MedlinePlus is a government website that shows CBD’s major medication interactions with Clobazam and Valproate along with other moderate/minor interactions. One study specifically looked at warfarin (a blood thinner), which may be a dangerous interaction as well. Drugs.com suggests a slightly larger list of 24 medication with major interactions, but check with your doctor and ask if you should avoid grapefruit juice while on your medications. If the answer is yes, then you should probably avoid CBD as well.