CONTROLLED-RELEASE SOLID PREPARATION WITH PARTIAL COATING

Abstract

Disclosed is a controlled-release solid preparation, which consists of an internal core and a coating layer, wherein part of the surface of the internal core is not covered with the coating, and is exposed to the surface of the solid preparation. Since the medicament just releases at the exposed part, the aim of controlled release can be achieved by controlling this exposed surface area.

Claims

1. A controlled-release solid preparation, consists of inner core and coating layer, said inner core contains active medicine and adjuvants, said coating layer contains sustained release/controlled release material and, said coating layer contains or does not contain active medicine, characterized in that, said inner core surface is not coated completely by coating layer, and part of said inner core surface is exposed to surface of solid preparation.

2. The solid preparation according to claim 1, said inner core is one layer or multi-layers, and said layer is sustained release layer, or contains both rapid release layer and sustained release layer; when inner core is two or more layers, components of different layers release in sequence: outermost layer releases first, then the secondary outer layer releases, at last component of innermost layer of inner core releases.

3. The solid preparation according to claim 1, said coating layer is prepared by compression coating method.

4. The solid preparation according to claim 3, characterized in that, material of said coating layer is water-soluble or water-insoluble; said water-soluble coating material is selected from hydroxypropyl methyl cellulose and/or hydroxypropyl cellulose; said water-insoluble coating material is selected from one or several of the groups consisting of ethyl cellulose, cellulose acetate polymer, acrylic resin.

5. The solid preparation according to claim 1, characterized in that, material of said coating layer can also contains water-soluble pore-forming agent, which is selected from one or several of the groups consisting of povidone, lactose, sodium chloride.

6. The solid preparation according to claim 1, which comprises another coating layer on the outer surface of said coating layer, said another coating layer contains or does not contain active ingredients.

7. The solid preparation according to claim 1, is tablet.

8. The solid preparation according to claim 7, its inner core is tablet core consisting of one layer or more than one layer of tablet.

9. Preparation method of the solid preparation according to claim 7, tablet pressing is performed in tablet press machine with following steps: 1) Mixing all the components for preparing tablet core, and the first pressing is performed by using model number I punch pin to obtain tablet core; 2) using model number II punch pin to replace model number I punch pin and, after mixing all the components for preparing tablet coating layer, filling in middle module; 3) filling the tablet core prepared in step 1) in the center of middle module and performing the second pressing, and the solid preparation is obtained, wherein the diameter of said model number I punch pin is less than that of model number II punch pin.

10. The preparation method according to claim 9, wherein said step 2) and 3) are as follows: after model number I punch pin is replaced with model number II punch pin, tablet core prepared in step 1) is firstly filled in the center of middle module, and then the uniformly mixed coating layer components are filled around tablet core in middle module to perform the second pressing.

11. The solid preparation according to claim 1, said inner core has one layer; said layer is sustained release layer; wherein components and contents of said sustained release layer in per 1000 tablets are as follows: ibuprofen 75 g, hydroxypropyl methyl cellulose K100LV 45-75 g, Methyl cellulose 15 g, lactose 129 g, magnesium stearate 3 g, micro powder silica gel 3 g; components and contents of said coating layer in per 1000 tablets are as follows: ethyl cellulose 390-465 g, lactose 250-150 g, magnesium stearate 5 g, micro powder silica gel 5 g.

12. The solid preparation according to claim 1, said inner core has one layer; said layer is sustained release layer; wherein components and contents of said sustained release layer in per 1000 tablets are as follows: aripiprazole 15 g, sodium alginate 105 g, hydroxypropyl cellulose 15 g, lactose 159 g, magnesium stearate 3 g, micro powder silica gel 3 g; components and contents of said coating layer in per 1000 tablets are as follows: aripiprazole 5 g, hydroxypropyl methyl cellulose K100LV 170 g, lactose 315 g, magnesium stearate 5 g, micro powder silica gel 5 g.

13. The solid preparation according to claim 1, said inner core has two layers; components of different layers release in sequence: outermost layer releases first, then innermost layer releases; said outermost layer is sustained release layer; innermost layer is rapid release layer; wherein components and contents of said sustained release layer in per 1000 tablets are as follows: prednisolone acetate 20 g, hydroxypropyl methyl cellulose K4M 60 g, lactose 116 g, magnesium stearate 2 g, micro powder silica gel 2 g; components and contents of said rapid release layer in per 1000 tablets are as follows: prednisolone acetate 10 g, lactose 40 g, microcrystalline cellulose 44 g, cross-linked sodium carboxymethyl cellulose 5 g, lemon yellow 0.3 g, magnesium stearate 0.7 g; components and contents of said coating layer in per 1000 tablets are as follows: ethyl cellulose 390 g, lactose 100 g, magnesium stearate 5 g, micro powder silica gel 5 g.

14. The solid preparation according to claim 1, said inner core has two layers; components of different layers release in sequence: outermost layer releases first, then innermost layer releases; said outermost layer is sustained release layer 1; innermost layer is sustained release layer 2; wherein components and contents of said sustained release layer 1 in per 1000 tablets are as follows: Lamotrigine 30 g, Hydroxypropyl methyl cellulose K4M 37.5 g, lactose 79.5 g, magnesium stearate 1.5 g, micro powder silica gel 1.5 g; components and contents of said sustained release layer 2 in per 1000 tablets are as follows: Lamotrigine 30 g, Hydroxypropyl methyl cellulose K100LV 52.5 g, lactose 66 g, natural food color 0.15 g, magnesium stearate 1.05 g; components and contents of said coating layer in per 1000 tablets are as follows: ethyl cellulose 390 g, lactose 100 g, magnesium stearate 5 g, micro powder silica gel 5 g.

15. The solid preparation according to claim 1, said inner core has three layers; outermost layer releases first, then the secondary outer layer releases, at last component of innermost layer of inner core releases, where said solid preparation also consists of film coating layer, said film coating layer as the outermost layer of said solid preparation; components and contents of said outermost layer in per 1000 tablets are as follows: ropinirole hydrochloride 0.5 g, Hydroxypropyl methyl cellulose K100LV 20 g, microcrystalline cellulose 15 g, lactose 61.5 g, magnesium stearate 1.5 g, micro powder silica gel 1.5 g; components and contents of said secondary outer layer in per 1000 tablets are as follows: ropinirole hydrochloride 0.5 g, Hydroxypropyl methyl cellulose K100LV 35 g, lactose 62.5 g, magnesium stearate 1.5 g, micro powder silica gel 1.5 g; components and contents of said innermost layer in per 1000 tablets are as follows: ropinirole hydrochloride 0.5 g, Hydroxypropyl methyl cellulose K100LV 25 g, microcrystalline cellulose 72.5 g, magnesium stearate 1 g, micro powder silica gel 1 g; components and contents of said coating layer in per 1000 tablets are as follows: duloxetine hydrochloride 50 g, ethyl cellulose 340 g, lactose 100 g, magnesium stearate 5 g, micro powder silica gel 5 g; components and contents of said film coating layer in per 1000 tablets are as follows: ropinirole hydrochloride 0.25 g, Opadry K295 coating powder 15.75 g.

16. The solid preparation according to claim 2, which comprises another coating layer on the outer surface of said coating layer, said another coating layer contains or does not contain active ingredients.

17. The solid preparation according to claim 3, which comprises another coating layer on the outer surface of said coating layer, said another coating layer contains or does not contain active ingredients.

18. The solid preparation according to claim 4, which comprises another coating layer on the outer surface of said coating layer, said another coating layer contains or does not contain active ingredients.

19. The solid preparation according to claim 5, which comprises another coating layer on the outer surface of said coating layer, said another coating layer contains or does not contain active ingredients.

20. Preparation method of the solid preparation according to claim 8, tablet pressing is performed in tablet press machine with following steps: 1) Mixing all the components for preparing tablet core, and the first pressing is performed by using model number I punch pin to obtain tablet core; 2) using model number II punch pin to replace model number I punch pin and, after mixing all the components for preparing tablet coating layer, filling in middle module; 3) filling the tablet core prepared in step 1) in the center of middle module and performing the second pressing, and the solid preparation is obtained, wherein the diameter of said model number I punch pin is less than that of model number II punch pin.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG. 1 is a structural diagram of controlled release tablet with monolayer of inner core, wherein, 1 is inner core, 2 is coating;

[0031] FIG. 2 is a structural diagram of controlled release tablet with a double layer tablet as inner core, wherein, 1 is inner coresustained release layer; 2 is inner corerapid release layer; 3 is coating;

[0032] FIG. 3 is a structural diagram of controlled release tablet with another double layer tablet as inner core, wherein, 1 is inner coresustained release 1.sup.st layer; 2 is inner coresustained release 2.sup.nd layer; 3 is coating;

[0033] FIGS. 4-7 are dissolution curves comparisons between inner core and controlled release tablet include same inner core prepared by method of this invention respectively in examples 1-4. It's can been seen that, although inner core is same, after controlled release preparation having coating layer with partially exposed inner core is prepared, release behavior is obviously different, which is easy to meet various clinical medication requirements;

[0034] It's demonstrated from above curves that, by adopting preparation method of this invention,

[0035] FIG. 4: medicine in vitro dissolution is changed to zero order release from first order release;

[0036] FIG. 5: that medicine is firstly sustained released slowly and then released rapidly can be realized;

[0037] FIG. 6: that medicine release speed is gradually fastened can be realized;

[0038] FIG. 7: at different stage that medicine is released slowly in different speed and released in a constant speed at each stage can be realized;

[0039] FIG. 8 is dissolution curves comparison among sustained release tablets in example 1, example 5, example 6, example 7; it's can be seen that, the more content of soluble materiallactose in coating is, the faster coating dissolution speed is;

[0040] FIG. 9 is dissolution curves comparison among sustained release tablets in example 1, example 8, example 9, example 10; it's can be seen that, the more content of sustained release material in inner core is, the slower inner core dissolution speed is;

[0041] FIG. 10 is a structural diagram of controlled release tablet with three layers of inner core as inner core in example 12, wherein 1 is the upper layer of inner core containing medicine; 2 is the intermediate block layer of inner core; 3 is the lower layer of inner core containing medicine; 4 is coating containing medicine; 5 is outermost film coating containing medicine;

[0042] FIG. 11 is dissolution curve of controlled release tablet in example 12, which shows release pattern combining sustained release drug delivery and pulse type drug delivery.

EMBODIMENTS

[0043] Detecting method of medicine dissolution in this invention is as follows: according to XD dissolution rate determination 1.sup.st method (for sustained release, controlled release, delay release preparations) recorded in Chinese Pharmacopoeia 2010 edition volume II appendix, tablet is put into 900 ml 0.1 mol/L hydrochloric acid solution, basket method, 100 round/minute, 37 C., pipette the appropriate amount of dissolution liquid at the specified sampling point to calculate the cumulative release rate of tablet, and drawing dissolution curve.

EXAMPLE 1

Controlled Release Preparation with One Layer of Inner Core (Only Having One Sustained Layer)

[0044] Preparation includes inner core and coating outside the inner core, and said inner core is mono-layer with only one sustained release layer. As shown in FIG. 1, part of inner core top surface is not coated by coating, and is exposed to surface of solid preparation. Components and contents are as follows: 1000 tablets in total, each tablet weigh 800 mg.

TABLE-US-00001 Inner core ibuprofen 75 g hydroxypropyl methyl 75 g cellulose K100LV Methyl cellulose 15 g lactose 129 g magnesium stearate 3 g micro powder silica gel 3 g In total 300 g

TABLE-US-00002 Coating ethyl cellulose 390 g lactose 100 g magnesium stearate 5 g micro powder silica gel 5 g In total 500 g

[0045] Preparation Method:

[0046] 1. Raw materials of inner core are weighed according to above prescription, and mixed completely for the next step; two model numbers of punch pin are selected, and diameter of said model number I punch pin is less than that of model number II punch pin;

[0047] 2. Rotary tablet press machine is used with model number I punch pin installed; filling depth and pressing force of tablet press machine are adjusted for pressing inner core; weight of inner core is 300 mg per piece, and inner core hardness is 90N;

[0048] 3. Adjuvants for coating are weighed according to prescription, and mixed completely for the next step;

[0049] 4. Rotary tablet press machine is used with model number II punch pin installed; process parameters of tablet press machine are adjusted; the pressed inner core is put in center of stamping die; then the mixed coating materials are filled for pressing tablet, to make bottom surfaces of bottom and side of inner core are coated by coating materials; total weight of tablet is 800 mg, and hardness is 100N.

[0050] Medicine dissolution is detected, and dissolution curve is shown in FIG. 4. It's can be seen from FIG. 4 that, inner core release shows trend of first order release; after controlled-release tablet is prepared by adding outer coating, tablet release shows constant speed.

[0051] In example 1, only top surface of inner core is exposed to outside; during the process of dissolution, effective ingredients in inner core is released only through top surface; release area is constant, so zero order release effect can be achieved. Medicine model prepared in example 1 is propitious as the cardiovascular and cerebrovascular medicines, which can substitute for osmotic pump technology to achieve the goal of constant medicine release.

EXAMPLE 2

Controlled Release Preparation with Inner Core of Two Layers (Sustained Release Layer and Rapid Release Layer)

[0052] Preparation includes inner core and coating outside the inner core, and said inner core is double layer tablet. As shown in FIG. 2, part of inner core top surface is not coated by coating, and is exposed to surface of solid preparation.

[0053] Components and contents are as follows: 1000 tablets in total, each tablet weigh 800 mg.

TABLE-US-00003 Inner core-sustained release layer prednisolone acetate 20 g hydroxypropyl methyl 60 g cellulose K4M lactose 116 g magnesium stearate 2 g micro powder silica gel 2 g

TABLE-US-00004 Inner core-rapid release layer prednisolone acetate 10 g lactose 40 g microcrystalline cellulose 44 g cross-linked sodium carboxymethyl cellulose 5 g lemon yellow 0.3 g magnesium stearate 0.7 g In total 300 g

TABLE-US-00005 Coating ethyl cellulose 390 g lactose 100 g magnesium stearate 5 g micro powder silica gel 5 g In total 500 g

[0054] Preparation Method:

[0055] 1. Raw materials of inner core-sustained release layer, inner core-rapid release layer are weighed according to above prescription, and mixed completely for the next step; two model numbers of punch pin are selected, and diameter of said model number I punch pin is less than that of model number II punch pin;

[0056] 2. Rotary tablet press machine is used with model number I punch pin installed; filling depth and pressing force of tablet press machine are adjusted for pressing inner core; weight of inner core-sustained release layer is 200 mg per piece, weight of inner core-rapid release layer is 100 mg per piece, and inner core hardness is 80N;

[0057] 3. Adjuvants for coating are weighed according to prescription, and mixed completely for the next step;

[0058] 4. Rotary tablet press machine is used with model number II punch pin installed; process parameters of tablet press machine are adjusted; the pressed inner core with the colored rapid release layer upwards is put in center of stamping die; then the mixed coating materials are filled for pressing tablet, to make bottom surfaces of bottom and side of inner core are coated by coating materials; total weight of tablet is 800 mg, and hardness is 100N.

[0059] Medicine dissolution is detected, and dissolution curve is shown in FIG. 5. It's can be seen from FIG. 5 that, independent inner core disintegrates rapidly due to rapid-release layer with rapid dissolution speed, 90% of its medicine dissolution only takes 6 hours. After controlled-release tablet with coating is prepared, its dissolution shows release trend of first slow and then fast.

[0060] In example 2, inner core consists of double layers of sustained release layer, rapid release layer. During the process of dissolution, sustained release part in inner core dissolves firstly with active ingredients in sustained release layer releasing slowly; after sustained release layer releases completely, rapid release layer disintegrates rapidly, so as to achieve the goal of rapid medicine delivery.

[0061] Medicine model prepared in example 2 is propitious as medicine for treating those diseases which outbreak easily in the early morning, like morning stiffness, myocardial infarction, etc. the release time of rapid release layer is controlled at 4-6 hours after taking medicine, and that patients take medicine before sleeping can avoid disease outbreak in the early morning. In addition, medicine model prepared in example 2 is propitious as medicine which can be absorbed smoothly in stomach and absorbed poorly in the lower part of stomach. In environment of low pH value, medicine release slowly, and the released part can be absorbed as well as utilized basically; when pH value is enhanced, medicine solubility decreases, medicine absorption of organism reduces; at this time, to increase medicine release amount can remedy the problem of low bioavailability.

EXAMPLE 3

Controlled Release Preparation with One Layer of Inner Core (Only Having One Sustained Layer)

[0062] Preparation includes inner core and coating outside the inner core, and said inner core is monolayer with only one sustained release layer. As shown in FIG. 1, part of inner core top surface is not coated by coating, and is exposed to surface of solid preparation. Components and contents are as follows: 1000 tablets in total, each tablet weigh 800 mg.

TABLE-US-00006 Inner core aripiprazole 15 g sodium alginate 105 g hydroxypropyl cellulose 15 g lactose 159 g magnesium stearate 3 g micro powder silica gel 3 g In total 300 g

TABLE-US-00007 Coating aripiprazole 5 g Hydroxypropyl methyl 170 g cellulose K100LV lactose 315 g magnesium stearate 5 g micro powder silica gel 5 g In total 500 g

[0063] Preparation Method:

[0064] 1. Raw materials of inner core are weighed according to above prescription, and mixed completely for the next step; two model numbers of punch pin are selected, and diameter of said model number I punch pin is less than that of model number II punch pin;

[0065] 2. Rotary tablet press machine is used with model number I punch pin installed; filling depth and pressing force of tablet press machine are adjusted for pressing inner core; weight of inner core is 300 mg per piece, and inner core hardness is 90N;

[0066] 3. Adjuvants for coating are weighed according to prescription, and mixed completely for the next step;

[0067] 4. Rotary tablet press machine is used with model number II punch pin installed; process parameters of tablet press machine are adjusted; the pressed inner core is put in center of stamping die; then the mixed coating materials are filled for pressing tablet, to make bottom surfaces of bottom and side of inner core are coated by coating materials; total weight of tablet is 800 mg, and hardness is 100N.

[0068] Medicine dissolution is detected, and dissolution curve is shown in FIG. 6. It's can be seen from FIG. 6 that, independent inner core disintegrates dissolve completely after 4 hours, and medicine release rate reach more than 90%. After controlled-release tablet with coating is prepared, medicine releases slowly in 4 hours; medicine release speed increases after 4 hours, and dissolution completes in 8 hours.

[0069] Tablet core in example 3 is mono-layer tablet. Coating contains active ingredients. The soluble hydroxypropyl cellulose is selected as coating material. In dissolution experiment, outer coating of tablet is dissolved gradually with active ingredients gradual releasing gradually, which remedies the problem of insufficient cumulative release amount due to medicine releasing only from top surface. After outer shell dissolves completely, tablet core is completely exposed to outside, and medicine begins to spread from all sides with medicine release amount enhanced. This medicine model can also be used as medicine for treating those diseases which outbreak easily in the early morning, and its effect is similar with that of example 2.

EXAMPLE 4

Controlled Release Preparation with Inner Core of Two Layers (2 Sustained Release Layers)

[0070] Preparation includes inner core and coating outside the inner core, and said inner core is double layer tablet consisting of sustained release layer 1 and sustained release layer 2. As shown in FIG. 3, part of inner core top surface is not coated by coating, and is exposed to surface of solid preparation.

[0071] Components and contents are as follows: 1000 tablet in total, each tablet weigh 800 mg.

TABLE-US-00008 Inner core-sustained release layer 1 Lamotrigine 30 g Hydroxypropyl methyl 37.5 g cellulose K4M lactose 79.5 g magnesium stearate 1.5 g micro powder silica gel 1.5 g

TABLE-US-00009 Inner core-sustained release layer 2 Lamotrigine 30 g Hydroxypropyl methyl 52.5 g cellulose K100LV Lactose 66 g Natural food color 0.15 g magnesium stearate 1.05 g In total 300 g

TABLE-US-00010 Coating ethyl cellulose 390 g lactose 100 g magnesium stearate 5 g micro powder silica gel 5 g In total 500 g

[0072] Preparation Method:

[0073] 1. Raw materials of inner core-sustained release layer 1, inner core-sustained release layer 2 are weighed according to above prescription, and mixed completely for the next step; two model numbers of punch pin are selected, and diameter of said model number I punch pin is less than that of model number II punch pin;

[0074] 2. Rotary tablet press machine is used with model number I punch pin installed; filling depth and pressing force of tablet press machine are adjusted for pressing inner core; wherein, weights of inner core-sustained release layer 1, inner core-sustained release layer 2 are respectively 150 mg per piece, total weight of inner core is 300 mg per table, and inner core hardness is 90N;

[0075] 3. Adjuvants for coating are weighed according to prescription, and mixed completely for the next step;

[0076] 4. Rotary tablet press machine is used with model number II punch pin installed; technological parameters of tablet press machine are adjusted; the pressed inner core with the colored rapid release layer upwards is put in center of stamping die; then the mixed coating materials are filled for pressing tablet, to make bottom surfaces and side of inner core are completely coated by coating materials; total weight of tablet is 800 mg, and hardness is 100N.

[0077] Medicine dissolution is detected, and dissolution curve is shown in FIG. 7. It's can be seen from FIG. 7 that, dissolution curve of independent inner core shows first order release with more than 30% released in 0.5 h, and cumulative dissolution rate in 10 hours is up to 90%. While, release of controlled-release tablet shows features of two stages: the first stage: slow release speed in 0-5 hours, and the second stage: release speed is coming fast in 5-12 h, but in these two stages, the release speeds are constant.

[0078] Tablet core in example 4 is double layer tablet consisting of two layers with two different release speed; release speed of the upper layer is slow, and that of the lower layer is fast.

EXAMPLES 5-10

[0079] Preparations of examples 5-10 is same as that of example 1. They are all preparations whose inner core is mono-layer (only one sustained release layer).

[0080] Components and contents are as follows: 1000 tablet in total, each tablet weigh 800 mg.

TABLE-US-00011 Exam- Exam- Exam- Exam- Exam- Exam- ple 5 ple 6 ple 7 ple 8 ple 9 ple 10 Inner core ibuprofen 75 g 75 g 75 g 75 g 75 g 75 g hydroxypropyl 75 g 75 g 75 g 105 g 135 g 45 g methyl cellulose K100LV Methyl 15 g 15 g 15 g 15 g 15 g 15 g cellulose lactose 129 g 129 g 129 g 99 g 69 g 159 g magnesium 3 g 3 g 3 g 3 g 3 g 3 g stearate micro powder 3 g 3 g 3 g 3 g 3 g 3 g silica gel In total 300 g 300 g 300 g 300 g 300 g 300 g Coating ethyl 440 g 465 g 340 g 390 g 390 g 390 g cellulose lactose 50 g 25 g 150 g 100 g 100 g 100 g magnesium 5 g 5 g 5 g 5 g 5 g 5 g stearate micro powder 5 g 5 g 5 g 5 g 5 g 5 g silica gel In total 500 g 500 g 500 g 500 g 500 g 500 g

[0081] In addition, this invention also discloses the influence of amount for soluble component in outer coating of controlled-release tablet and the influence of amount for sustained-release materials in inner core on medicine dissolution, and the method is same as that of example 1.

[0082] Dissolution of tablets in example 1, example 5, example 6, example 7 are compared; it's can be seen from FIG. 8 that, the more content of soluble materiallactose in coating is, the faster coating dissolution speed is.

[0083] Dissolution of tablets in example 1, example 8, example 9, example 10 are compared; it's can be seen from FIG. 9 that, the more content of sustained release material in inner core is, the slower inner core dissolution speed is;

EXAMPLE 11

[0084] Inner core of controlled release preparation has three layers (each layer has active ingredient). Incomplete coating layer also has active ingredient, and the outermost film coating also has active ingredient. As shown in FIG. 10, part of medicine layer on upper layer of inner core is not coated by coating, and is exposed to surface of solid preparation.

[0085] Components and contents are as follows: 1000 tablet in total, each tablet weigh 800 mg.

TABLE-US-00012 Upper core layer ropinirole hydrochloride 0.5 Hydroxypropyl methyl 20 cellulose K100LV microcrystalline cellulose 15 lactose 61.5 magnesium stearate 1.5 micro powder silica gel 1.5

TABLE-US-00013 Intermediate core layer ropinirole hydrochloride 0.5 Hydroxypropyl methyl 35 cellulose K100lv lactose 62.5 magnesium stearate 1 micro powder silica gel 1

TABLE-US-00014 Lower core layer ropinirole hydrochloride 0.5 Hydroxypropyl methyl 25 cellulose K100LV microcrystalline cellulose 72.5 magnesium stearate 1 micro powder silica gel 1 In total 300

TABLE-US-00015 Pressed coating layer duloxetine hydrochloride 50 ethyl cellulose 340 lactose 100 magnesium stearate 5 micro powder silica gel 5 In total 500

TABLE-US-00016 Film coating layer ropinirole hydrochloride 0.25 Opadry K295 coating 15.75 powder Water Approriate amount

[0086] Preparation Method:

[0087] 1. Raw materials of upper layer, intermediate layer, lower layer of inner core are weighed according to above prescription, and respectively mixed completely for the next step; two model numbers of punch pin are selected, and diameter of said model number I punch pin is less than that of model number II punch pin;

[0088] 2. Rotary tablet press machine is used with model number I punch pin installed; filling depth and pressing force of tablet press machine are adjusted for pressing inner core; wherein, weight of upper layer of inner core is 100 mg per piece; weight of intermediate layer is 100 mg per piece; weight of lower layer is 100 mg per piece; total weight of inner core is 300 mg, and inner core hardness is 100N;

[0089] 3. Adjuvants for coating are weighed according to prescription, and mixed completely for the next step;

[0090] 4. Rotary tablet press machine is used with model number II punch pin installed; process parameters of tablet press machine are adjusted; the pressed inner core with the colored rapid release layer upwards is put in center of stamping die; then the mixed coating materials are filled for pressing tablet, to make bottom surfaces of bottom and side of inner core are completely coated by coating materials; total weight of tablet is 800 mg, and hardness is 120N.

[0091] 5. Coating powder is weighed according to prescription to prepare coating liquid. High efficiency coating machine is used to coat the outermost film coating, and weight of coating is increased 2%.

[0092] Medicine dissolution is detected, and dissolution curve is shown in FIG. 11. It's can be seen from FIG. 11 that, medicine release shows pulse type; the outermost film coating releases medicine firstly; after 15 minutes, upper core layer begins to dissolve to release medicine; intermediate core layer begins to release medicine after 1.5 hours; lower core layer begins to release after 3.5 hours. Additionally, medicine in the pressed coating constantly releases during the whole dissolution process, after the outermost film coating dissolved.