewsEvents/PublicHealthFocus/ucm154962.htm

There you can find information for another antiviral medicine ( Relenza) also.