Butterfly milkweed is one of my favorite roadside wildflowers. It has another common name pleurisy root, earned from its traditional use for conditions of the lungs. Pleurisy refers to an inflammation of the lining around the lungs, as sometimes results from coughs and other disorders. Pleurisy root was traditionally used to ease this painful condition, partially because it can help reduce pain and inflammation in the lungs. Pleurisy root is also used for wet coughs that are due to upper respiratory tract infections. Pleurisy root is a stimulating expectorant, which means it helps to encourage a productive cough so mucus is more efficiently expelled from the lungs.
Pleurisy root also supports the body during infections in less direct ways. Pleurisy root is used to induce sweating during a fever. This can help break an uncomfortable fever, but for this effect it is best to take it with a hot beverage like tea. It can also be used to support suboptimal fevers, where the temperature isn’t high enough for the full immune benefit of a fever. Pleurisy root also stimulates the circulation of the lymphatic system, particularly around the lungs. This action can also contribute to a more effective immune response. For all of these pulmonary benefits, pleurisy root has earned a place in many herbal blends used for coughs and bronchitis. It is usually used in fairly low to medium doses because higher doses can cause nausea and vomiting.