Which herb commonly interacts with antihypertensives and anticoagulants?

• A. Theobroma cacao
• B. Vinca major
• C. Viscum album
• D. Vitex agnus-castus

Answer: (B)

Herbs can affect blood pressure and blood clotting, so combining them with antihypertensives or anticoagulants can lead to additive effects: more lowering of blood pressure or an increased tendency to bleed.

Vinca major contains alkaloids like vincamine that act as vasodilators, which can lower blood pressure and potentially enhance the effect of antihypertensive drugs. It also has influences on platelet function, which can augment the effects of anticoagulants and raise bleeding risk. Because of these dual actions on both blood pressure and coagulation, this herb is the one among the options most likely to interact with both antihypertensives and anticoagulants.

The other herbs don’t have the same well-established dual profile. Theobroma cacao is mainly noted for mild cardiovascular effects from stimulants rather than clinically significant interactions with anticoagulants. Viscum album (mistletoe) has its own clinical considerations, but its interactions aren’t as consistently linked to both antihypertensives and anticoagulants. Vitex agnus-castus influences hormonal pathways rather than blood pressure or coagulation in a typical manner.