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Used externally, combined with oil, it forms a cheap and useful liniment, but it should be dissolved in proof spirit before the oil is added. One part of this salt, and three parts of extract of belladonna, mixed and spread upon leather, makes an excellent plaster for relieving rheumatic pains. As a local stimulant it is well known, as regards its effects in hysterics, faintness, and lassitude, when applied to the nose, as common smelling salts. It is used internally as an adjunct to infusion of gentian in dyspepsia or indigestion, and in moderate doses in gout. Dose, from five to fifteen grains. Caution.--Overdoses act as a narcotic and irritant poison.