Nabumetone: Awhite,or almost white,crystalline powder.Freely soluble in acetone;sparingly soluble in alcohol and in methanol;practically insoluble in water.

Nadolol: White to off-white,practically odorless,crystalline powder.Freely soluble in alcohol and in methanol;soluble in water at pH2;slightly soluble in chloroform,in methylene chloride,in isopropyl alcohol,and in water (between pH7and pH10);insoluble in acetone,in benzene,in ether,in hexane,and in trichloroethane.

Nafcillin Sodium: White to yellowish-white powder,having not more than a slight characteristic odor.Freely soluble in water and in chloroform;soluble in alcohol.

Nalidixic Acid: White to very pale yellow,odorless,crystalline powder.Soluble in chloroform,in methylene chloride,and in solutions of fixed alkali hydroxides and carbonates;slightly soluble in acetone,in alcohol,in methanol,and in toluene;very slightly soluble in ether and in water.

Naloxone Hydrochloride: White to slightly off-white powder.Its aqueous solution is acidic.Soluble in water,in dilute acids,and in strong alkali;slightly soluble in alcohol;practically insoluble in ether and in chloroform.

Naloxone Hydrochloride Injection: Clear,colorless liquid.

Nandrolone Decanoate: Fine,white to creamy white,crystalline powder.Is odorless,or may have a slight odor.Practically insoluble in water;soluble in chloroform,in alcohol,in acetone,and in vegetable oils.

Naphazoline Hydrochloride: White,crystalline powder.Is odorless and has a bitter taste.Melts at a temperature of about 255,with decomposition.Freely soluble in water and in alcohol;very slightly soluble in chloroform;practically insoluble in ether.

Naproxen: White to off-white,practically odorless,crystalline powder.Practically insoluble in water;freely soluble in chloroform and in dehydrated alcohol;soluble in alcohol;sparingly soluble in ether.

Naproxen Sodium: White to creamy crystalline powder.Soluble in water and in methanol;sparingly soluble in alcohol;very slightly soluble in acetone;and practically insoluble in chloroform and in toluene.Melts at about 255,with decomposition.

Narasin: White to off-white,crystalline powder.Melts at about 217,with decomposition.Soluble in methanol and in water.

Naratriptan Hydrochloride: White to pale yellow solid.Soluble in water.

Natamycin: Off-white to cream-colored powder,which may contain up to 3moles of water.Practically insoluble in water;slightly soluble in methanol;soluble in glacial acetic acid and in dimethylformamide.

Neomycin Sulfate: White to slightly yellow powder,or cryodesiccated solid.Is odorless or practically so and is hygroscopic.Its solutions are dextrorotatory.Freely soluble in water;very slightly soluble in alcohol;insoluble in acetone,in chloroform,and in ether.

Netilmicin Sulfate: White to pale yellowish-white powder.Freely soluble in water;practically insoluble in dehydrated alcohol and in ether.

Nevirapine: White to off-white,odorless to nearly odorless,crystalline powder.Practically insoluble in water;slightly soluble in alcohol and in methanol.Hydrous form also slightly insoluble in propylene glycol.USP28

Niacin: White crystals or crystalline powder.Is odorless,or has a slight odor.Melts at about 235.Sparingly soluble in water;freely soluble in boiling water,in boiling alcohol,and in solutions of alkali hydroxides and carbonates;practically insoluble in ether.

Niacinamide: White,crystalline powder.Is odorless or practically so,and has a bitter taste.Its solutions are neutral to litmus.Freely soluble in water and in alcohol;soluble in glycerin.

Nifedipine: Yellow powder.Is affected by exposure to light.Practically insoluble in water;freely soluble in acetone.

Nimodipine: Light yellow or yellow,crystalline powder,affected by light.Freely soluble in ethyl acetate;sparingly soluble in alcohol;practically insoluble in water.Exhibits polymorphism.

Nitric Acid: Highly corrosive fuming liquid,having a characteristic,highly irritating odor.Stains animal tissues yellow.Boils at about 120.Specific gravity is about 1.41.NFcategory:Acidifying agent.

Nitrofurantoin: Lemon-yellow,odorless crystals or fine powder.Has a bitter aftertaste.Very slightly soluble in water and in alcohol;soluble in dimethylformamide.

Nitrofurazone: Lemon yellow,odorless,crystalline powder.Darkens slowly on exposure to light.Melts at about 236,with decomposition.Very slightly soluble in alcohol and in water;soluble in dimethylformamide;slightly soluble in propylene glycol and in polyethylene glycol mixtures;practically insoluble in chloroform and in ether.

Nitrofurazone Ointment: Yellow,opaque,and water-miscible,and has ointment-like consistency.

Nitrofurazone Topical Solution: Light yellow,clear,somewhat viscous liquid,having a faint characteristic odor.Miscible with water.

Nitrogen: Colorless,odorless,tasteless gas.Is nonflammable and does not support combustion.One liter at 0and at a pressure of 760mm of mercury weighs about 1.251g.One volume dissolves in about 65volumes of water and in about 9volumes of alcohol at 20and at a pressure of 760mm of mercury.NFcategory:Air displacement.

Diluted Nitroglycerin: When diluted with lactose,it is a white,odorless powder.When diluted with propylene glycol or alcohol,it is a clear,colorless,or pale yellow liquid.[NOTE—Undiluted nitroglycerin occurs as a white to pale yellow,thick,flammable,explosive liquid.]Undiluted nitroglycerin is slightly soluble in water;soluble in methanol,in alcohol,in carbon disulfide,in acetone,in ethyl ether,in ethyl acetate,in glacial acetic acid,in benzene,in toluene,in nitrobenzene,in phenol,in chloroform,and in methylene chloride.

Nitromersol: Brownish yellow to yellow granules or brownish yellow to yellow powder.Is odorless and tasteless and is affected by light.Very slightly soluble in water,in alcohol,in acetone,and in ether;soluble in solutions of alkalies and of ammonia by opening of the anhydride ring and the formation of a salt.

Nitromersol Topical Solution: Clear,reddish-orange solution.Is affected by light.

Nitrous Oxide: Colorless gas,without appreciable odor or taste.One liter at 0and at a pressure of 760mm of mercury weighs about 1.97g.One volume dissolves in about 1.4volumes of water at 20and at a pressure of 760mm of mercury.Freely soluble in alcohol;soluble in ether and in oils.

Nizatidine: Off-white to buff crystalline solid.Freely soluble in chloroform;soluble in methanol;sparingly soluble in water.

Nonoxynol 9: Clear,colorless to light yellow,viscous liquid.Soluble in water,in alcohol,and in corn oil.

Norepinephrine Bitartrate: White or faintly gray,odorless,crystalline powder.Slowly darkens on exposure to air and light.Its solutions are acid to litmus,having a pHof about 3.5.Freely soluble in water;slightly soluble in alcohol;practically insoluble in chloroform and in ether.Melts between 98and 104,without previous drying of the specimen,the melt being turbid.

Norepinephrine Bitartrate Injection: Colorless or practically colorless liquid,gradually turning dark on exposure to air and light.

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

Norethindrone Acetate: White to creamy white,odorless,crystalline powder.Practically insoluble in water;very soluble in chloroform;freely soluble in dioxane;soluble in ether and in alcohol.

Norethynodrel: White or practically white,odorless,crystalline powder.Melts at about 175,over a range of about 3.Is stable in air.Very slightly soluble in water and in solvent hexane;freely soluble in chloroform;soluble in acetone;sparingly soluble in alcohol.

Norfloxacin: White to pale yellow,crystalline powder.Sensitive to light and moisture.Slightly soluble in acetone,in water,and in alcohol;freely soluble in acetic acid;sparingly soluble in chloroform;very slightly soluble in methanol and in ethyl acetate;insoluble in ether.

Norgestimate: White to pale yellow powder.Freely to very soluble in methylene chloride;insoluble in water;sparingly soluble in acetonitrile.

Norgestrel: White or practically white,practically odorless,crystalline powder.Insoluble in water;freely soluble in chloroform;sparingly soluble in alcohol.

Nortriptyline Hydrochloride: White to off-white powder,having a slight,characteristic odor.Its solution (1in 100)has a pHof about 5.Soluble in water and in chloroform;sparingly soluble in methanol;practically insoluble in ether,in benzene,and in most other organic solvents.

Noscapine: Fine,white or practically white,crystalline powder.Freely soluble in chloroform;soluble in acetone;slightly soluble in alcohol and in ether;practically insoluble in water.

Novobiocin Calcium: White or yellowish-white,odorless,crystalline powder.Slightly soluble in water and in ether;freely soluble in alcohol and in methanol;sparingly soluble in acetone and in butyl acetate;very slightly soluble in chloroform.

Novobiocin Sodium: White or yellowish-white,odorless,hygroscopic,crystalline powder.Freely soluble in water,in alcohol,in methanol,in glycerin,and in propylene glycol;slightly soluble in butyl acetate;practically insoluble in acetone,in chloroform,and in ether.

Nystatin: Yellow to light tan powder,having an odor suggestive of cereals.Is hygroscopic,and is affected by long exposure to light,heat,and air.Freely soluble in dimethylformamide and in dimethyl sulfoxide;slightly to sparingly soluble in methanol,in n-propyl alcohol,and in n-butyl alcohol;practically insoluble in water and in alcohol;insoluble in chloroform and in ether.