Obs. Unless the tincture employed as the solvent be of the full strength, some of the disulphate remains undissolved. It is an excellent medicine when faithfully prepared.—Dose, 1⁄2 to 2 fl. dr.; in debility, dyspepsia, &c.
Tincture of Red Gum. Syn. Tinctura gummi rubri. (Mr Squire.) Prep. Red gum, 1 part; rectified spirit, 4. Digest and strain.—Dose, 20 to 40 minims.
Tincture of Red Lav′ender. Compound tincture of lavender.
Tincture of Rhat′any. Syn. Tinctura krameriæ (B. P., Ph. D.), L. Prep. 1. (B. P.) Rhatany, bruised, 1; proof spirit, 8; macerate 48 hours in 6 of the spirit, agitating occasionally, pack in a percolator; when it ceases to drop, pour on the remaining spirit, and wash the marc with spirit to make up 8.—Dose, 1 to 2 dr.
2. (Ph. D.) Rhatany root, in coarse powder, 8 oz.; proof spirit, 1 quart; macerate for 14 days, then press, and filter. Astringent.—Dose, 1 to 2 fl. dr. The formula of the Ph. U. S. is similar.
Tincture of Rhododendron. Syn. Tinctura rhododendri. (Niemann.) Prep. Leaves of Rhododendron Chrysanthum, 2 oz.; French brandy, 1⁄2 lb.; sherry, 1⁄2 lb. Digest for 15 days.
Tincture of Rhu′barb. Syn. Tinctura rhei (B. P., Ph. E.), L. Prep. 1. (B. P.) Rhubarb, bruised, 2; cardamom seeds, bruised, 1⁄4; coriander, bruised, 1⁄4; saffron, 1⁄4; proof spirit, 20; macerate for 48 hours with 15 of the spirit, agitating occasionally, pack in a percolator, and when it ceases to drop pour on the remaining spirit, press and wash the marc, and add spirit to make up 20.—Dose. As a stomachic, 1 to 2 dr.; as a purgative, 1⁄2 to 1 oz.
2. (Ph. E.) Powdered rhubarb, 31⁄2 oz.; cardamom seeds, bruised, 1⁄2 oz.; proof spirit, 1 quart; digest, or proceed by the method of displacement.
3. (Ph. L. 1824.) Rhubarb, 2 oz.; cardamoms, 4 dr.; saffron, 2 dr.; proof spirit, 32 fl. oz. Both the above are cordial, stomachic, and laxative.—Dose, 1 fl. dr, to 1 fl. oz.
Tincture of Rhubarb (Aqueous). Syn. Tinctura rhei aquosa. (Ph. G.) Prep. Rhubarb, 10 oz.; borax, 1 oz.; carbonate of potash, 1 oz.; boiling water, 85 oz. Infuse for 1⁄4 hour, then add rectified spirit, 10 oz. (by weight); let stand 21⁄2 hours, and add cinnamon water, 15 oz.