Depending on source/storage, the shelf-life for Tamiflu is 18months 2years.
Do not use uncertain sources.
PLEASE go to your physician - talk over the symptoms - secure an advance prescription - and then if/when your fever soars to 102 with additional symptoms immediately purchase a fresh batch from your local pharmacy, consume the prescribed doseage, and return to your physician.
INFLUENZA - and its treatment is NOT to be taken lightly. It is not the common cold.
Tamiflu works (from my personal experience, three times, over six years) BUT...see a doctor, PLEASE!!!
Sincerely,
Gargoyle