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Sustained-release tablet composition of pramipexole

a technology of sustained-release tablets and pramipexole, which is applied in the field of sustained-release tablet compositions, can solve the problems of insufficient sustained-release properties of pramipexole dihydrochloride in the hydrophilic matrix tablet, further problems, and difficulty in formulating a tablet with a suitable combination of sustained-releas

Inactive Publication Date: 2005-10-13
BOEHRINGER INGELHEIM INT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] There is now provided a sustained-release pharmaceutical composition in a form of an orally deliverable tablet comprising a water-soluble salt of pramipexole, dispersed in a matrix comprising a hydrophilic polymer and a starch having a tensile strength of at least about 0.15 kN cm−2 at a solid fraction representative of the tablet. The composition preferably exhibits sustained-release properties adequate to provide therapeutic effectiveness when administered orally not more than once daily to a subject in need thereof.

Problems solved by technology

Drugs and prodrugs having relatively high solubility in water, for example a solubility of about 10 mg / ml or greater, present challenges to the formulator wishing to provide a sustained-release dosage form, and the higher the solubility the greater are the challenges.
It has been found by the present inventors that formulation of pramipexole dihydrochloride in a hydrophilic matrix tablet is generally inadequate to provide sustained-release properties consistent with once-daily dosing.
The need to provide a coating over the matrix tablet gives rise to further problems.
It has proved difficult to formulate a tablet having a suitable combination of sustained-release and handling properties, where the drug is one having relatively high solubility, as in the case of pramipexole dihydrochloride.

Method used

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Examples

Experimental program
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Effect test

example 1

[0087] Tensile strength of six commercially obtained lots of pregelatinized starch was determined using the triaxial tensile strength test procedure described hereinabove. Data for tensile strength at a solid fraction of 0.8 are presented in Table 1.

TABLE 1Tensile strength of pregelatinized starch lots at a solid fraction of 0.8(triaxial test procedure)LotTensile strength (kN cm−2)10.32320.22030.07440.11950.28760.236

[0088] A great variation in tensile strength of pregelatinized starches was observed, ranging from 0.074 to 0.323 kN cm−2. Lots 3 and 4, exhibiting the lowest values of tensile strength, were from one manufacturer. Lots 1, 5 and 6, exhibiting the highest values of tensile strength were from a second manufacturer. Lot 2, exhibiting an intermediate value of tensile strength, was from a third manufacturer.

example 2

[0089] Tensile strength of the same six lots of pregelatinized starch was determined by the following simplified test procedure.

[0090] Compacts of each starch lot were prepared on a Carver press, Model 3888.1DT0000 fitted with 10 / 32 inch (0.7 cm) flat-faced tooling, at compression forces of 1000, 1500, 2000 and 3000 lbf (4.45, 6.67, 8.90 and 13.34 kN), for a dwell time of 4 seconds or 90 seconds. Compacts of an additional three lots of pregelatinized starch (Lots 7, 8 and 9), from the same manufacturer as Lots 3 and 4, were prepared using a dwell time of 90 seconds only. Weight and thickness of each compact was measured (diameter being equal to that of the tooling) to enable calculation of apparent density. Absolute density of each starch lot was measured by helium-air pycnometry. Solid fraction was calculated as the ratio of apparent to absolute density.

[0091] Hardness (force required to cause crushing) of each compact was determined using a Key HT 500 hardness tester. Tensile st...

example 3

[0096] Sumanirole maleate sustained-release tablets were prepared having the compositions shown in Table 3. Tablet strength in mg is expressed as sumanirole base.

TABLE 3Composition of sumanirole maleate tablets of Example 3Tablet strength (mg)0.5124881224IngredientAmount (% by weight)sumanirole maleate0.230.450.91.83.63.65.410.9HPMC type 2208, 4000 mPa s35.0035.0035.035.035.035.035.035.0pregelatinized starch63.8763.6563.262.360.560.058.252.5colloidal silicon dioxide0.400.400.40.40.40.40.40.4magnesium stearate0.500.500.50.50.51.01.01.0

[0097] All ingredients except the lubricant (magnesium stearate) were screened to remove lumps and were blended thoroughly in a low-shear mixer operating at 24 rpm for 10-30 minutes. The lubricant was then screened into the mixer and the materials were blended for a further 2-5 minutes. The resulting lubricated mixture was compressed into 350 mg pillow-shaped tablets using a Kilian S100 tableting machine.

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Abstract

A sustained-release pharmaceutical composition in a form of an orally deliverable tablet comprises a water-soluble salt of pramipexole, dispersed in a matrix comprising a hydrophilic polymer and a starch having a tensile strength of at least about 0.15 kN cm−2 at a solid fraction representative of the tablet.

Description

[0001] This application claims priority of U.S. provisional application Ser. No. 60 / 398,427 filed on Jul. 25, 2002; U.S. provisional application Ser. No. 60 / 398,447 filed on Jul. 25, 2002; and U.S. provisional application Ser. No. 60 / 479,513 filed on Jun. 18, 2003.FIELD OF THE INVENTION [0002] The present invention relates to tablet formulations, and more particularly to a sustained-release tablet composition for oral delivery of a water-soluble drug or prodrug, exemplified by pramipexole dihydrochloride. BACKGROUND OF THE INVENTION [0003] Many active pharmaceutical agents, including drugs and prodrugs, have been formulated as orally deliverable dosage forms providing sustained release (otherwise known as slow release or extended release) of such agents over a period of time effective to permit once daily administration. A well-known system for formulating such dosage forms involves a matrix comprising a hydrophilic polymer wherein the agent is dispersed; the agent is released over ...

Claims

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Application Information

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IPC IPC(8): C07D277/82A61K9/20A61K9/22A61K9/28A61K9/36A61K31/428A61K31/4745A61K47/30A61K47/36A61K47/38A61P25/16A61P43/00
CPCA61K9/2054A61K9/2059A61K31/4745A61K31/428A61K9/2866A61P25/00A61P25/16A61P25/28A61P43/00A61K9/20
Inventor AMIDON, GREGORY EVERETTGANORKAR, LOKSIDH DEVIHEIMLICH, JOHN MARKLEE, ERNEST J.NOACK, ROBERT MARTINREO, JOSEPH PETERSKOUG, CONNIE JO
Owner BOEHRINGER INGELHEIM INT GMBH
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