Acacia: Is practically odorless and produces a mucilaginous sensation on the tongue.Insoluble in alcohol.Optical rotation varies depending on the source of Acacia.For example,specific rotation values,calculated on the anhydrous basis and determined on a 1.0%(w/v)solution,usually are between -25and -35for Acacia senegal and between +35and +60for Acacia seyal.NFcategory:Emulsifying and/or solubilizing agent;suspending and/or viscosity-increasing agent;tablet binder.

Acebutolol Hydrochloride: White or almost white,crystalline powder.Soluble in alcohol and in water;very slightly soluble in acetone and in methylene chloride;practically insoluble in ether.Melts at about 141to 144.

Acesulfame Potassium: Awhite,crystalline powder or colorless crystals.Soluble in water;very slightly soluble in acetone and in alcohol.NFcategory:Sweetening agent.USP28

Acetaminophen: White,odorless,crystalline powder,having a slightly bitter taste.Soluble in boiling water and in 1Nsodium hydroxide;freely soluble in alcohol.

Acetazolamide: White to faintly yellowish-white,crystalline,odorless powder.Very slightly soluble in water;sparingly soluble in practically boiling water;slightly soluble in alcohol.

Acetic Acid: Clear,colorless liquid,having a strong,characteristic odor,and a sharply acid taste.Specific gravity is about 1.045.Miscible with water,with alcohol,and with glycerin.NFcategory:Acidifying agent;buffering agent.

Glacial Acetic Acid: Clear,colorless liquid,having a pungent,characteristic odor and,when well diluted with water,an acid taste.Boils at about 118.Specific gravity is about 1.05.Miscible with water,with alcohol,and with glycerin.NFcategory:Acidifying agent.

Acetohexamide: White,crystalline,practically odorless powder.Practically insoluble in water and in ether;soluble in pyridine and in dilute solutions of alkali hydroxides;slightly soluble in alcohol and in chloroform.

Acetohydroxamic Acid: White,slightly hygroscopic,crystalline powder.Melts,after drying at about 80for 2to 4hours,at about 88.Freely soluble in water and in alcohol;very slightly soluble in chloroform.

Acetone: Transparent,colorless,mobile,volatile liquid,having a characteristic odor.Asolution (1in 2)is neutral to litmus.Miscible with water,with alcohol,with ether,with chloroform,and with most volatile oils.NFcategory:Solvent.

Acetylcholine Chloride: White or off-white crystals or crystalline powder.Very soluble in water;freely soluble in alcohol;insoluble in ether.Is decomposed by hot water and by alkalies.

Acetylcysteine: White,crystalline powder,having a slight acetic odor.Freely soluble in water and in alcohol;practically insoluble in chloroform and in ether.

Acetyltributyl Citrate: Clear,practically colorless,oily liquid.Insoluble in water;freely soluble in alcohol,in isopropyl alcohol,in acetone,and in toluene.NFcategory:Plasticizer.

Acetyltriethyl Citrate: Clear,practically colorless,oily liquid.Insoluble in water;freely soluble in alcohol,in isopropyl alcohol,in acetone,and in toluene.NFcategory:Plasticizer.

Acyclovir: White to off-white,crystalline powder.Melts at temperatures higher than 250,with decomposition.Slightly soluble in water;soluble in diluted hydrochloric acid;insoluble in alcohol.

Adenine: White crystals or crystalline powder.Is odorless and tasteless.Very slightly soluble in water;sparingly soluble in boiling water;slightly soluble in alcohol;practically insoluble in ether and in chloroform.

Adenosine: White,odorless,crystalline powder.Soluble in water;practically insoluble in alcohol.Melts at about 235.

Adipic Acid: Awhite,crystalline powder.Freely soluble in alcohol and in methanol;soluble in boiling water and in acetone;slightly soluble in water.NFcategory:Buffering agent.USP28

Agar: Odorless or has a slight odor,and produces a mucilaginous sensation on the tongue.Insoluble in cold water;soluble in boiling water.NFcategory:Suspending and/or viscosity-increasing agent.

Alamic Acid: NFcategory:Suspending and/or viscosity-increasing agent.

Alanine: White,odorless crystals or crystalline powder,having a slightly sweet taste.Freely soluble in water;slightly soluble in 80%alcohol;insoluble in ether.

Albendazole: White to faintly yellowish powder.Freely soluble in anhydrous formic acid;very slightly soluble in ether and in methylene chloride;practically insoluble in alcohol and in water.

Albumin Human: Practically odorless,moderately viscous,clear,brownish fluid.

Albuterol: White,crystalline powder.Sparingly soluble in water;soluble in alcohol.Melts at about 156.

Albuterol Sulfate: White or practically white powder.Freely soluble in water;slightly soluble in alcohol,in chloroform,and in ether.

Alcohol: Clear,colorless,mobile,volatile liquid.Has a characteristic odor and produces a burning sensation on the tongue.Is readily volatilized even at low temperatures,and boils at about 78.Is flammable.Miscible with water and with practically all organic solvents.NFcategory:Solvent.

Dehydrated Alcohol: Clear,colorless,mobile,volatile liquid.Has a characteristic odor and produces a burning sensation on the tongue.Is readily volatilized even at low temperatures,and boils at about 78.Is flammable.Miscible with water and with practically all organic solvents.

Diluted Alcohol: Clear,colorless,mobile liquid,having a characteristic odor and producing a burning sensation on the tongue.NFcategory:Solvent.

Rubbing Alcohol: Transparent,colorless,or colored as desired,mobile,volatile liquid.Has an extremely bitter taste and,in the absence of added odorous constituents,a characteristic odor.Is flammable.

Alendronate Sodium: White,free-flowing powder.Soluble in water;very slightly soluble in dimethyl sulfoxide,in methyl alcohol,and in propylene glycol;practically insoluble in acetone,in acetonitrile,in alcohol,in chloroform,and in isopropyl alcohol.USP28

Alfadex: Awhite or almost white,amorphous or crystalline powder.Freely soluble in water and in propylene glycol;practically insoluble in ethanol and in methylene chloride.USP28

Alfentanil Hydrochloride: White to almost white powder.Soluble in water;freely soluble in methanol,in alcohol,and in chloroform;sparingly soluble in acetone.Melting point range,crystals from acetone:136–143(anhydrous)and reported as crystals from aqueous hydrochloric acid:116–126(monohydrate).

Alfentanil Injection: Clear,colorless solution.

Alginic Acid: White to yellowish-white,fibrous powder.Is odorless,or practically odorless,and is tasteless.Insoluble in water and in organic solvents;soluble in alkaline solutions.NFcategory:Tablet binder;tablet disintegrant.

Alkyl (C12-15)Benzoate: Clear,practically colorless,oily liquid.Soluble in acetone,in alcohol,in isopropyl alcohol,in ethyl acetate,in isopropyl myristate,in isopropyl palmitate,in lanolin,in mineral oil,in vegetable oils,and in volatile silicones;insoluble in water,in glycerin,and in propylene glycol.NFcategory:Vehicle (oleaginous);emollient.

Allantoin: White,crystalline powder.Slightly soluble in water;very slightly soluble in alcohol.Melts at about 225,with decomposition.

Allopurinol: Fluffy white to off-white powder,having only a slight odor.Very slightly soluble in water and in alcohol;soluble in solutions of potassium and sodium hydroxides;practically insoluble in chloroform and in ether.

Allyl Isothiocyanate: Colorless to pale yellow,very refractive,liquid.Pungent irritating odor,acrid taste.[Caution:Lachrymator. ]Miscible with alcohol,with carbon disulfide,and with ether.Slightly soluble in water.

Almond Oil: Clear,pale straw-colored or colorless,oily liquid,having a bland taste.Remains clear at -10,and does not congeal until cooled to almost -20.Slightly soluble in alcohol;miscible with ether,with chloroform,with benzene,and with solvent hexane.NFcategory:Flavors and perfumes.

Aloe: Has a characteristic,somewhat sour and disagreeable,odor.

Alprazolam: Awhite to off-white,crystalline powder.Melts at about 225.Insoluble in water;slightly soluble in ethyl acetate;sparingly soluble in acetone;soluble in alcohol;freely soluble in chloroform.

Alprostadil: Awhite to off-white,crystalline powder.Melts at about 110.Soluble in water;freely soluble in alcohol;soluble in acetone;slightly soluble in ethyl acetate;very slightly soluble in chloroform and in ether.

Altretamine: White crystalline powder.Soluble in chloroform;insoluble in water.

Ammonium Alum: Large,colorless crystals,crystalline fragments,or white powder.Is odorless,and has a sweetish,strongly astringent taste.Its solutions are acid to litmus.Freely soluble in water;very soluble in boiling water;freely but slowly soluble in glycerin;insoluble in alcohol.

Potassium Alum: Large,colorless crystals,crystalline fragments,or white powder.Is odorless,and has a sweetish,strongly astringent taste.Its solutions are acid to litmus.Freely soluble in water;very soluble in boiling water;freely but slowly soluble in glycerin;insoluble in alcohol.

Aluminum Acetate Topical Solution: Clear,colorless liquid having a faint odor of acetic acid,and a sweetish,astringent taste.Specific gravity is about 1.02.

Aluminum Chloride: White,or yellowish-white,deliquescent,crystalline powder.Is practically odorless,and has a sweet,very astringent taste.Its solutions are acid to litmus.Very soluble in water;freely soluble in alcohol;soluble in glycerin.

Aluminum Hydroxide Gel: White,viscous suspension,from which small amounts of clear liquid may separate on standing.

Dried Aluminum Hydroxide Gel: White,odorless,tasteless,amorphous powder.Insoluble in water and in alcohol;soluble in dilute mineral acids and in solutions of fixed alkali hydroxides.

Aluminum Monostearate: Fine,white to yellowish-white,bulky powder,having a faint,characteristic odor.Insoluble in water,in alcohol,and in ether.NFcategory:Suspending and/or viscosity-increasing agent.

Aluminum Phosphate Gel: White,viscous suspension from which small amounts of water separate on standing.

Aluminum Subacetate Topical Solution: Clear,colorless or faintly yellow liquid,having an odor of acetic acid and an acid reaction to litmus.Gradually becomes turbid on standing,through separation of a more basic salt.

Aluminum Sulfate: White,crystalline powder,shining plates,or crystalline fragments.Is stable in air.Is odorless,and has a sweet taste,becoming mildly astringent.Freely soluble in water;insoluble in alcohol.

Amantadine Hydrochloride: White or practically white,crystalline powder,having a bitter taste.Freely soluble in water;soluble in alcohol and in chloroform.

Amifostine: White,crystalline powder.Freely soluble in water.

Amikacin: White,crystalline powder.Sparingly soluble in water.

Amikacin Sulfate: White,crystalline powder.Freely soluble in water.

Amiloride Hydrochloride: Yellow to greenish-yellow,odorless or practically odorless powder.Slightly soluble in water;insoluble in ether,in ethyl acetate,in acetone,and in chloroform;freely soluble in dimethyl sulfoxide;sparingly soluble in methanol.

Aminobenzoate Potassium: White,crystalline powder.The pHof a 1in 100solution in water is about 7.Very soluble in water;soluble in alcohol;practically insoluble in ether.

Aminobenzoic Acid: White or slightly yellow,odorless crystals or crystalline powder.Discolors on exposure to air or light.Slightly soluble in water and in chloroform;freely soluble in alcohol and in solutions of alkali hydroxides and carbonates;sparingly soluble in ether.

Aminobenzoic Acid Topical Solution: Straw-colored solution having the odor of alcohol.

Aminocaproic Acid: Fine,white,crystalline powder.Is odorless,or practically odorless.Its solutions are neutral to litmus.Melts at about 205.Freely soluble in water,in acids,and in alkalies;slightly soluble in methanol and in alcohol;practically insoluble in chloroform and in ether.

Aminoglutethimide: Fine,white,or creamy white,crystalline powder.Very slightly soluble in water;readily soluble in most organic solvents.Forms water-soluble salts with strong acids.

Aminohippuric Acid: White,crystalline powder.Discolors on exposure to light.Melts at about 195,with decomposition.Sparingly soluble in water and in alcohol;freely soluble in alkaline solutions,with some decomposition,and in diluted hydrochloric acid;very slightly soluble in benzene,in carbon tetrachloride,in chloroform,and in ether.

Aminopentamide Sulfate: White,crystalline powder.Freely soluble in water and in alcohol;very slightly soluble in chloroform;practically insoluble in ether.

Aminophylline: White or slightly yellowish granules or powder,having a slight ammoniacal odor and a bitter taste.Upon exposure to air,it gradually loses ethylenediamine and absorbs carbon dioxide with the liberation of free theophylline.Its solutions are alkaline to litmus.One g dissolves in 25mLof water to give a clear solution;1g dissolved in 5mLof water crystallizes upon standing,but redissolves when a small amount of ethylenediamine is added.Insoluble in alcohol and in ether.

Aminophylline Tablets: May have a faint ammoniacal odor.

Aminosalicylate Sodium: White to cream-colored,crystalline powder.Is practically odorless,and has a sweet,saline taste.Its solutions decompose slowly and darken in color.Freely soluble in water;sparingly soluble in alcohol;very slightly soluble in ether and in chloroform.

Aminosalicylic Acid: White or practically white,bulky powder,that darkens on exposure to light and air.Is odorless,or has a slight acetous odor.Slightly soluble in water and in ether;soluble in alcohol;practically insoluble in benzene.

Amitriptyline Hydrochloride: White or practically white,odorless or practically odorless,crystalline powder or small crystals.Freely soluble in water,in alcohol,in chloroform,and in methanol;insoluble in ether.

Strong Ammonia Solution: Clear,colorless liquid,having an exceedingly pungent,characteristic odor.Specific gravity is about 0.90.NFcategory:Alkalizing agent.

Aromatic Ammonia Spirit: Practically colorless liquid when recently prepared,but gradually acquiring a yellow color on standing.Has the taste of ammonia,has an aromatic and pungent odor,and is affected by light.Specific gravity is about 0.90.

Ammonio Methacrylate Copolymer: Colorless,clear to white-opaque granules or a white powder,both with a faint amine-like odor.Soluble to freely soluble in methanol,in alcohol,and in isopropyl alcohol,each of which contains small amounts of water;soluble to freely soluble in acetone,in ethyl acetate,and in methylene chloride.The solutions are clear to slightly cloudy.Insoluble in petroleum ether and in water.NFcategory:Coating agent.

Ammonio Methacrylate Copolymer Dispersion: Milky-white liquids of low viscosity with a faint characteristic odor.Miscible with water in any proportion,the milky-white appearance being retained.Aclear or slightly cloudy solution is obtained on mixing one part with five parts of acetone,alcohol,or isopropyl alcohol.When mixed with methanol in a ratio of 1:5,Ammonio Methacrylate Copolymer Dispersion Type Adissolves completely,and Ammonio Methacrylate Copolymer Dispersion Type Bdissolves only partially.NFcategory:Coating agent;polymer membrane;tablet binder.

Ammonium Carbonate: White powder,or hard,white or translucent masses,having a strong odor of ammonia,without empyreuma,and a sharp,ammoniacal taste.Its solutions are alkaline to litmus.On exposure to air,it loses ammonia and carbon dioxide,becoming opaque,and is finally converted into friable porous lumps or a white powder of ammonium bicarbonate.Freely soluble in water,but is decomposed by hot water.NFcategory:Alkalizing agent;buffering agent.

Ammonium Chloride: Colorless crystals or white,fine or coarse,crystalline powder.Has a cool,saline taste,and is somewhat hygroscopic.Freely soluble in water and in glycerin,and even more so in boiling water;sparingly soluble in alcohol.

Ammonium Molybdate: Colorless or slightly greenish or yellowish crystals.Soluble in water;practically insoluble in alcohol.

Ammonium Phosphate: Colorless or white granules or powder,having a saline taste.Freely soluble in water;practically insoluble in acetone and in alcohol.NFcategory:Buffering agent.

Ammonium Sulfate: Colorless or white crystals or granules that decompose at temperatures above 280.One g is soluble in about 1.5mLof water.It is insoluble in alcohol.The pHof a 0.1Msolution is between 4.5and 6.0.

Amobarbital Sodium: White,friable,granular powder.Is odorless,has a bitter taste,and is hygroscopic.Its solutions decompose on standing,heat accelerating the decomposition.Very soluble in water;soluble in alcohol;practically insoluble in ether and in chloroform.

Amodiaquine: Very pale yellow to light tan-yellow,odorless powder.Practically insoluble in water;sparingly soluble in 1.0Nhydrochloric acid;slightly soluble in alcohol.

Amodiaquine Hydrochloride: Yellow,crystalline powder.Is odorless and has a bitter taste.Soluble in water;sparingly soluble in alcohol;very slightly soluble in benzene,in chloroform,and in ether.

Amoxapine: White to yellowish crystalline powder.Freely soluble in chloroform;soluble in tetrahydrofuran;sparingly soluble in methanol and in toluene;slightly soluble in acetone;practically insoluble in water.

Amoxicillin: White,practically odorless,crystalline powder.Slightly soluble in water and in methanol;insoluble in benzene,in carbon tetrachloride,and in chloroform.

Amphetamine Sulfate: White,odorless,crystalline powder,having a slightly bitter taste.Its solutions are acid to litmus,having a pHof 5to 6.Freely soluble in water;slightly soluble in alcohol;practically insoluble in ether.

Amphotericin B: Yellow to orange powder;odorless or practically so.Insoluble in water,in anhydrous alcohol,in ether,in benzene,and in toluene;soluble in dimethylformamide,in dimethyl sulfoxide,and in propylene glycol;slightly soluble in methanol.

Amphotericin Bfor Injection: It yields a colloidal dispersion in water.

Ampicillin: White,practically odorless,crystalline powder.Slightly soluble in water and in methanol;insoluble in benzene,in carbon tetrachloride,and in chloroform.

Ampicillin Sodium: White to off-white,odorless or practically odorless,crystalline powder.Is hygroscopic.Very soluble in water and in isotonic sodium chloride and dextrose solutions.

Amprolium (C14H19ClN4·HCl): White to light yellow powder.Freely soluble in water,in methanol,in alcohol,and in dimethylformamide;sparingly soluble in dehydrated alcohol;practically insoluble in isopropyl alcohol,in butyl alcohol,and in acetone.

Amyl Nitrite: Clear,yellowish liquid,having a peculiar,ethereal,fruity odor.Is volatile even at low temperatures,and is flammable.Boils at about 96.Practically insoluble in water.Miscible with alcohol and with ether.

Amylene Hydrate: Clear,colorless liquid,having a camphoraceous odor.Its solutions are neutral to litmus.Freely soluble in water.Miscible with alcohol,with chloroform,with ether,and with glycerin.NFcategory:Solvent.

Anethole: Colorless or faintly yellow liquid at or above 23.Has a sweet taste and the aromatic odor of anise.Is affected by light.Very slightly soluble in water;freely soluble in alcohol.Readily miscible with ether and with chloroform.NFcategory:Flavors and perfumes.

Anileridine: White to yellowish-white,odorless to practically odorless,crystalline powder.Is oxidized on exposure to air and light,becoming darker in color.It exhibits polymorphism,and of two crystalline forms observed,one melts at about 80and the other at about 89.Very slightly soluble in water;freely soluble in alcohol and in chloroform;soluble in ether although it may show turbidity.

Anileridine Hydrochloride: White or nearly white,odorless,crystalline powder.Is stable in air.Melts at about 270,with decomposition.Freely soluble in water;sparingly soluble in alcohol;practically insoluble in ether and in chloroform.

Antazoline Phosphate: White to off-white,crystalline powder,having a bitter taste.Soluble in water;sparingly soluble in methanol;practically insoluble in benzene and in ether.

Anthralin: Yellowish-brown,crystalline powder.Is odorless and tasteless.Insoluble in water;soluble in chloroform,in acetone,in benzene,and in solutions of alkali hydroxides;slightly soluble in alcohol,in ether,and in glacial acetic acid.

Anticoagulant Citrate Dextrose Solution: Clear,colorless,odorless liquid.Is dextrorotatory.

Anticoagulant Citrate Phosphate Dextrose Solution: Clear,colorless to slightly yellow,odorless liquid.Is dextrorotatory.

Anticoagulant Sodium Citrate Solution: Clear and colorless liquid.

Antihemophilic Factor: White or yellowish powder.On constitution is opalescent with a slight blue tinge or is a yellowish liquid.

Cryoprecipitated Antihemophilic Factor: Yellowish,frozen solid.On thawing becomes a very viscous,yellow,gummy liquid.

Antimony Potassium Tartrate: Colorless,odorless,transparent crystals,or white powder.The crystals effloresce upon exposure to air and do not readily rehydrate even on exposure to high humidity.Its solutions are acid to litmus.Freely soluble in boiling water;soluble in water and in glycerin;insoluble in alcohol.

Antimony Sodium Tartrate: Colorless,odorless,transparent crystals,or white powder.The crystals effloresce upon exposure to air.Freely soluble in water;insoluble in alcohol.

Antipyrine: Colorless crystals,or white,crystalline powder.Is odorless and has a slightly bitter taste.Its solutions are neutral to litmus.Very soluble in water;freely soluble in alcohol and in chloroform;sparingly soluble in ether.

Antivenin (Crotalidae)Polyvalent: Solid exhibiting the characteristic structure of a freeze-dried solid;light cream in color.

Antivenin (Micrurus Fulvius): Solid exhibiting the characteristic structure of a freeze-dried solid;light cream in color.

Apomorphine Hydrochloride: Minute,white or grayish-white,glistening crystals or white powder.Is odorless.It gradually acquires a green color on exposure to light and air.Its solutions are neutral to litmus.Sparingly soluble in water and in alcohol;soluble in water at 80;very slightly soluble in chloroform and in ether.

Apraclonidine Hydrochloride: White to off-white,odorless to practically odorless powder.Soluble in methanol;sparingly soluble in water and in alcohol;insoluble in chloroform,in ethyl acetate,and in hexanes.

Arginine: White,practically odorless crystals.Freely soluble in water;sparingly soluble in alcohol;insoluble in ether.

Arginine Hydrochloride: White crystals or crystalline powder,practically odorless.Freely soluble in water.

Aromatic Elixir: NFcategory:Flavored and/or sweetened vehicle.

Arsanilic Acid: White to off-white,crystalline powder.Melts at about 232.Soluble in hot water,in amyl alcohol,and in solutions of alkali carbonates;sparingly soluble in concentrated mineral acids;slightly soluble in cold water,in alcohol,and in acetic acid;insoluble in acetone,in benzene,in chloroform,in ether,and in dilute mineral acids.

Ascorbic Acid: White or slightly yellow crystals or powder.On exposure to light it gradually darkens.In the dry state,is reasonably stable in air,but in solution rapidly oxidizes.Melts at about 190.Freely soluble in water;sparingly soluble in alcohol;insoluble in chloroform,in ether,and in benzene.NFcategory:Antioxidant.

Ascorbyl Palmitate: White to yellowish white powder,having a characteristic odor.Very slightly soluble in water and in vegetable oils;soluble in alcohol.NFcategory:Antioxidant.

Asparagine: White crystals or a crystalline powder.Soluble in water;practically insoluble in alcohol and in ether.Its solutions are acid to litmus.It melts at about 234.USP28

Aspartame: White,odorless,crystalline powder,having a sweet taste.Sparingly soluble in water;slightly soluble in alcohol.Melts at about 246.The pHof an 8in 1000solution is about 5.NFcategory:Sweetening agent.

Aspartame Acesulfame: White,odorless,crystalline powder.Slightly soluble in water and in ethanol.NFcategory:Sweetening agent.

Aspartic Acid: White or almost white,crystalline powder,or colorless crystals.Soluble in dilute solutions of alkali hydroxides and in dilute mineral acids;slightly soluble in water;practically insoluble in alcohol and in ether.

Aspirin: White crystals,commonly tabular or needle-like,or white,crystalline powder.Is odorless or has a faint odor.Is stable in dry air;in moist air it gradually hydrolyzes to salicylic and acetic acids.Slightly soluble in water;freely soluble in alcohol;soluble in chloroform and in ether;sparingly soluble in absolute ether.

Atenolol: White or practically white,odorless powder.Melting point 146–148(crystals from ethyl acetate).Freely soluble in methanol;sparingly soluble in alcohol;slightly soluble in water and in isopropanol.

Atovaquone: Yellow powder.Freely soluble in N-methyl-2-pyrrolidone and in tetrahydrofuran;soluble in chloroform;sparingly soluble in acetone,in di-n-butyl adipate,in dimethyl sulfoxide,and in polyethylene glycol 400;slightly soluble in alcohol,in 1,3-butanediol,in ethyl acetate,in glycerin,in octanol,and in polyethylene glycol 200;very slightly soluble in 0.1Nsodium hydroxide;insoluble in water.

Atracurium Besylate: White to off-white solid.

Atropine: White crystals,usually needle-like,or white,crystalline powder.Its saturated solution is alkaline to phenolphthalein TS.Is optically inactive,but usually contains some levorotatory hyoscyamine.Slightly soluble in water,and sparingly soluble in water at 80;freely soluble in alcohol and in chloroform;soluble in glycerin and in ether.

Atropine Sulfate: Colorless crystals,or white,crystalline powder.Odorless;effloresces in dry air;is slowly affected by light.Very soluble in water;freely soluble in alcohol and even more so in boiling alcohol;freely soluble in glycerin.

Activated Attapulgite: Cream-colored,micronized,nonswelling powder,free from gritty particles.The high heat treatment used in its preparation causes it to yield only moderately viscous aqueous suspensions,its dispersion consisting mainly of particle groups.Insoluble in water.

Colloidal Activated Attapulgite: Cream-colored,micronized,non-swelling powder,free from gritty particles.Yields viscous aqueous suspensions,as a result of dispersion into its constituent ultimate particles.Insoluble in water.

Aurothioglucose: Yellow,odorless or practically odorless powder.Is stable in air.An aqueous solution is unstable on long standing.The pHof its 1in 100solution is about 6.3.Freely soluble in water;practically insoluble in acetone,in alcohol,in chloroform,and in ether.

Azatadine Maleate: White to light cream-colored,odorless powder.Melts at about 153.Freely soluble in water,in alcohol,in chloroform,and in methanol;practically insoluble in benzene and in ether.

Azathioprine: Pale yellow,odorless powder.Insoluble in water;soluble in dilute solutions of alkali hydroxides;sparingly soluble in dilute mineral acids;very slightly soluble in alcohol and in chloroform.

Azathioprine Sodium for Injection: Bright yellow,hygroscopic,amorphous mass or cake.

Aztreonam: White,odorless,crystalline powder.Soluble in dimethylformamide and in dimethyl sulfoxide;slightly soluble in methanol;very slightly soluble in dehydrated alcohol;practically insoluble in ethyl acetate,in chloroform,and in toluene.