Reports suggest that the shelf life of Viagra is estimated to 2 years from the date of manufacturing. Check the packing date before buying Viagra online. Viagra (sildenafil) generally has a shelf life of about 2 years from its manufacturing date, but always check the expiration date on your prescription bottle; use it before this date, as expired pills can lose potency and potentially become unsafe, and store them at room temperature, away from light and humidity, for maximum effectiveness. Don't use expired Viagra, as it may not work well and could have altered side effects, so it's best to get a new prescription and dispose of old tablets properly