The leaves and flowers of Rhododendron mainly treat urticaria and bronchitis, and can relieve swelling and pain for external use. Can be used for treating traumatic injury, rheumatoid arthritis, expectoration, metrorrhagia, and amenorrhea (prohibited for pregnant women).
There is a yellow rhododendron, also known as "Buxus macrophylla" and "Ranunculus japonicus". Its roots, flowers and leaves are poisonous and have the effects of expelling wind and removing dampness, anesthesia and pain, promoting blood circulation and removing blood stasis. It is a narcotic painkiller and has certain toxicity.