8 months is just to be safe. i work in a pharmacy and the pharmacist said that liquid medications last about 8 months after they've been opened. if unopened, i would say 1-2 years. the expiration dates on liquids that we receive in the pharm on a daily basis expire in a year or 2 after we get them. research chems differ, because you have no idea when exactly they were made and most do not have exp. dates on them. i would stick with 8 months just to be safe. you don't want to take 40mg of nolva and have it REALLY only equal 10mg due to it losing potency, then grow boobs, lol.