@momandkim welcome to Mayo Clinic Connect. Who is “they” that says you should not drink cranberry juice while on warfarin? I would think that if the doctor that recommended the cranberry juice is the same one who prescribes the warfarin there shouldn’t be a problem. I think people can encounter problems when they shop around for doctors, treatments & medications and information. It is good to have a provider that knows the full medical history of the patient and can give the best advice for each individual.