A sympathetic nerve stimulant resembling adrenaline, its effect on the unstriped muscular fibres is remarkable. It acts promptly in relieving swellings of the mucous membrane. It has valuable antispasmodic properties, acts on the air passages and is of benefit in asthma and hay fever; it is also employed for rheumatism; a 5 to 10 per cent solution has mydriatic properties, prophylactically used for low blood pressure in influenza, pneumonia, etc. Used in tablet form for oral or hypodermic administration and in ampuls for hypodermic, intramuscular and intravenous use. It can advantageously be used in solution with liquid paraffin, either alone or in conjunction with methol camphor and oil of thyme. Dose, 1/2 to 1 grain. Synonyms include Ephedra, and Ma Huang.