I don't have the exact info you are looking for. Being that they are both a citrate I would think they would expire sooner than other drugs. However the experation date is just a date that is used to be sure they still have there full potency (or very close to full potency). Even if they expired a little while back they will still have the active ingredient in them, just might not be as potent as it once was... A hypothecal example would be a 50mg clomid tab 1 year after experation date might only contain 40mg. of clomiphene citrate (That was just an example to show you what I was saying, no hard data to support those numbers).