| http://www.w3.org/ns/prov#value | - Achillea may interact with blood thinners such as warfarin (Coumadin) and aspirin, as well as lithium and sedative medications.Hibiscus (Hibiscus sabdariffa) tea, 2 tablespoonfuls of dried herb steeped in 1 cup of water, taken one time per day, helped lower blood pressure according to one study.
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