Archives Herbal Dangers Part 3 of 4 Herbs for Various Symptoms Ma huang contains a potent pharmaceutical, ephedrine, in unpredictable concentrations.
Ephedrine is a stimulant used to treat asthma and nasal congestion.
It is also used in weight-loss preparations. Avoid this herb if you are taking blood pressure medicines or have a weak heart. It is also dangerous for diabetics since it will upset blood sugar control. Ma huang combined with digoxin can cause serious heart rhythm disturbances. Feverfew is alleged to prevent migraines, but also serves as an anticlotting agent and may precipitate heavy bleeding if taken before surgery, like aspirin and other anticoagulants.