If you really need to be on Clopidogrel and you want to be sure you are getting the proper dose you may need to give up grapefruit altogether or alternatively ask you physician if you need an anti platelet drug at all and if so is there an alternative you could use.I really love grapefruit and grapefruit juice, but if I needed to take any medications on a regular basis, I would give it up. There are just too many metabolism problems with it.