Not withstanding responses by others....YOUR posting is correct. Good on you.
Over many years, my GP and several hospital Drs/Surgeons and others have repeatedly reminded me that Grapefruit and its juice variously and seriously affects many drugs.
In many instances it GREATLY MAGNIFIES the drug's effect.
In many others it NEGATES the effect.
Both can cause extreme harm to the patient's health.
Bottom line....NEVER consume grapefruit whilst taking prescribed drugs, UNLESS your Dr has SPECIFICALLY told you THAT SPECIFIC COMBINATION is benign.
That way you may just LIVE LONGER.
"There are holes in the sky where the rain gets in.
The holes are small....so the rain is t h i n ". ( Spike Milligan