Blood Root - Sanguinaria canadensis In small doses, it is a stimulant and expectorant for a dry irritating non-productive cough, helping clear the bronchials or mucus. In large doses, it is a depressant, causing headache and nausea. In poisonous doses, it can cause respiratory failure. USE CAUTIOUSLY. Dancing Willow Herbs only dispenses Blood Root to those working with a health care professional. Contains anti-fungal properties with external use. *This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. IMPORTANT: This herb is only dispensed with a prescription from a practitioner.