Myrrh A, Myrrh. This agent is stimulant, expectorant, and emmenagogue, but is seldom employed except in combination with other agents. As an expectorant, its combination with squill is highly useful in chronic bronchitis. Senega and wild cherry cooperate well with it. In indigestion it is combined with gentian, capsicum, and other drugs, and in amenorrhea with iron and aloes. U.S.P. tincture, 5 to 30 I.