Grapefruit juice and Meds

Hi All!  I'm just wondering if Crytal Light Sunrise Ruby Red Grapefruit is also considered a no-no when you are taking medication (I'm on thyroid med).  I'm assuming the Crystal light isn't true grapefruit juice but wasn't sure.   Thanks!!

Ok, I found out from the pharmacist that grapefruit juice doesn't affect my thyroid medicine or claritin-d anyhow so I should be fine!