Have you had Viagra pills sitting in your medicine cabinet for many years? If so, you need to check the expiry date on the package. As with most medication, Viagra pills do expire. Normally the drug will remain effective for one year after being prescribed. However, you need to check your package for the exact date. It is not recommended to take Viagra after the expiration period. The potency of the medication will slowly decrease after it has expired. Taking expired medication can also be dangerous because it is not possible to know all of the possible side effects and how they will affect you personally. If you’re not sure if Viagra will work for you, it is better to obtain a small initial prescription from your doctor. You can always place a larger order if you find the pills work.