How long can the antibiotics be stored?

The FDA requires pharmacies to put an expiration date of 1 year on prescriptions. Most antibiotics will come with an expiration date between 2 and 3 years from the date of manufacture. To maximize the shelf-life of your medications they should be stored in air-tight containers in a cool, dry environment. 

Under proper storage conditions antibiotics, expiration dates can be extended for a minimum of an additional 5 years.

Studies have even shown 90% retained potency after as many as 20 years.