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For five thousand years, Chinese medicine relied on derivatives from plants of the genus Ephedra to treat asthma and hay fever. Ephedra acts as a decongestant, aids in the proper elimination of fluids, and relieves bronchial spasms; these properties make it valuable to sufferers of allergies, asthma, colds, and other respiratory complaints. Western medicine has used Ephedra as a bronchodilator and nasal decongestant, as well as to control urinary incontinence, since the 1920s.