It is critical to consult a physician before mixing herbal remedies with prescription medication for treating blood pressure conditions, as there are at least 19 different herbs that are contraindicated, according to the Institute for Traditional Medicine. There are many other herbs that are effective and safe for cardiovascular support.
Some of the herbs that are contraindicated are common household herbs such as parsley, capsicum, licorice, ginger, ginseng and St. John's wort. Others, such as vervain, gentian, chaste berry, blue cohosh and coltsfoot are more likely to be found in an herbal medicine cabinet than in the kitchen. Both ephedra and guarana are also on the list of contraindicated herbs, so being aware of caffeine and caffeine substitutes is important.