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Dose, of the confection, commonly called "lenitive electuary," from one to three or four drachma at bedtime; of the infusion, from one to two ounces; of the tincture, irom one to two drachms; of the syrup (used for children), from one drachm to one ounce. Caution.--Do not give senna, in any form except confection, in hemorrhoids, and never in irritability of the intestines. 739. Rhubarb Rhubarb is a purgative, astringent and stomachic. It is used externally in the form of powder to ulcers, to promote a healthy action. It is given internally in diarrhoea, dyspepsia, and a debilitated state of the bowels. Combined with a mild preparation of calomel, it forms an excellent purgative for children. Dose, of the infusion, from one to two ounces; of the powder, from one scruple to half a drachm as a purgative, and from six to ten grains as a stomachic; of the tincture and compound tincture, from one to four drachms; of the compound pill, from ten to twenty grains. 740. Jalap Jalap is a powerful cathartic and hydrogogue, and is therefore apt to gripe. Dose, of the powder, from ten to thirty grains, combined with a drop or two of aromatic oil; of the compound powder, from fifteen to forty grains; of the tincture, from one to three drachms; of the extract, from ten to twenty grains. The watery extract is better than the alcoholic. 741. Colocynth Colocynth is a powerful drastic cathartic, and should never be given alone, unless ordered by a medical man, as its action is too violent for some constitutions.