Composition of and method for preparing stable particles in a frozen aqueous matrix

Abstract

The present invention discloses a composition of a stable suspension of a poorly water soluble pharmaceutical agent or cosmetic in the form of particles of the pharmaceutical agent or cosmetic suspended in a frozen aqueous matrix and method for its preparation. The composition is stable for a prolonged period of time, preferably six months or longer and is suitable for parenteral, oral, or non-oral routes such as pulmonary (inhalation), ophthalmic, or topical administration.

1 . A composition of a suspension of a poorly water soluble compound comprising particles of a crystalline phase pharmaceutical agent or an amorphous phase pharmaceutical agent in a frozen aqueous matrix, wherein the compound has a solubility in water of less than 10.0 mg/ml, and wherein about over 99% of the particles have a particle size of less than about 5 microns.  
   
   
       2 . (canceled)  
   
   
       3 . (canceled)  
   
   
       4 . The composition according to  claim 1 , wherein the pharmaceutical agent is selected from the group consisting of: therapeutic agents and diagnostic agents.  
   
   
       5 . The composition according to  claim 4 , wherein the therapeutic agent is selected from the group consisting of analgesics, anti-inflammatory agents, anthelmintics, anti-arrhythmic agents, antibiotics, anticoagulants, antidepressants, antidiabetic agents, antiepileptics, antifungals, antihistamines, antihypertensive agents, antimuscarinic agents, antimycobacterial agents, antineoplastic agents, antiprotozoal agents, immunosuppressants, immunostimulants, antithyroid agents, antiviral agents, anxiolytic sedatives, astringents, beta-adrenoceptor blocking agents, contrast media, corticosteroids, cough suppressants, diagnostic agents, diagnostic imaging agents, diuretics, dopaminergics, haemostatics, immunological agents, lipid regulating agents, muscle relaxants, parasympathomimetics, parathyroid calcitonin, prostaglandins, radio-pharmaceuticals, sex hormones, anti-allergic agents, stimulants, sympathomimetics, thyroid agents, vasodilators, vaccines and xanthines  
   
   
       6 . (canceled)  
   
   
       7 . The composition according to  claim 1 , wherein the pharmaceutical agent is present in an amount of from about 0.01 to about 50% by weight based on the total weight of the composition.  
   
   
       8 . The composition according to  claim 1 , wherein the particle size of the pharmaceutical agent is about 50 nm to 50 microns.  
   
   
       9 . The composition according to  claim 1 , wherein the mean diameter of the particles of the pharmaceutical agent is about 50 nm to 2 microns.  
   
   
       10 . (canceled)  
   
   
       11 . The composition according to  claim 1 , further comprising one or more excipients selected from the group consisting of: surface modifiers, pH adjusting agents, crystal growth modifiers, cryopreservation agents, osmotic agents, co-solvents, and viscosity modulating agents.  
   
   
       12 . The composition according to  claim 11 , wherein the surface modifier is selected from the group consisting of: anionic surfactants, cationic surfactants, nonionic surfactants and surface active biological modifiers.  
   
   
       13 . The composition according to  claim 12 , wherein the nonionic surfactant is selected from the group consisting of: polyoxyethylene fatty alcohol ethers, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene-derivatized lipids such as mPEG-PSPC (palmitoyl-stearoyl-phophatidylcholine), mPEG-PSPE (palmitoyl-stearoyl-phophatidylethanolamine), sorbitan esters, glycerol monostearate, polyethylene glycols, polypropylene glycols, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, aryl alkyl polyether alcohols, polyoxyethylene-polyoxypropylene copolymers, polaxamines, methylcellulose, hydroxycellulose, hydroxy propylcellulose, hydroxy propylmethylcellulose, noncrystalline cellulose, polysaccharides, starch, starch derivatives, hydroxyethylstarch, polyvinyl alcohol, and polyvinylpyrrolidone.  
   
   
       14 . The composition according to  claim 12 , wherein the anionic surfactant is selected from the group consisting of: potassium laurate, triethanolamine stearate, sodium lauryl sulfate, sodium dodecylsulfate, alkyl polyoxyethylene sulfates, sodium alginate, dioctyl sodium sulfosuccinate, glyceryl esters, sodium carboxymethylcellulose, bile acids and their salts, cholic acid, deoxycholic acid, glycocholic acid, taurocholic acid, glycodeoxycholic acid, and calcium carboxymethylcellulose.  
   
   
       15 . The composition according to  claim 12 , wherein the cationic surfactant is selected from the group consisting of quaternary ammonium compounds, benzalkonium chloride, cetyltrimethylammonium bromide, chitosans and lauryldimethylbenzylammonium chloride.  
   
   
       16 . The composition according to  claim 12 , wherein the surface active biological modifiers are selected from the group consisting of: albumin, casein, heparin, hirudin, or other proteins.  
   
   
       17 . The composition according to  claim 11 , wherein the pH adjusting agent is selected from the group consisting of: buffers, sodium hydroxide, hydrochloric acid, tris, citrate, acetate, lactate, meglumine, amino acids selected from the group consisting of glycine, alanine, leucine, isoleucine, lysine, methionine, tyrosine, phenylalanine, tryptophan, histidine, proline, serine, glutamic acid, aspartic acid, asparagine, glutamine, cysteine, and taurine.  
   
   
       18 . The composition according to  claim 11 , wherein the cryopreservation agent is selected from the group consisting of carbohydrates, glycerol, polyalkoxyethers, PEG-fatty acids and lipids, biologically-based surfactants, and other surface active agents.  
   
   
       19 . The composition according to  claim 18 , wherein the carbohydrate is selected from the group consisting of saccharides, disaccharides, and sugar alcohols.  
   
   
       20 . The composition according to  claim 19 , wherein the disaccharide is sucrose.  
   
   
       21 . The composition according to  claim 19 , wherein the sugar alcohol is mannitol.  
   
   
       22 . The composition according to  claim 18 , wherein the surface active agent is selected from the group consisting of polysorbate (Tweens), glycerol, polyalkoxyethers, PEG-fatty acids, PEG-lipids, albumin, starch, and dimethylsulfoxide.  
   
   
       23 . The composition according to  claim 11 , wherein the viscosity modulating agent is selected from the group consisting of carbohydrates, polymers, and proteins.  
   
   
       24 . The composition according to  claim 11 , wherein the excipient is present in an amount of from about 0.001% to about 20% based on the total weight of the composition.  
   
   
       25 . The composition according to  claim 11 , wherein the excipient is present in an amount of from about 0.01% to about 5% based on the total weight of the composition.  
   
   
       26 . The composition according to  claim 1 , wherein the suspension is stable for at least 6 months.  
   
   
       27 . A method for stabilizing a suspension of a poorly water soluble compound in an aqueous matrix comprising the steps of: providing a suspension of a crystalline phase pharmaceutical agent or an amorphous phase pharmaceutical agent in an aqueous matrix, wherein the compound has a solubility in water of less than 10.0 mg/ml, and wherein about over 99% of the particles have a particle size of less than about 5 microns; and freezing the aqueous suspension.  
   
   
       28 . (canceled)  
   
   
       29 . (canceled)  
   
   
       30 . The method according to  claim 27 , wherein the pharmaceutical agent is selected from the group consisting of: therapeutic agents and diagnostic agents.  
   
   
       31 . The method according to  claim 30 , wherein the therapeutic agent is selected from the group consisting of antifungals, analgesics, anti-inflammatory agents, anthelmintics, anti-arrhythmic agents, antibiotics, anticoagulants, antidepressants, antidiabetic agents, antiepileptics, antihistamines, antihypertensive agents, antimuscarinic agents, antiprotozoal agents, antimycobacterial agents, antineoplastic agents, immunosuppressants, immunostimulants, antithyroid agents, antiviral agents, anxiolytic sedatives, astringents, beta-adrenoceptor blocking agents, contrast media, corticosteroids, cough suppressants, diagnostic agents, diagnostic imaging agents, diuretics, dopaminergics, haemostatics, immunological agents, lipid regulating agents, muscle relaxants, parasympathomimetics, parathyroid calcitonin, prostaglandins, radio-pharmaceuticals, sex hormones, anti-allergic agents, stimulants, sympathomimetics, thyroid agents, vasodilators vaccines, and xanthines.  
   
   
       32 . (canceled)  
   
   
       33 . The method according to  claim 27 , wherein the pharmaceutical agent is present in an amount of from about 0.01 to about 50% by weight based on the total weight of the composition.  
   
   
       34 . The method according to  claim 27 , wherein the particle size of the pharmaceutical agent is about 50 nm to 50 microns.  
   
   
       35 . The method according to  claim 27 , wherein the mean diameter of the particles of the pharmaceutical agent is about 50 nm to 2 microns.  
   
   
       36 . (canceled)  
   
   
       37 . The method according to  claim 27 , further comprising the step of sterilizing by filter sterilization before freezing.  
   
   
       38 . The method according to  claim 27 , further comprising the step of sterilizing by heat sterilization before freezing.  
   
   
       39 . The method according to  claim 27 , further comprising the step of sterilization by gamma-irradiation.  
   
   
       40 . The method according to  claim 27 , wherein the step of providing the suspension is a method selected from the group consisting of: precipitating the pharmaceutical agent in an aqueous medium to derive a pre-suspension; and suspending the pharmaceutical agent in an aqueous medium to derive a pre-suspension.  
   
   
       41 . The method according to  claim 40 , wherein the step of precipitating is selected from the group consisting of: microprecipitation, emulsion evaporation, solvent anti-solvent precipitation, supercritical fluid precipitation, temperature shift precipitation, pH shift precipitation, and seeding.  
   
   
       42 . The method according to  claim 40 , wherein the step of suspending comprises the steps of adding the pharmaceutical agent to the aqueous medium.  
   
   
       43 . The method according to  claim 42 , further comprising the step of adding energy to the pharmaceutical agent or to the pre-suspension.  
   
   
       44 . The method according to  claim 43 , wherein the step of adding energy to the pharmaceutical agent comprises performing a method selected from the group consisting of sonication, homogenization, microfluidization, countercurrent homogenization, and methods of providing impact, shear or cavitation forces, or thermal energy input, either in a continuous fashion, or by temperature variation.  
   
   
       45 . The method according to  claim 43 , wherein the pharmaceutical agent has particles of a first average particle size prior to the energy-addition step and a second average particle size after the energy-addition step wherein the second average particle size is less than the first average particle size.  
   
   
       46 . The method according to  claim 40 , wherein the pre-suspension further comprising one or more excipients selected from the group consisting of: surface modifiers, pH adjusting agents, crystal growth modifiers, cryopreservation agents, osmotic agents, co-solvents and viscosity modulating agents.  
   
   
       47 . The method according to  claim 46 , wherein the surface modifier is selected from the group consisting of: anionic surfactants, cationic surfactants, nonionic surfactants and surface active biological modifiers.  
   
   
       48 . The method according to  claim 45 , wherein the nonionic surfactant is selected from the group consisting of: polyoxyethylene fatty alcohol ethers, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene-derivatized lipids such as mPEG-PSPC (palmitoyl stearoyl-phophatidylcholine), mPEG-PSPE (palmitoyl-stearoyl-phophatidylethanolamine), sorbitan esters, glycerol monostearate, polyethylene glycols, polypropylene glycols, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, aryl alkyl polyether alcohols, polyoxyethylene-polyoxypropylene copolymers, polaxamines, methylcellulose, hydroxycellulose, hydroxy propylcellulose, hydroxy propylmethylcellulose, noncrystalline cellulose, polysaccharides, starch, starch derivatives, hydroxyethylstarch, polyvinyl alcohol, and polyvinylpyrrolidone.  
   
   
       49 . The method according to  claim 47 , wherein the anionic surfactant is selected from the group consisting of potassium laurate, triethanolamine stearate, sodium lauryl sulfate, sodium dodecylsulfate, alkyl polyoxyethylene sulfates, sodium alginate, dioctyl sodium sulfosuccinate, glyceryl esters, sodium carboxymethylcellulose, bile acids and their salts, cholic acid, deoxycholic acid, glycocholic acid, taurocholic acid, glycodeoxycholic acid, and calcium carboxymethylcellulose.  
   
   
       50 . The method according to  claim 47 , wherein the cationic surfactant is selected from the group consisting of quaternary ammonium compounds, benzalkonium chloride, cetyltrimethylammonium bromide, chitosans and lauryldimethylbenzylammonium chloride.  
   
   
       51 . The method of  claim 47 , wherein the surface active biological modifiers are selected from the group consisting of: albumin, casein, heparin, hirudin, or other proteins.  
   
   
       52 . The method according to  claim 46 , wherein the pH adjusting agent is selected from the group consisting of: sodium hydroxide, buffers, hydrochloric acid, tris, citrate, acetate, lactate, meglumineand amino acids selected from the group glycine, alanine, leucine, isoleucine, lysine, methionine, tyrosine, phenylalanine, tryptophan, histidine, proline, serine, glutamic acid, aspartic acid, asparagine, glutamine, cysteine, and taurine.  
   
   
       53 . The method according to  claim 46 , wherein the cryopreservation agent is selected from the group consisting of carbohydrates, glycerol, polyalkoxyethers, PEG-fatty acids and lipids, biologically-based surfactants, and other surface active agents.  
   
   
       54 . The method according to  claim 53 , wherein the carbohydrate is selected from the group consisting of saccharides, disaccharides, and sugar alcohols.  
   
   
       55 . The method according to  claim 54 , wherein the disaccharide is sucrose.  
   
   
       56 . The method according to  claim 54 , wherein the sugar alcohol is mannitol.  
   
   
       57 . The method according to  claim 53 , wherein the surface active agent is selected from the group consisting of polysorbates (Tweens), glycerol, polyalkoxyethers, PEG-fatty acids, PEG-lipids, albumin, starch, and dimethylsulfoxide.  
   
   
       58 . The method according to  claim 46 , wherein the viscosity-modulating agent is selected from the group consisting of carbohydrates, polymers, and proteins.  
   
   
       59 . The method according to  claim 46 , wherein the excipient is present in an amount of about 0.001% to about 20% based on the total weight of the pre-suspension.  
   
   
       60 . The method according to  claim 46 , wherein the excipient is present in an amount of about 0.01% to about 5% based on the total weight of the pre-suspension.  
   
   
       61 . The method according to  claim 43 , wherein the step of adding energy to the pre-suspension comprises the step of performing a method selected from the group consisting of sonication, homogenization, microfluidization, countercurrent homogenization, and methods of providing impact, shear or cavitation forces, or thermal energy input, either in a continuous fashion, or by temperature variation.  
   
   
       62 . The method according to  claim 41 , wherein the emulsion evaporation method comprises the steps of: dissolving the pharmaceutical agent in a volatile water immiscible solvent to form a solution; combining the solution with an aqueous medium to form an emulsion; mixing the emulsion to form a microemulsion; and removing the volatile water immiscible solvent in the microemulsion to form an aqueous suspension.  
   
   
       63 . The method according to  claim 62 , wherein the aqueous suspension further comprising one or more excipients selected from the group consisting of surface modifiers, pH adjusting agents, crystal growth modifiers, cryopreservation agents, osmotic agents, co-solvents, and viscosity modulating agent.  
   
   
       64 . The method according to  claim 63 , wherein the surface modifier is selected from the group consisting of: anionic surfactants, cationic surfactants, nonionic surfactants and surface active biological modifiers.  
   
   
       65 . The method according to  claim 64 , wherein the nonionic surfactant is selected from the group consisting of: polyoxyethylene fatty alcohol ethers, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene-derivatized lipids such as mPEG-PSPC (palmitoyl-stearoyl-phophatidylcholine), mPEG-PSPE (palmitoyl-stearoyl-phophatidylethanolamine), sorbitan esters, glycerol monostearate, polyethylene glycols, polypropylene glycols, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, aryl alkyl polyether alcohols, polyoxyethylene-polyoxypropylene copolymers, polaxamines, methylcellulose, hydroxycellulose, hydroxy propylcellulose, hydroxy propylmethylcellulose, noncrystalline cellulose, polysaccharides, starch, starch derivatives, hydroxyethylstarch, polyvinyl alcohol, and polyvinylpyrrolidone.  
   
   
       66 . The method according to  claim 64 , wherein the anionic surfactant is selected from the group consisting of: potassium laurate, triethanolamine stearate, sodium lauryl sulfate, sodium dodecylsulfate, alkyl polyoxyethylene sulfates, sodium alginate, dioctyl sodium sulfosuccinate, glyceryl esters, sodium carboxymethylcellulose, bile acids and their salts, cholic acid, deoxycholic acid, glycocholic acid, taurocholic acid, glycodeoxycholic acid, and calcium carboxymethylcellulose.  
   
   
       67 . The method according to  claim 64 , wherein the cationic surfactant is selected from the group consisting of quaternary ammonium compounds, benzalkonium chloride, cetyltrimethylammonium bromide, chitosans and lauryldimethylbenzylammonium chloride.  
   
   
       68 . The method according to  claim 64 , wherein the surface active biological modifiers are selected from the group consisting of: albumin, casein, heparin, hirudin, or other proteins.  
   
   
       69 . The method according to  claim 63 , wherein the pH adjusting agent is selected from the group consisting of: buffers, sodium hydroxide, hydrochloric acid, tris, citrate, acetate, lactate, meglumine and amino acids selected from the group consisting of glycine, alanine, leucine, isoleucine, lysine, methionine, tyrosine, phenylalanine, tryptophan, histidine, proline, serine, glutamic acid, aspartic acid, asparagine, glutamine, cysteine, and taurine.  
   
   
       70 . The method according to  claim 63 , wherein the cyropreservation agent is selected from the group consisting of carbohydrates, glycerol, polyalkoxyethers, PEG-fatty acids and lipids, biologically-based surfactants, and other surface active agents.  
   
   
       71 . The method according to  claim 70 , wherein the carbohydrate is selected from the group consisting of saccharides, disaccharides, and sugar alcohols.  
   
   
       72 . The method according to  claim 71 , wherein the disaccharide is sucrose.  
   
   
       73 . The method according to  claim 71 , wherein the sugar alcohol is mannitol.  
   
   
       74 . The method according to  claim 70 , wherein the surface active agent is selected from the group consisting of polysorbates (Tweens), polyalkoxyethers, PEG-fatty acids, PEG-lipids, albumin, starch, glycerol, and dimethylsulfoxide.  
   
   
       75 . The method according to  claim 63 , wherein the modulating agent is selected from the group consisting of carbohydrates, polymers, and proteins.  
   
   
       76 . The method according to  claim 63 , wherein the excipient is present in an amount of about 0.001% to about 20% based on the total weight of the suspension.  
   
   
       77 . The method according to  claim 63 , wherein the excipient is present in an amount of about 0.01% to about 5% based on the total weight of the suspension.  
   
   
       78 . The method according to  claim 62 , wherein the volatile water immiscible solvent is selected from the group consisting of: linear, branched or cyclic alkanes with carbon number of 5 or higher, linear, branched or cyclic alkenes with carbon number of 5 or higher, linear, branched or cyclic alkynes with carbon number of 5 or higher; aromatic hydrocarbons completely or partially halogenated hydrocarbons, ethers, esters, ketones, mono-, di- or tri-glycerides, native oils, alcohols, aldehydes, acids, amines, linear or cyclic silicones, hexamethyldisiloxane, or any combination of these solvents.  
   
   
       79 . The method according to  claim 62 , wherein the volatile water immiscible solvent is methylene chloride.  
   
   
       80 . The method according to  claim 62 , further comprises of the step of cooling the emulsion to about 4° C.  
   
   
       81 . The method according to  claim 62 , wherein the step of mixing comprises the step of adding energy by a method selected form the group consisting of sonication, homogenization, microfluidization, counter current homogenization, and methods of providing impact, shear or cavitation forces, thermal input, either continuously or by temperature variation.  
   
   
       82 . The method according to  claim 62 , wherein the step of removing the volatile water immiscible solvent is by sonicating.  
   
   
       83 . The method according to  claim 62 , wherein the step of removing the volatile water immiscible solvent is by placing the microemulsion under a high vacuum.  
   
   
       84 . The method according to  claim 62 , wherein the particles of the pharmaceutical agent are generally spherical in shape.  
   
   
       85 . The method according to  claim 39 , wherein the solvent anti-solvent method comprises the steps of: dissolving the pharmaceutical agent in a water miscible solvent to form a non-aqueous solution; and combining the non-aqueous solution with an aqueous medium to precipitate the pharmaceutical agent to derive a pre-suspension.  
   
   
       86 . The method according to  claim 85 , further comprising the step of agitating the pre-suspension to form a suspension.  
   
   
       87 . The method according to  claim 86 , wherein the step of agitating comprises the step of adding energy to the pre-suspension.  
   
   
       88 . The method according to  claim 87 , wherein the energy-addition step comprises the step of importing energy to the pre-suspension using a method selected from the group consisting of sonication, homogenization, microfluidization, counter current homogenization, and methods of providing impact, shear or cavitation forces, or input of thermal energy, either continuously or by temperature variation.  
   
   
       89 . The method according to  claim 85 , wherein the aqueous suspension further comprising one or more excipients selected from the group consisting of surface modifiers, pH adjusting agents, crystal growth modifiers, cryopreservation agents, osmotic agents, co-solvents, and viscosity modulating agent.  
   
   
       90 . The method according to  claim 89 , wherein the surface modifier is selected from the group consisting of: anionic surfactants, cationic surfactants, nonionic surfactants and surface active biological modifiers.  
   
   
       91 . The method according to  claim 84 , wherein the nonionic surfactant is selected from the group consisting of: polyoxyethylene fatty alcohol ethers, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene-derivatized lipids such as mPEG-PSPC (palmitoyl-stearoyl-phophatidylcholine), mPEG-PSPE (palmitoyl-stearoyl-phophatidylethanolamine), sorbitan esters, glycerol monostearate, polyethylene glycols, polypropylene glycols, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, aryl alkyl polyether alcohols, polyoxyethylene-polyoxypropylene copolymers, polaxamines, methylcellulose, hydroxycellulose, hydroxy propylcellulose, hydroxy propylmethylcellulose, noncrystalline cellulose, polysaccharides, starch, starch derivatives, hydroxyethylstarch, polyvinyl alcohol, and polyvinylpyrrolidone.  
   
   
       92 . The method according to  claim 90 , wherein the anionic surfactant is selected from the group consisting of: potassium laurate, triethanolamine stearate, sodium lauryl sulfate, sodium dodecylsulfate, alkyl polyoxyethylene sulfates, sodium alginate, dioctyl sodium sulfosuccinate, glyceryl esters, sodium carboxymethylcellulose, bile acids and their salts, cholic acid, deoxycholic acid, glycocholic acid, taurocholic acid, glycodeoxycholic acid, and calcium carboxymethylcellulose.  
   
   
       93 . The method according to  claim 90 , wherein the cationic surfactant is selected from the group consisting of quaternary ammonium compounds, benzalkonium chloride, cetyltrimethylammonium bromide, chitosans and lauryldimethylbenzylammonium chloride.  
   
   
       94 . The method according to  claim 90 , wherein the surface active biological modifiers are selected from the group consisting of: albumin, casein, heparin, hirudin, or other proteins.  
   
   
       95 . The method according to  claim 89 , wherein the pH adjusting agent is selected from the group consisting of: buffers, sodium hydroxide, hydrochloric acid, tris, citrate, acetate, lactate, meglumine and amino acids selected from the group consisting of glycine, alanine, leucine, isoleucine, lysine, methionine, tyrosine, phenylalanine, tryptophan, histidine, proline, serine, glutamic acid, aspartic acid, asparagine, glutamine, cysteine, and taurine.  
   
   
       96 . The method according to  claim 89 , wherein the cyropreservation agent is selected from the group consisting of carbohydrates, glycerol, polyalkoxyethers, PEG-fatty acids and lipids, and biologically-based surfactants.  
   
   
       97 . The method according to  claim 96 , wherein the carbohydrate is selected from the group consisting of saccharides, disaccharides, and sugar alcohols.  
   
   
       98 . The method according to  claim 97 , wherein the disaccharide is sucrose.  
   
   
       99 . The method according to  claim 97 , wherein the sugar alcohol is mannitol.  
   
   
       100 . The method according to  claim 96 , wherein the surface active agent is selected from the group consisting of polysorbates (Tweens), polyalkoxyethers, PEG-fatty acids, PEG-lipids, albumin, starch, glycerol, and dimethylsulfoxide.  
   
   
       101 . The method according to  claim 88 , wherein the viscosity modulating agent is selected from the group consisting of carbohydrates, polymers, and proteins.  
   
   
       102 . The method according to  claim 88 , wherein the excipient is present in an amount of about 0.001% to about 20% based on the weight of the pre-suspension.  
   
   
       103 . The method according to  claim 88 , wherein the excipient is present is an amount of about 0.01% to about 5% based on the weight of the pre-suspension.  
   
   
       104 . (canceled)