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Interaction: vitamin K antagonists and goji berries
In its latest issue of the drug safety bulletin, the Federal Institute for Drugs and Medical Devices (BfArM) draws attention to possible interactions between vitamin K antagonists and goji berries. Vitamin K antagonists such as phenprocoumon (e.g. Marcumar®) and warfarin (e.g. Coumadin®) are widespread. They are used to inhibit blood clotting.
Attitudes to these drugs or active ingredients must be individual for each patient and are fundamentally made difficult by numerous possible interactions with other drugs as well as with food and food supplements, as the BfArM notes. Treatment therefore requires regular monitoring of the tendency of the blood to clot.
Interaction with goji berries Further interactions have been reported in connection with the intake of goji berries. Patients who took vitamin K antagonists experienced increased INR and bleeding after consuming goji berries. Therefore, the BfArM advises patients who take vitamin K antagonists to avoid goji berries. The berries are used in Chinese cuisine as well as in traditional Chinese medicine. (pm)
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