There are plenty of medications I've seen where they specifically call out interactions with grapefruit. And pharmacists will warn you about that, if this is th

There are plenty of medications I've seen where they specifically call out interactions with grapefruit. And pharmacists will warn you about that, if this is the first time you're taking these meds. Pharmacists will generally warn you about known major drug interactions, when you should take the medication, etc... when you're getting a new medication that you've not had before. Now, if you've had this medication before, they may not warn you. But they will ask if this is the first time you're taking this medication. At least, that's always been my experience.