Rabies Immune Globulin: Transparent or slightly opalescent liquid, practically colorless and practically odorless. May develop a slight, granular deposit during storage.
Rabies Vaccine: White to straw-colored, amorphous pellet, which may or may not become fragmented when shaken.
Racepinephrine: White to nearly white, crystalline, odorless powder, gradually darkening on exposure to light and air. With acids, it forms salts that are readily soluble in water, and the base may be recovered by the addition of ammonium hydroxide. Very slightly soluble in water and in alcohol; insoluble in ether, in chloroform, and in fixed and volatile oils.
Racepinephrine Hydrochloride: Fine, white, odorless powder. Darkens on exposure to light and air. Its solutions are acid to litmus. Melts at about 157. Freely soluble in water; sparingly soluble in alcohol.
Raloxifene Hydrochloride: Almost white to pale yellow powder. Freely soluble in dimethylsulfoxide; sparingly soluble in methanol; slightly soluble in alcohol; very slightly soluble in water, in isopropyl alcohol, and in octanol; practically insoluble in ether and in ethyl acetate.
Ramipril: White to almost white crystalline powder. Freely soluble in methanol; sparingly soluble in water.
Ranitidine Hydrochloride: White to pale yellow, crystalline, practically odorless powder. Is sensitive to light and moisture. Melts at about 140, with decomposition. Very soluble in water; sparingly soluble in alcohol.
Fully Hydrogenated Rapeseed Oil: White, waxy solid. Insoluble in water and in alcohol. NF category: Coating agent; stiffening agent.
Superglycerinated Fully Hydrogenated Rapeseed Oil: White solid. Insoluble in water and in alcohol. NF category: Coating agent; emulsifying and/or solubilizing agent; stiffening agent.
Purified Rayon: White, lustrous or dull, fine, soft, filamentous fibers, appearing under the microscope as round, oval, or slightly flattened translucent rods, straight or crimped, striate and with serrate cross-sectional edges. Is practically odorless and practically tasteless. Very soluble in ammoniated cupric oxide TS and in dilute sulfuric acid (3 in 5); insoluble in ordinary solvents.
Repaglinide: White to off-white solid. Melts at about 132 to 136. Soluble in methanol.
Reserpine: White or pale buff to slightly yellowish, odorless, crystalline powder. Darkens slowly on exposure to light, but more rapidly when in solution. Insoluble in water; freely soluble in acetic acid and in chloroform; slightly soluble in benzene; very slightly soluble in alcohol and in ether.
Resorcinol: White, or practically white, needle-shaped crystals or powder. Has a faint, characteristic odor and a sweetish, followed by a bitter, taste. Acquires a pink tint on exposure to light and air. Its solution (1 in 20) is neutral or acid to litmus. Freely soluble in water, in alcohol, in glycerin, and in ether; slightly soluble in chloroform.
Ribavirin: White, crystalline powder. Freely soluble in water; slightly soluble in dehydrated alcohol.
Riboflavin: Yellow to orange-yellow, crystalline powder having a slight odor. Melts at about 280. Its saturated solution is neutral to litmus. When dry, it is not appreciably affected by diffused light, but when in solution, light induces quite rapid deterioration, especially in the presence of alkalies. Very slightly soluble in water, in alcohol, and in isotonic sodium chloride solution; soluble in dilute solutions of alkalies; insoluble in ether and in chloroform.
Riboflavin 5¢-Phosphate Sodium: Fine, orange-yellow, crystalline powder, having a slight odor. Sparingly soluble in water. When dry, it is not affected by diffused light, but when in solution, light induces deterioration rapidly. Is hygroscopic.
Rifabutin: Amorphous red-violet powder. Soluble in chloroform and in methanol; sparingly soluble in alcohol; very slightly soluble in water.
Rifampin: Red-brown, crystalline powder. Very slightly soluble in water; freely soluble in chloroform; soluble in ethyl acetate and in methanol.
Rimexolone: White to off-white powder. Freely soluble in chloroform; sparingly soluble in methanol.
Risperidone: White or almost white powder. Soluble in methylene chloride; sparingly soluble in alcohol; practically insoluble in water.
Ritodrine Hydrochloride: White to nearly white, odorless or practically odorless, crystalline powder. Melts at about 200. Freely soluble in water and in alcohol; soluble in n-propyl alcohol; practically insoluble in ether.
Ritonavir: Freely soluble in methanol and in methylene chloride; very slightly soluble in acetonitrile; practically insoluble in water.
Ropivacaine Hydrochloride: White, crystalline powder. Soluble in water.
Rose Oil: Colorless or yellow liquid, having the characteristic odor and taste of rose. At 25 is a viscous liquid. Upon gradual cooling, changes to a translucent, crystalline mass, easily liquefied by warming. NF category: Flavors and perfumes.
Rose Water Ointment: NF category: Ointment base.
Stronger Rose Water: Practically colorless and clear, having the pleasant odor and taste of fresh rose blossoms. Is free from empyreuma, mustiness, and fungal growths. NF category: Flavors and perfumes.
Roxarsone: Pale yellow, crystalline powder. Slightly soluble in cold water; soluble in boiling water; freely soluble in acetic acid, in acetone, in alkalies, in methanol, and in dehydrated alcohol; sparingly soluble in dilute mineral acids; insoluble in ether and in ethyl acetate. Puffs up and deflagrates on heating.
Rubella Virus Vaccine Live: Solid having the characteristic appearance of substances dried from the frozen state. Undergoes loss of potency on exposure to sunlight. The Vaccine is to be constituted with a suitable diluent just prior to use.