I just used some Visine. Right after using it I thought, "I've had this for a really long time," so I checked the expiration date. June 2001. It deeply troubles me that they bothered adding a month to the expiration date. The month designation indicates to me that it goes bad quickly--it's okay for your eyes one month, Drano six weeks later. Now imagine what happens if you use it six years after it's expired. It probably makes you deaf. Still, I think I'll hold onto it.