1 . the effects of different carriers on the solubility of dronedarone hydrochloride in the solid dispersion the weight ratio of the drug to the carrier was 1 : 5 . different hydrophilic polymeric carrier materials were selected from the group consisting of polyethylene glycol 6000 , poloxamer 188 , pvp k30 , klucel ® ef , plasdone ® s - 630 , mannitol and combinations thereof respectively . 12 parts by weight of dichloromathane were added into the drug and carrier mixture , and was dissolved by stirring . then the solution was transferred to a vacuum oven , maintained at 55 ° c ., dried under reduced pressure for 48 h . then the dry mass was crushed with a 100 mesh sieve , thereby the solid dispersion of dronedarone was obtained . the solubilities of the solid dispersion in the phosphate buffered saline ( pbs ) at ph6 . 8 were measured as follows . as showed in table 1 and fig1 , when the mass ratio of drug to carrier was same , the solubilities of dronedarone in the solid dispersions prepared with povidone , copovidone and hydroxypropyl cellulose among the various hydrophilic carrier materials were significantly increased , and the addition of surfactant exhibited no significant influence on the solubilities of the solid dispersion of dronedarone . that is , good results can be achieved by using these materials alone , wherein povidone k - 30 exhibited the best effect , followed by hydroxypropyl cellulose ( klucel ® ef ) and copovidone ( plasdone ® s - 630 ). 2 . the effects of different amount and different type of carriers on the solubilities of dronedarone solid dispersions comprising dronedarone hydrochloride were prepared by using povidone , hydroxypropyl cellulose and copovidone as a carrier at different drug : carrier ratios according to the following method : two parts by weight of methylene chloride were added and then the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven , maintained at 55 ° c ., dried under reduced pressure for 48 h . the dried mass was crushed with a 100 mesh sieve and thereby the solid dispersion of dronedarone hydrochloride was obtained . 24 h solubility determination : aliquots of the prepared solid dispersion were added into a 100 ml conical flask respectively . then 50 ml pbs ph6 . 8 were added . the conical flask was sealed and placed in a thermostatic waterbath shaker and shaked at a set temperature of 37 ° c . for 24 h . after 24 hours , 10 ml of the solution were taken and filtrated . the initial 4 ml of the filtrate were abandoned and the subsequent filtrate were taken and diluted with pbs ph6 . 8 to a corresponding folds . the uv absorbance at 290 nm was measured with a uv spectrophotometer . then the drug solubilities were calculated . the 24 h solubility of crystalline dronedarone hydrochloride was 12 . 0 μg / ml . as shown in the results , the solubility of dronedarone hydrochloride in the solid dispersion of present invention in a medium at ph 6 . 8 not only was significantly increased compared with the crystalline dronedarone hydrochloride raw drug , but also was significantly increased compared with those of the dronedarone hydrochlorides in the solid dispersions prepared with polydextrose and copovidone ( 1 : 1 ) of various ratios . a good solubility can be achieved by the solid dispersion of dronedarone which used povidone , hydroxypropyl cellulose and copovidone as a hydrophilic polymeric carrier . in addition , it was found that the solubilities of the solid dispersions prepared within the drug : carrier weight ratio from 1 : 1 . 0 to 1 : 7 . 5 were better , and those from 1 : 1 . 5 to 1 : 5 were the best . several methods were used to prepare the solid dispersions at the dronedarone hydrochloride : povidone ratio of 1 : 1 . 5 ( or 1 : 3 ). 1 part by weight of dronedarone hydrochloride and 3 . 0 parts by weight of povidone pvp k - 30 were weighted and mixed for 10 min in a polyethylene bag , and placed into a feed hopper of the twin - screw hot melting extruder . the parameters of the twin - screw extruder were set as follows : host frequency : 3 . 5 hz ; feed frequency : 3 . 0 hz ; temperature of each district : 140 ° c . after the temperature of each district is stable , the machine was switched on and the liquid fluid flowed from the die was collected and cooled to be solid at room temperature and crushed with a 100 mesh sieve . then the solid dispersion of dronedarone was obtained . 1 part by weight of dronedarone hydrochloride and 3 . 0 parts by weight of povidone pvp k - 30 were weighted , and then 12 parts by weight of dichloromethane were added , and stirred until the solution became clarified . the solution was spray dried and at the same time the inlet and outlet temperatures of the spray drier ( mini spray dryer , b290 , buchi , switzerland ) were maintained at 90 ° c . and 55 ° c . respectively . then the sample was collect and the solid dispersion of dronedarone was obtained . 1 part by weight of dronedarone hydrochloride and 3 . 0 parts by weight of povidone pvp k - 30 were weighted and 12 parts by weight of dichloromethane were added into , and then stirred until the solution became clarified . the solution was transferred to a vacuum oven and maintained at 55 ° c ., then dried under reduced pressure for 48 h and the dry mass was crushed with a 100 mesh sieve and thereby the solid dispersion of dronedarone was obtained . it was found that different preparation methods had no significant influences on the solubility of the drug at the same drug - carrier ratio and all of these solid dispersions had better solubilizing properties . carr index was used to evaluate the compressibility of the powder , and the angle of repose was used to evaluate the fluidity of the powder . a smaller carr index indicated a better compressibility , and a smaller angle of repose indicated a better fluidity . as shown in the results , solubilities of solid dispersions prepared with solvent methods were better than those prepared with hot melting extrusion method . furthermore , the micromeritic properties of the solid dispersions prepared with a drying under reduced pressure are better if a solvent method was used . the powder prepared with a drying under reduced pressure is easier to be prepared into oral solid preparations such as tablets or capsules . the following examples were provided to further illustrate the present invention , but it is not to be construed as being limited thereto . example : the preparation of the solid dispersion of dronedarone hydrochloride ( produced by jiangsu hengrui medicine co ., ltd ). one part by weight of dronedarone hydrochloride and 0 . 5 parts by weight of pvp k - 30 were weighted and three parts by weight of dichloromethane were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 1 . 5 parts by weight of pvp k - 30 were weighted and five parts by weight of dichloromethane were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and three parts by weight of pvp k - 30 were weighted and twelve parts by weight of dichloromethane were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and five parts by weight of pvp k - 30 were weighted and twelve parts by weight of dichloromethane were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 1 . 5 parts by weight of pvp k - 17 were weighted and twelve parts by weight of dichloromethane were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 1 . 5 parts by weight of pvp k - 30 were weighted and five parts by weight of methanol were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 1 . 5 parts by weight of pvp k - 30 were weighted and 12 . 5 parts by weight of anhydrous ethanol were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 1 . 5 parts by weight of pvp k - 25 were weighted and five parts by weight of methanol were added into and the mixture was dissolved by stirring . then the solutions was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 1 . 5 parts by weight of pvp k - 90 were weighted and five parts by weight of methanol were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 1 . 5 parts by weight of klucel ® ef were weighted and five parts by weight of dichloromethane - anhydrous ethanol ( 4 : 1 ) were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 1 . 5 parts by weight of klucel ® lf were weighted and 12 . 5 parts by weight of anhydrous ethanol were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 2 . 5 parts by weight of plasdone ® s - 630 were weighted and 12 . 5 parts by weight of dichloromethane were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 0 . 2 parts by weight of pvp k - 30 were weighted and 12 . 5 parts by weight of dichloromethane were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . one part by weight of dronedarone hydrochloride and 10 parts by weight of plasdone ® s - 630 were weighted and 12 . 5 parts by weight of dichloromethane were added into and the mixture was dissolved by stirring . then the solution was transferred to a vacuum oven and dried under reduced pressure at 55 ° c . for 48 h . the dry mass was crushed and passed through a 100 mesh sieve thereby the solid dispersion of dronedarone hydrochloride was obtained . the micromeritic properties of the solid dispersion powder obtained in the examples above were measured as follows : as shown in the above table , if the drying under reduced pressure was used , good micromeritic properties can be obtained by all the prepared solid dispersions . the types of the carriers and the weight ratios of the carriers to the active ingredient had no significant effects on micromeritic properties of the solid dispersions . working conditions : 10 ° c ./ min , temperature range : 50 - 300 ° c . the differential scanning calorimetry tests were conducted on the dronedarone hydrochloride raw material , povidone pvp - k30 and the solid dispersion prepared in example 2 . fig2 shows the dsc spectrum of dronedarone hydrochloride raw drug . fig4 shows the dsc spectrum of dronedarone hydrochloride in solid dispersion obtained in example 2 . as shown in the figures above , crystalline endothermic peak of dronedarone hydrochloride raw drug appeared at about 144 ° c ., indicating that the raw drug was present in the form of crystalline state . however , in the figure of the solid dispersion , the endothermic peak disappeared , indicating that the drug in the solid dispersion was converted to an amorphous or molecular state from crystalline state . working conditions : scan speed : 10 degrees / min ; step : 0 . 02 degrees ; target : cu ; pipe pressure / pipe flow : 40 kv / 50 ma . the powder x - ray diffraction tests were conducted on the dronedarone hydrochloride raw drug , povidone pvp - k30 and the solid dispersion prepared in example 2 . fig5 shows the x - ray diffraction spectrum of dronedarone hydrochloride raw drug . fig6 shows the x - ray diffraction spectrum of pvp carrier . fig7 shows the x - ray diffraction spectrum of dronedarone hydrochloride in the solid dispersion obtained in example 2 . as shown in the figures above , apparent crystalline diffraction peaks of dronedarone hydrochloride raw drug appeared at 2θ = 7 . 64 , 8 . 06 , 12 . 98 , 13 . 80 , 15 . 68 , 21 . 40 , 21 . 60 , 26 . 06 etc . ; weaker crystalline diffraction peaks of povidone pvp - k30 appeared at 2θ = 10 . 98 , 14 . 42 . however , in the x - ray diffraction spectrum of the solid dispersion , all the crystalline diffraction peaks of the drug disappeared , which further confirmed that the drug was present in the solid dispersion in amorphous or molecular state .
a dronedarone solid dispersion and preparation method thereof are disclosed . the solid dispersion is composed of active ingredient dronedarone or its pharmaceutically acceptable salt and a carrier material , wherein the carrier material is povidone , copovidone , hydroxypropyl cellulose , or a mixture thereof .