No.
Grapefruit (also known as grapefruit) is certainly a “dangerous fruit” for thyroid cancer patients who are taking medication. This is because grapefruit contains an active substance called furanocoumarin, which inhibits the activity of CYP3A4 metabolizing enzymes in the liver, thus affecting the metabolism of many medications in the body, including levothyroxine sodium tablets, and causing a doubling of the amount of medication entering the bloodstream.
One cup (about 200 mL) of grapefruit juice or one grapefruit can inhibit drug metabolism for hours or even days. The more you eat, the more pronounced this inhibition becomes and the longer it lasts. It is worth noting that the effects of grapefruit cannot be completely avoided even by staggering the time of eating grapefruit and taking the drug. Therefore, it is recommended that thyroid cancer patients should not eat grapefruit and related foods containing active ingredients of grapefruit (including: Sha Tin grapefruit, red heart grapefruit, etc.) while taking medication. In case you eat grapefruit even after taking the medication, it is recommended to consult your doctor if you need to adjust your medication.