Octoxynol 9: Clear, pale yellow, viscous liquid, having a faint odor and a bitter taste. Miscible with water, with alcohol, and with acetone. Soluble in benzene and in toluene; practically insoluble in solvent hexane. NF category: Wetting and/or solubilizing agent.

Octyldodecanol: Clear water-white, free-flowing liquid. Soluble in alcohol and in ether; insoluble in water. NF category: Vehicle (oleaginous).

Octyl Methoxycinnamate: Pale yellow oil. Insoluble in water.

Ofloxacin: Pale yellowish-white to light yellowish-white crystals or crystalline powder. Slightly soluble in alcohol, in methanol, and in water; sparingly soluble in chloroform.

Hydrophilic Ointment: NF category: Ointment base.

White Ointment: NF category: Ointment base.

Yellow Ointment: NF category: Ointment base.

Oleic Acid: Colorless to pale yellow, oily liquid when freshly prepared, but on exposure to air it gradually absorbs oxygen and darkens. Has a characteristic, lard-like odor and taste. When strongly heated in air, it is decomposed with the production of acrid vapors. Practically insoluble in water. Miscible with alcohol, with chloroform, with ether, with benzene, and with fixed and volatile oils. NF category: Emulsifying and/or solubilizing agent.

Oleovitamin A and D: Yellow to red, oily liquid, practically odorless or having a fish-like odor, and having no rancid odor or taste. Is a clear liquid at temperatures exceeding 65, and may crystallize on cooling. Is unstable in air and in light. Insoluble in water and in glycerin; very soluble in ether and in chloroform; soluble in dehydrated alcohol and in vegetable oils.

Oleovitamin A and D Capsules: The oil contained in Oleovitamin A and D Capsules is a yellow to red, oily liquid, practically odorless or having a fish-like odor, and having no rancid odor or taste. Is a clear liquid at temperatures exceeding 65, and may crystallize on cooling. Is unstable in air and in light.

Oleoyl Polyoxylglycerides: Amber, oily liquids. May develop deposit after prolonged storage at 20. Freely soluble in methylene chloride; practically insoluble but dispersible in water. NF category: Ointment base; solvent.

Oleyl Alcohol: Clear, colorless to light yellow, oily liquid. Has a faint characteristic odor and a bland taste. Insoluble in water; soluble in alcohol, in ether, in isopropyl alcohol, and in light mineral oil. NF category: Emulsifying and/or solubilizing agent.

Olive Oil: Pale yellow, or light greenish-yellow, oily liquid, having a slight, characteristic odor and taste, with a faintly acrid aftertaste. Slightly soluble in alcohol. Miscible with ether, with chloroform, and with carbon disulfide. NF category: Vehicle (oleaginous).

Omeprazole: White to off-white powder. Melts between 150 and 160, with decomposition. Soluble in dichloromethane; sparingly soluble in methanol and in alcohol; very slightly soluble in water.

Ondansetron: White to off-white powder. Very soluble in acid solutions; sparingly soluble in water.

Ondansetron Hydrochloride: White to off-white powder. Sparingly soluble in water and in alcohol; soluble in methanol; slightly soluble in isopropyl alcohol and in dichloromethane; very slightly soluble in acetone, in chloroform, and in ethyl acetate.

Opium: Has a very characteristic odor and a very bitter taste.

Powdered Opium: Light brown or moderately yellowish-brown powder.

Orphenadrine Citrate: White, practically odorless, crystalline powder, having a bitter taste. Sparingly soluble in water; slightly soluble in alcohol; insoluble in chloroform, in benzene, and in ether.

Oxacillin Sodium: Fine, white, crystalline powder, odorless or having a slight odor. Freely soluble in water, in methanol, and in dimethyl sulfoxide; slightly soluble in absolute alcohol, in chloroform, in pyridine, and in methyl acetate; insoluble in ethyl acetate, in ether, in benzene, and in ethylene chloride.

Oxacillin Sodium for Injection: Fine, white, crystalline powder, odorless or having a slight odor. Freely soluble in water, in methanol, and in dimethyl sulfoxide; slightly soluble in absolute alcohol, in chloroform, in pyridine, and in methyl acetate; insoluble in ethyl acetate, in ether, in benzene, and in ethylene chloride.

Oxandrolone: White, odorless, crystalline powder. Is stable in air, but darkens on exposure to light. Melts at about 225. Practically insoluble in water; freely soluble in chloroform; sparingly soluble in alcohol and in acetone.

Oxaprozin: White to yellowish-white, crystalline powder.

Oxazepam: Creamy white to pale yellow powder. Is practically odorless. Practically insoluble in water; slightly soluble in alcohol and in chloroform; very slightly soluble in ether.

Oxfendazole: White or almost white powder. Slightly soluble in alcohol and in methylene chloride; practically insoluble in water.

Oxprenolol Hydrochloride: White, crystalline powder. Freely soluble in alcohol, in chloroform, and in water; sparingly soluble in acetone; practically insoluble in ether.

Oxtriphylline: White, crystalline powder, having an amine-like odor. A solution (1 in 100) has a pH of about 10.3. Freely soluble in water and in alcohol; very slightly soluble in chloroform.

Oxybenzone: Pale yellow powder. Practically insoluble in water; freely soluble in alcohol and in toluene.

Oxybutynin Chloride: White, crystalline, practically odorless powder. Freely soluble in water and in alcohol; very soluble in methanol and in chloroform; soluble in acetone; slightly soluble in ether; very slightly soluble in hexane.

Oxycodone Hydrochloride: White to off-white, hygroscopic crystals or powder. Is odorless. Soluble in water; slightly soluble in alcohol.

Oxygen: Colorless, odorless, tasteless gas, which supports combustion more energetically than does air. One L at 0 and at a pressure of 760 mm of mercury weighs about 1.429 g. One volume dissolves in about 32 volumes of water and in about 7 volumes of alcohol at 20 and at a pressure of 760 mm of mercury.

Oxymetazoline Hydrochloride: White to practically white, fine crystalline powder. Is hygroscopic. Melts at about 300, with decomposition. Soluble in water and in alcohol; practically insoluble in benzene, in chloroform, and in ether.

Oxymetholone: White to creamy white, crystalline powder. Is odorless, and is stable in air. Practically insoluble in water; freely soluble in chloroform; soluble in dioxane; sparingly soluble in alcohol; slightly soluble in ether.

Oxymorphone Hydrochloride: White or slightly off-white, odorless powder. Darkens on exposure to light. Its aqueous solutions are slightly acidic. Freely soluble in water; sparingly soluble in alcohol and in ether.

Oxyquinoline Sulfate: Yellow powder. Melts at about 185. Very soluble in water; freely soluble in methanol; slightly soluble in alcohol; practically insoluble in acetone and in ether. NF category: Complexing agent.

Oxytetracycline: Pale yellow to tan, odorless, crystalline powder. Is stable in air, but exposure to strong sunlight causes it to darken. It loses potency in solutions of pH below 2, and is rapidly destroyed by alkali hydroxide solutions. Very slightly soluble in water; freely soluble in 3 N hydrochloric acid and in alkaline solutions; sparingly soluble in alcohol.

Oxytetracycline Calcium: Yellow to light brown, crystalline powder. Insoluble in water.

Oxytetracycline Hydrochloride: Yellow, odorless, crystalline powder, having a bitter taste. Is hygroscopic. Decomposes at a temperature exceeding 180, and exposure to strong sunlight or to temperatures exceeding 90 in moist air causes it to darken. Its potency is diminished in solutions having a pH below 2, and is rapidly destroyed by alkali hydroxide solutions. Freely soluble in water, but crystals of oxytetracycline base separate as a result of partial hydrolysis of the hydrochloride. Sparingly soluble in alcohol and in methanol, and even less soluble in dehydrated alcohol; insoluble in chloroform and in ether.