CHANG CHIN-MING (TW)
US20130217657A1 | 2013-08-22 | |||
US20130217657A1 | 2013-08-22 |
"Ansel's Pharmaceutical Dosage Forms and Drug Delivery Systems", 23 December 2013, article ALLEN LOYD ET AL: "Section VII. Sterile Dosage Forms and Delivery Systems, 17 Special Solutions and Suspensions", pages: 616 - 616, XP055929136
Claims 1. An aqueous liquid composition for ophthalmic administration, comprising therapeutically effective amounts of a ketorolac compound and of a corticosteroid, wherein the ketorolac compound is present in an essentially dissolved form; wherein the corticosteroid is present in the form of suspended particles; wherein the composition exhibits an acidic pH of about 6.5 or less; and wherein the viscosity of the aqueous liquid composition is in the range from about 1 to about 60 centipoise (cps) or millipascal-second (mPa·s). 2. The composition of claim 1, wherein the corticosteroid is selected from dexamethasone, prednisolone, fluorometholone, betamethasone, difluprednate, triamcinolone, remexolone, loteprednol, and clobetasol, or any salt, ester, acetonide or other hydrolysable prodrug thereof. 3. The composition of any one of the preceding claims, being essentially free of a buffer system, wherein essentially free refers to the composition comprising less than a functional amount of the buffer system, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the buffer system. 4. The composition of any one of the preceding claims, being essentially free of sodium chloride, wherein essentially free refers to the composition comprising less than a functional amount of the sodium chloride, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the sodium chloride. 5. The composition of any one of the preceding claims, having a pH of about 5-6. 6. The composition of any one of the preceding claims, further characterised in that it exhibits a surface tension in the range from about 20 to 70 dyne per centimeter (dyn/cm) or about 0.020 to 0.070 newton per meter (N/m), and/or a zeta potential in the range from about +/-10 to +/-40 millivolt (mV). 7. The composition of any one of the preceding claims, wherein the ketorolac compound is ketorolac tromethamine. 8. The composition of claim 7, wherein the concentration of ketorolac tromethamine in the composition is from about 0.2 wt.% to about 1.0 wt.%, and preferably from about 0.3 wt.% to about 0.6 wt.%. 9. The composition of any one of the preceding claims, wherein the corticosteroid is a loteprednol compound, and preferably loteprednol etabonate. 10. The composition of claim 9, wherein the concentration of loteprednol etabonate in the composition is from about 0.1 wt.% to about 1.2 wt.%, and preferably about 0.5 wt.% or about 1.0 wt.%. 11. The composition of any one of the preceding claims, further comprising: (a) a polymeric viscosity-enhancing agent; (b) a non-ionic surfactant; and/or (c) a low-molecular weight polyol; wherein the low-molecular weight polyol refers to an organic compound comprising more than one hydroxyl (-OH) group and having a molecular weight from about 45 g / mol to about 450 g / mol. 12. The composition of claim 11, wherein the polymeric viscosity-enhancing agent is a non-ionic, water-soluble polymer, and preferably selected from hydroxypropyl cellulose (HPC), hydroxypropyl methylcellulose (HPMC), and polyvinylpyrrolidone (PVP). 13. The composition of any one of claims 11 to 12, wherein the polymeric viscosity-enhancing agent is polyvinylpyrrolidone. 14. The composition of any one of claims 12 to 13, wherein the weight ratio of the ketorolac tromethamine to the polyvinylpyrrolidone is from about 1:10 to about 5:1, and preferably from about 1:3 to about 2:1. 15. The composition of claim 11, wherein the non-ionic surfactant is tyloxapol; and wherein the concentration of tyloxapol in the composition is from about 0.1 wt.% to about 1.2 wt.%, and preferably from greater than about 0.2 wt.% to less than about 1.0 wt.%. 16. The composition of claim 11, wherein the low-molecular weight polyol is glycerol; and wherein the concentration of glycerol in the composition is from about 0.5 wt.% to about 2.5 wt.%. 17. The composition of any one of claims 11 to 16, comprising a further polymeric viscosity-enhancing agent, said further polymeric viscosity-enhancing agent being selected from anionic carbohydrates, preferably hyaluronic acid, gellan gum, or carboxymethyl cellulose, including any salts thereof. 18. The composition of claim 17, wherein the anionic carbohydrate is at least partially neutralised carboxymethyl cellulose. 19. The composition of any one of claims 17 to 18, wherein the carboxymethyl cellulose is sodium carboxymethyl cellulose, and wherein the weight ratio of the sodium carboxymethyl cellulose to the polyvinylpyrrolidone is from about 1:10 to about 5:1, and preferably from about 1:2 to about 2:1. 20. The composition of any one of the preceding claims, being essentially free of poloxamer, wherein essentially free refers to the composition comprising less than a functional amount of the poloxamer, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the poloxamer. 21. The composition of any one of claims 7 to 20, further comprising a cyclodextrin, preferably 2-hydroxypropyl-β-cyclodextrin or sulfobutylether-β- cyclodextrin; and wherein the molar ratio of the cyclodextrin to the ketorolac tromethamine is from about 1:85 to about 6:1, and preferably from about 1:25 to about 1:2. 22. The composition of any one of the preceding claims, further comprising ethylenediaminetetraacetic acid (EDTA), preferably at a concentration of about 0.1 wt.% or lower. 23. The composition of any one of the preceding claims, further comprising a preservative. 24. The composition of any one of claims 22 to 23, wherein the carboxymethyl cellulose is sodium carboxymethyl cellulose, and wherein the composition consists essentially of (a) ketorolac tromethamine, preferably about 0.3 wt.% to about 0.6 wt.%; (b) a corticosteroid; (c) tyloxapol, preferably about 0.2 wt.% to about 1 wt.%; (d) polyvinylpyrrolidone, preferably about 0.4 wt.% to about 0.8 wt.%; (e) sodium carboxymethyl cellulose, preferably about 0.4 wt.% to about 0.8 wt.%; (f) glycerol, preferably about 0.5 wt.% to about 2.5 wt.%; (g) EDTA, preferably about 0.01 wt.% to about 0.1 wt.%; (h) benzalkonium chloride, preferably about 0.005 wt.% to about 0.02 wt.%; (i) water; and optionally (k) 2-hydroxypropyl-β-cyclodextrin, preferably about 0.1 wt.% to about 0.8 wt.%, and/or an acid or base to adjust the pH, wherein the pH of the composition is about 5-6. 25. The composition of any one of the preceding claims, wherein the suspended particles have a D90 of about less than 20 µm. 26. The composition of any one of the preceding claims, wherein the suspended particles have a D90 of about less than 3 µm. 27. The composition of any one of the preceding claims, wherein the suspended particles have a D50 of about less than 1 µm. 28. The composition of any one of the preceding claims, being essentially free of a cross-linked, carboxy containing polymer, wherein essentially free refers to the composition comprising less than a functional amount of the cross-linked, carboxy containing polymer, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the cross- linked, carboxy containing polymer. 29. The composition of any one of the preceding claims, being essentially free of chitosan, wherein essentially free refers to the composition comprising less than a functional amount of the chitosan, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the chitosan. 30. The composition of any one of the preceding claims, for use in the prevention or treatment of ocular inflammation. 31. The composition for use of claim 30, wherein the ocular inflammation is associated with, or occurring subsequent to, cataract surgery. 32. The composition for use of claim 30, wherein the ocular inflammation is associated with seasonal allergic conjunctivitis. 33. The composition for use of any one of claims 30 to 32, wherein the use involves ophthalmic administration of the composition once a day, twice daily, or three times daily. 34. A method for preventing or treating ocular inflammation in a subject, said method comprising topically administering the composition of any one of claims 1 to 33 to an eye of said subject. 35. The method of claim 34, wherein the subject has undergone cataract surgery. 36. The method of claim 34, wherein the ocular inflammation is associated with seasonal allergic conjunctivitis. 37. The method of claim 34, wherein the administering occurs once a day, twice daily, or three times daily. 38. The use of the compositions of any one of claims 1 to 29 for the manufacture of a medicament for the prevention or treatment of ocular inflammation. 39. The use of claim 38, wherein the ocular inflammation is associated with, or occurring subsequent to, cataract surgery. 40. The use of claim 38, wherein the ocular inflammation is associated with seasonal allergic conjunctivitis. 41. The use of any one of claims 38 to 40, wherein the use involves ophthalmic administration of the composition once a day, twice daily, or three times daily. |
Table1.ScreeningExperiments,CompositionsF2–F5 Ingredient,^wt.%^ F2.1^ F2.2^ F3.1^ F3.2^ F4.1^ F4.2^ F5.1^ F5.2^ Table2.ScreeningExperiments,CompositionsF7–F10 Ingredient,^wt.^%^ F7.1^ F7.2^ F8.1^ F8.2^ F9.1^ F9.2^ F10.1^ F10.2^ The carbomer containing formulations (F2, F4, F7, and F9) formed high viscous gels which cannot be resuspended to produce a homogeneous composition. Therefore, carbomer-containing compositions were not further pursued. Compositions F2 and F3 comprising a mixture of tyloxapol at 0.1 wt.% and poloxamer at 0.6 wt.% were physically unstable as evidenced from an increase in the particle size over time. Therefore, these compositions were not selected for further evaluation. Composition F5 comprising a mixture of tyloxapol at 0.3 wt.% and poloxamer at 0.6 wt.% as surfactant and sodium carboxymethyl cellulose (NaCMC or sodium CMC) as the viscosity agent showed significant decrease of loteprednol and ketorolac assay values over time. Therefore, these compositions were not selected for further evaluation. Compositions F8 and F10 comprising tyloxapol without the presence of poloxamer, and mixture of povidone and NaCMC as viscosity agent achieved desired physical and chemical stability, re-suspendability, and low viscosity. These compositions were further evaluated for optimization. Example^2:^Preparation^of^Exemplary^Compositions^^ Based on the screening experiments of Example 1, compositions comprising a loteprednol compound, a ketorolac compound, tyloxapol, povidone, sodium carboxymethyl cellulose, and additional components were further optimized and evaluated. A milling aid solution was prepared by dissolving povidone, tyloxapol, glycerol, and EDTA in purified water and filtering the solution using a 0.2 µm filter. Loteprednol etabonate powder was then dispersed into the milling aid solution using high shear mixing with an ULTRA-TURRAX. The loteprednol etabonate dispersion was transferred into a milling chamber (Dyno-Mill) which was then filled with beads (zirconium oxide beads). The suspension slurry was milled for a specific duration and discharged from the chamber. To ensure complete transfer from the milling chamber, the suspension slurry was diluted with a washing medium during transfer. The mixture of the milled suspension slurry, beads, and washing medium was collected and filtered using a dialysis membrane and vacuum pump. Additional washing medium was used for washing milling beads during the filtration process. The suspension slurry is typically irradiation sterilized before further mixing with the rest of the formulation ingredients. For micron size formulations, a milling step may not be necessary. Ketorolac tromethamine was dissolved in the milling aid solution to prepare a ketorolac tromethamine stock solution. Sodium carboxymethyl cellulose was dissolved in the milling aid solution to prepare a sodium carboxymethyl cellulose stock solution. Benzalkonium chloride may be added in the ketorolac tromethamine stock solution. The sodium carboxymethyl cellulose stock solution and ketorolac tromethamine stock solution were filtered through 0.2 µm filter and then mixed with the loteprednol etabonate suspension slurry until homogeneous. The pH was adjusted with 0.1 M HCl / 0.1 M NaOH. Specific exemplary compositions prepared as described above in Example 2 are summarized below in Table 3. Example 3: Preparation of Exemplary Compositions with Cyclodextrin Exemplary compositions further comprising cyclodextrin were prepared as in Example 2 above, with the addition of cyclodextrin as an additional component in the milling aid composition. Alternatively, cyclodextrin was added as a powder to the loteprednol etabonate suspension slurry after milling. Specific exemplary compositions prepared as described above in Example 3 are summarized below in Table 4.
Table3.FormulationCompositionsforPanelIStabilityStudy Formulation T able4.FormulationCompositionsforPanel IIStabilityStudy Formulation Example 4: Stability Studies of Exemplary Compositions The stability of the exemplary compositions was investigated using gradient high performance liquid chromatography analysis at different storage time points of 1 month, 3 months, 6 months, 9 months, and 11 months. The amount of each active ingredient and related degradation substances, pH, osmolality, particle size distribution, and viscosity were measured for each composition at each time point. Ketorolac tromethamine (KT) exhibited stability in all compositions. The d egradation of loteprednol etabonate (LE) showed a pH dependency, thus pH was optimized for loteprednol etabonate stability. The results of the Panel I stability studies for the compositions shown in Table 3 are summarized in Table 5. The suspension slurry was not irradiation sterilized in the preparation of Panel 1 formulations. In Tables 5 and 6, below, the term “RS” refers to “related substance”; “LOQ” refers to “Limit of Quantification; “RRT” refers to “relative retention time”; and LR refers to “loteprednol etabonate related”. Table5.PanelIFormulationStabilityDataat25°Cfor11months 25^°C^/^60^%^RH^ t ^
LR 2: 2.54 2 3
D10^ 0.07 0.07 0.08 0.07 0.07 2 5 Re‐dispersibility, 10 10 20 20 10 D egradation of loteprednol occurred in the formulation as expected within an acceptable level. Minimal degradation of ketorolac was achieved in this formulation and all other test parameters such as pH, osmolality, viscosity and particle size also remained stable throughout the stability study. T he results of the Panel II stability studies at the accelerated condition (40 °C) for the compositions shown in Table 4 are summarized in Table 6. The suspension slurry of Panel 2 formulations F7, F8, and F9 were irradiation sterilized. Table6.PanelIIFormulationStabilityDataat40°Cfor1month D ^ 007 007 S imilar to the results from the Panel 1 study, degradation of loteprednol occurred in the formulation as expected. Minimal degradation of ketorolac was a chieved in this formulation and all other test parameters such as pH, osmolality, viscosity, surface tension, zeta potential, and particle size remained stable throughout the stability study.
Example 5: Investigation of Chitosan as Additive Chitosan was investigated as an additive in an exemplary embodiment of the compositions disclosed herein. The composition of this example included the following components. Table7.Componentsof ChitosanContainingComposition I ngredients, w/v % EY-05 BTV300 C19 G iven that chitosan is positively charged, and ketorolac compounds, NaCMC, and NaEDTA are negatively charged in aqueous solutions, it was hypothesized that chitosan may form insoluble precipitates with one or more of these components due to formation of insoluble salt complexes. In this exemplary embodiment, loteprednol etabonate was excluded to assure the visibility of potential precipitates formed during the preparations. T wo distinct approaches were investigated. In a first experiment, a solution of fully dissolved chitosan was added to a clear, colorless solution of NaCMC and NaEDTA, resulting in formation of white flocculant precipitate; and a solution having a pH of 4.1. Chitosan is fully soluble at pH 4, suggesting an incompatibility of chitosan with NaCMC and/or NaEDTA. In a second experiment, a solution of fully dissolved chitosan was added to a clear, colorless solution of glycerine, tyloxapol, PVP, HP-b- cyclodextrin, and ketorolac tromethamine having a pH 5.1. Upon addition of the two solutions, white flocculates formed immediately with a resulting solution of pH 3.8. When the pH 3.8 solution containing the white flocculates is pH adjusted to the final formulation of pH 5.5, the white flocculates persist. If the preparation is repeated excluding ketorolac tromethamine, no precipitates form. Moreover, chitosan is fully soluble at pH 3.8. Therefore, the observed white precipitates are a chitosan / ketorolac tromethamine insoluble complex. Precipitate formation would reduce the bioavailability of ketorolac and accuracy of ketorolac dosing, highlighting the incompatibility of chitosan in such compositions. Example 6: Comparative Studies with Chitosan Containing GelCompositions Chitosan containing compositions of ketorolac tromethamine and loteprednol etabonate were prepared using the methods disclosed in US2013/0217657A1, specifically compositions 7 and 8 of Table 6. The compositions included the following components: Table8.Componentsof ComparativeCompositions 7and8 I ngredients, w/v % Composition 7 Composition 8 Compositions 7 and 8 were prepared by combining polycarbophil, sodium chloride, and sodium edetate in water and stirring for 0.5 hours. The composition was autoclaved at 121 °C for 45 minutes and cooled to room temperature to produce a white opaque suspension. An aqueous solution of chitosan was prepared using hydrochloric acid and added into the polycarbophil suspension to produce a free flowing, white opaque suspension. Mannitol, Poloxamer 407, and ketorolac tromethamine were dissolved in water to form a clear colorless solution, and loteprednol etabonate was added to the solution by dry particle addition to form a white suspension. The mannitol, poloxamer 407, ketorolac tromethamine, and loteprednol etabonate suspension was added to the polycarbophil, sodium chloride, sodium edetate, chitosan suspension and the pH adjusted to 6.8 to form the final formulation. The final formulation was a white, smooth gel with a viscosity of 7921 mPa·s or cps as measured by Brookfield viscometer. Since loteprednol etabonate was present as a solid dispersion in compositions 7 and 8, it was not possible to visually observe if chitosan and ketorolac tromethamine formed insoluble precipitates as was observed in Example 5, above. In order to investigate the hypothesis, compositions 7 and 8 were prepared as described above, but excluding loteprednol etabonate. In a first experiment, chitosan was added to a clear, colorless solution of mannitol and poloxamer 407. In a second experiment, chitosan was added to a clear, colorless solution of mannitol, poloxamer 407, and ketorolac tromethamine. Upon addition of chitosan to the clear, colorless solution of mannitol and poloxamer 407, a clear colorless solution of pH 3.9 formed. In contrast, when chitosan was added to clear, colorless solutions of mannitol, poloxamer 407, and ketorolac tromethamine, white suspensions of pH 4.7 (composition 7, high ketorolac concentration) and pH 4.6 (composition 8, low ketorolac concentration) formed. The compositions 7 and 8 were then pH adjusted to 6.8 to form the final formulation. Both compositions contain white flocculates deriving from the chitosan / ketorolac salt complex. Therefore, both compositions 7 and 8 do not comprise a ketorolac compound in an essentially dissolved form. ITEM LIST Amongst others, the following list of numbered items are specific embodiments comprised by the present invention: 1. An aqueous liquid composition for ophthalmic administration, comprising therapeutically effective amounts of a ketorolac compound and of a corticosteroid, wherein the ketorolac compound is present in an essentially dissolved form; wherein the corticosteroid is present in the form of suspended particles; wherein the composition exhibits an acidic pH of about 6.5 or less; and wherein the viscosity of the aqueous liquid composition is in the range from about 1 to about 60 centipoise (cps) or millipascal-second (mPa·s). 2. The composition of item 1, wherein the corticosteroid is selected from dexamethasone, prednisolone, fluorometholone, betamethasone, difluprednate, triamcinolone, remexolone, loteprednol, and clobetasol, or any salt, ester, acetonide or other hydrolysable prodrug thereof. 3. The composition of item 1, wherein the corticosteroid is selected from dexamethasone, prednisolone, fluorometholone, betamethasone, difluprednate, triamcinolone, remexolone, loteprednol, and clobetasol, or any salt, ester, or acetonide thereof. 4. The composition of any one of the preceding items, being essentially free of a buffer system, wherein essentially free refers to the composition comprising less than a functional amount of the buffer system, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the buffer system. 5. The composition of any one of the preceding items, being essentially free of sodium chloride, wherein essentially free refers to the composition comprising less than a functional amount of the sodium chloride, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the sodium chloride. 6. The composition of any one of the preceding items, having a pH of about 5-6. 7. The composition of any one of the preceding items, further characterised in that it exhibits a surface tension in the range from about 20 to 70 dyne per centimeter (dyn/cm) or about 0.020 to 0.070 newton per meter (N/m), and/or a zeta potential in the range from about +/-10 to +/-40 millivolt (mV). 8. The composition of any one of the preceding items, wherein the ketorolac compound is ketorolac tromethamine. 9. The composition of item 8, wherein the concentration of ketorolac tromethamine in the composition is from about 0.2 wt.% to about 1.0 wt.%, and preferably from about 0.3 wt.% to about 0.6 wt.%. 10. The composition of any one of the preceding items, wherein the corticosteroid is a loteprednol compound, and preferably loteprednol etabonate. 11. The composition of item 10, wherein the concentration of loteprednol etabonate in the composition is from about 0.1 wt.% to about 1.2 wt.%, and preferably about 0.5 wt.% or about 1.0 wt.%. 12. The composition of any one of the preceding items, further comprising: (a) a polymeric viscosity-enhancing agent; (b) a non-ionic surfactant; and/or (c) a low-molecular weight polyol; wherein the low-molecular weight polyol refers to an organic compound comprising more than one hydroxyl (-OH) group and having a molecular weight from about 45 g / mol to about 450 g / mol. 13. The composition of item 12, wherein the polymeric viscosity-enhancing agent is a non-ionic, water-soluble polymer, and preferably selected from hydroxypropyl cellulose (HPC), hydroxypropyl methylcellulose (HPMC), and polyvinylpyrrolidone (PVP). 14. The composition of any one of items 12 to 13, wherein the polymeric viscosity- enhancing agent is polyvinylpyrrolidone. 15. The composition of any one of items 13 to 14, wherein the weight ratio of the ketorolac tromethamine to the polyvinylpyrrolidone is from about 1:10 to about 5:1, and preferably from about 1:3 to about 2:1. 16. The composition of item 12, wherein the non-ionic surfactant is tyloxapol; and wherein the concentration of tyloxapol in the composition is from about 0.1 wt.% to about 1.2 wt.%, and preferably from greater than about 0.2 wt.% to less than about 1.0 wt.%. 17. The composition of item 12, wherein the low-molecular weight polyol is glycerol; and wherein the concentration of glycerol in the composition is from about 0.5 wt.% to about 2.5 wt.%. 18. The composition of any one of items 12 to 17, comprising a further polymeric v iscosity-enhancing agent, said further polymeric viscosity-enhancing agent being selected from anionic carbohydrates, preferably hyaluronic acid, gellan gum, or carboxymethyl cellulose, including any salts thereof. 19. The composition of item 18, wherein the anionic carbohydrate is at least partially neutralised carboxymethyl cellulose. 20. The composition of any one of items 18 to 19, wherein the carboxymethyl cellulose is sodium carboxymethyl cellulose, and wherein the weight ratio of the sodium carboxymethyl cellulose to the polyvinylpyrrolidone is from about 1:10 to about 5:1, and preferably from about 1:2 to about 2:1. 21. The composition of any one of the preceding items, being essentially free of poloxamer, wherein essentially free refers to the composition comprising less than a functional amount of the poloxamer, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the poloxamer. 22. The composition of any one of items 8 to 21, further comprising a cyclodextrin, preferably 2-hydroxypropyl-β-cyclodextrin or sulfobutylether-β-cyclodextrin; and wherein the molar ratio of the cyclodextrin to the ketorolac tromethamine is from about 1:85 to about 6:1, and preferably from about 1:25 to about 1:2. 23. The composition of any one of the preceding items, further comprising ethylenediaminetetraacetic acid (EDTA), preferably at a concentration of about 0.1 wt.% or lower. 24. The composition of any one of the preceding items, further comprising a preservative. 25. The composition of any one of items 23 to 24, wherein the carboxymethyl cellulose is sodium carboxymethyl cellulose, and wherein the composition consists essentially of (a) ketorolac tromethamine, preferably about 0.3 wt.% to about 0.6 wt.%; (b) a corticosteroid; ( c) tyloxapol, preferably about 0.2 wt.% to about 1 wt.%; (d) polyvinylpyrrolidone, preferably about 0.4 wt.% to about 0.8 wt.%; (e) sodium carboxymethyl cellulose, preferably about 0.4 wt.% to about 0.8 wt.%; (f) glycerol, preferably about 0.5 wt.% to about 2.5 wt.%; (g) EDTA, preferably about 0.01 wt.% to about 0.1 wt.%; (h) benzalkonium chloride, preferably about 0.005 wt.% to about 0.02 wt.%; (i) water; and optionally (k) 2-hydroxypropyl-β-cyclodextrin, preferably about 0.1 wt.% to about 0.8 wt.%, and/or an acid or base to adjust the pH, wherein the pH of the composition is about 5-6. 26. The composition of any one of the preceding items, wherein the suspended particles have a D90 of about less than 20 µm. 27. The composition of any one of the preceding items, wherein the suspended particles have a D90 of about less than 3 µm. 28. The composition of any one of the preceding items, wherein the suspended particles have a D50 of about less than 1 µm. 29. The composition of any one of the preceding items, being essentially free of a cross-linked, carboxy containing polymer, wherein essentially free refers to the composition comprising less than a functional amount of the cross-linked, carboxy containing polymer, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the cross- linked, carboxy containing polymer. 30. The composition of any one of the preceding items, being essentially free of chitosan, wherein essentially free refers to the composition comprising less than a functional amount of the chitosan, typically less than 1 % by weight, preferably less than 0.1 % or even 0.01 %, and including zero percent by weight of the chitosan. 31. The composition of any one of the preceding items, for use in the prevention or treatment of ocular inflammation. 32. The composition for use of item 31, wherein the ocular inflammation is associated with, or occurring subsequent to, cataract surgery. 33. The composition for use of item 31, wherein the ocular inflammation is associated with seasonal allergic conjunctivitis. 34. The composition for use of any one of items 31 to 33, wherein the use involves ophthalmic administration of the composition once a day, twice daily, or three times daily. 35. A method for preventing or treating ocular inflammation in a subject, said method comprising topically administering the composition of any one of items 1 to 34 to an eye of said subject. 36. The method of item 35, wherein the subject has undergone cataract surgery. 37. The method of item 35, wherein the ocular inflammation is associated with seasonal allergic conjunctivitis. 38. The method of item 35, wherein the administering occurs once a day, twice daily, or three times daily. 39. The use of the compositions of any one of items 1 to 30 for the manufacture of a medicament for the prevention or treatment of ocular inflammation. 40. The use of item 39, wherein the ocular inflammation is associated with, or occurring subsequent to, cataract surgery. 41. The use of item 39, wherein the ocular inflammation is associated with seasonal allergic conjunctivitis. 42. The use of any one of items 39 to 41, wherein the use involves ophthalmic administration of the composition once a day, twice daily, or three times daily.