WO1997009036A2 - Improved pharmaceutical ion exchange resin composition - Google Patents

Improved pharmaceutical ion exchange resin composition Download PDF

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Publication number
WO1997009036A2
WO1997009036A2 PCT/GB1996/002156 GB9602156W WO9709036A2 WO 1997009036 A2 WO1997009036 A2 WO 1997009036A2 GB 9602156 W GB9602156 W GB 9602156W WO 9709036 A2 WO9709036 A2 WO 9709036A2
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WO
WIPO (PCT)
Prior art keywords
sugar
sugar alcohol
process according
ion exchange
exchange resin
Prior art date
Application number
PCT/GB1996/002156
Other languages
French (fr)
Other versions
WO1997009036A3 (en
Inventor
Sandra Therese Antoinette Malkowska
Derek Allan Prater
Stewart Thomas Leslie
Adrian Brown
Trevor John Knott
Original Assignee
Euro-Celtique S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Euro-Celtique S.A. filed Critical Euro-Celtique S.A.
Priority to EP96928628A priority Critical patent/EP0847273B1/en
Priority to AT96928628T priority patent/ATE213152T1/en
Priority to US09/029,151 priority patent/US6077532A/en
Priority to AU68347/96A priority patent/AU6834796A/en
Priority to DE69619250T priority patent/DE69619250T2/en
Publication of WO1997009036A2 publication Critical patent/WO1997009036A2/en
Publication of WO1997009036A3 publication Critical patent/WO1997009036A3/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A61K9/1605—Excipients; Inactive ingredients
    • A61K9/1629—Organic macromolecular compounds
    • A61K9/1652—Polysaccharides, e.g. alginate, cellulose derivatives; Cyclodextrin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
    • A61K47/58—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. poly[meth]acrylate, polyacrylamide, polystyrene, polyvinylpyrrolidone, polyvinylalcohol or polystyrene sulfonic acid resin
    • A61K47/585—Ion exchange resins, e.g. polystyrene sulfonic acid resin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
    • A61K9/1605—Excipients; Inactive ingredients
    • A61K9/1617—Organic compounds, e.g. phospholipids, fats
    • A61K9/1623—Sugars or sugar alcohols, e.g. lactose; Derivatives thereof; Homeopathic globules

Definitions

  • the present invention relates to a process of preparing pharmaceutical ion exchange resin compositions
  • European Patent Application Publication No 368682 describes a process for the preparation of a pharmaceutical ion exchange resin composition that is readily dispersible in water comprising granulating an ion exchange resin having a pharmacologically active ingredient bound thereto with a sugar or a sugar alcohol in the presence of sufficient water to facilitate granulation
  • Unit doses are prepared by filling e g capsules, sachets or other suitable containers with the granules
  • the product of EP 368682 is satisfactory when made at pilot scale of manufacture (ca 10-12 kg), it has been found at production scale of manufacture (ca 100kg or more), that a variable level of pharmaceutically active ingredient is obtained in unit doses prepared from a single batch of granulate
  • unit doses prepared from one batch of granulate and with a desired morphine content of 20mg may have morphine contents in the range of 18 5 to 23 5 mg and a mean content of 21 5 mg (coefficient of variations 8 3
  • One aim of the present invention is to provide a process for preparing a pharmaceutical ion exchange resin composition which can be used to prepare unit doses having a reduced inter- unit dose variability of the content of active ingredient This has, surprisingly, been achieved by using an aqueous solution of a sugar or sugar alcohol as a granulating medium instead of water
  • a process for preparing a granular pharmaceutical ion exchange resin composition that is readily dispersible in water by granulating an ion exchange resin, having a pharmacologically active ingredient bound thereto, with a particulate sugar or sugar alcohol, characterised by the use of an aqueous solution of a sugar or sugar alcohol as a granulating medium
  • compositions prepared by the process of this invention disperse readily in water
  • dispersion readily occurs inside a minute upon stirring in sufficient water
  • a composition of this invention disperses with stirring with 60 seconds in at least 5. for instance 20 times its own weight in water
  • the aqueous solution of sugar or sugar alcohol is conveniently added to a mixture of resin and particulate sugar or sugar alcohol during granulation.
  • the sugar or sugar alcohol in the granulating fluid is identical to the sugar or sugar alcohol with which the resin is granulated.
  • the sugar or the sugar alcohol present in the solution and present as solid has a molecular weight of from 90 to 550, especially from 150 to 370.
  • the preferred sugars are mono- or di-saccharides and the preferred sugar alcohols are reduced mono- or di ⁇ saccharides.
  • Suitable sugars/sugar alcohols are sucrose, dextrose, maltose, fructose, lactose, mannitol, sorbitol or, which is preferred, xylitol.
  • the particulate sugar/sugar alcohol granules is preferably finely divided, preferably having particle sizes of 600 microns or less. In a particularly preferred embodiment of the present process, at least 90% (by weight) of the particulate sugar/sugar alcohol granules will have particle sizes of 250 microns or less.
  • the sugar or sugar alcohol is present in the solution at a concentration of 40% w/w to 60%) w/w, e.g. 45%o w/w to 55% w/w most preferably about 50% w/w
  • the amount of granulating medium employed is from 1 to 20%, especially from 4 to 15%), by weight of the weight of the final dry weight of the complex/sugar, sugar alcohol mix.
  • the granules formed are then dried, preferably, until their water content is below 0.35%> (by weight) (when measured by the Karl Fischer method of moisture analysis).
  • Any acidic or basic drug may be bound to the ion exchange resin.
  • active ingredients having a biological half life of 8 hours or less are used.
  • Suitable ingredients include
  • Narcotic analgesics such as codeine, dihydrocodeine, hydromorphone, morphine, pentazocine and propoxyphene,
  • Syrnpathomimetics such as norephedrine and pseudoephedrine
  • Antitussives such as dextromethorphan
  • Analgesics such as aspirin and tramadol
  • Anticholinergics such as atropine, lpratropium bromide and scopolamine
  • vu Muscle relaxants such as cyclobenzap ⁇ ne and papave ⁇ ne
  • vm Bronchodilators such as salbutamol, terbutalme and theophylline
  • Antibiotics such as amoxycillin, ampicillin, azlocil n, bacampicil n, cefamandole, cefomcid, cefotaxime, cefotetan, cefoxitin, ceft ⁇ axone, mezlocillin and piperacilhn,
  • Antidepressants such as bupropion, nomifensine and nort ⁇ ptyhne
  • xi Antiasthmatics such as cromolyn
  • xii Antineoplastics such as tamoxifen
  • xi ⁇ Antiepileptics such as valproic acid and phenvtoin
  • Cardiovascular agents such as propranolol
  • ion exchange resins have acrylic, methacrylic, phenol-formaldehyde or dextran matrices
  • a preferred cationic ion exchange resin is a gel styrene-divinyl benzene sulphonic acid resin, such as Amberlite IR P69 (Trade Mark) and Dowex 50W-8 100-200 (Trade Mark)
  • the particle size and the degree of cross linking of the resin is determined by amongst other factors, the drug employed and the rate of drug release required
  • the resin has a particle size of from 0 045 to 1mm, especially from 0 045 to 0 5mm
  • the preferred degree of cross-linking is from 2% to 16%, especially from 8%> to 12%
  • the amount of drug bound to the resin is also determined by the choice of drug, as well as by the resin employed.
  • the weight ratio of bound drug to resin is from 1 :3 to 2: 1, especially from 2:3 to 3:2.
  • Adsorption of the drug onto the ion exchange resin particles is a well known technique as shown in GB 824337, GB 1218102 and US 2990332 and demonstrated in the examples of EP-A 368682.
  • the drug is mixed with an aqueous suspension of the resin and the complex is then dried. Adsorption of the drug onto the resin is detected by an assay of the suspending fluid.
  • the process of the present invention provides drug resin complexes or granules which upon oral administration result in adsorption of the active ingredient from the gastro-intestinal tract enabling therapeutically effective blood levels of the active ingredient to be achieved: suitably the compositions are controlled release compositions and in their most preferred form enable therapeutically effective blood levels to be maintained upon dosing in at least 12 hourly intervals.
  • the drug-resin complex or the granules may be film coated with a material that permits release ofthe drug from the composition at a controlled rate.
  • the film coat will generally include a water insoluble material such as
  • the film coat comprises a mixture of the water insoluble material and a water soluble material.
  • the ratio of water insoluble to water soluble material is determined by, amongst other factors, the release rate required and the solubility characteristics of the materials selected.
  • the water soluble material may be, for example, triacetin, propylene glycol, polyethylene glycol, polyvinylpyrrolidone or, which is preferred, a water soluble cellulose, such as hydroxypropyl cellulose, or especially, hydroxypropylmethyl cellulose
  • Suitable combinations of water insoluble and water soluble materials for the film coat include shellac and polyvinylpyrrolidone or, which is preferred, ethyl cellulose and hydroxypropylmethyl cellulose
  • composition may then be presented in a suitable dosage form, such as a capsule or a sachet This is done simply by filling the capsule/sachet with the finished composition
  • a morphine sulphate controlled release resin was prepared as described in Example 1 of EP- A 368682
  • Comparative Example 1 The process of Comparative Example 1 was repeated three times except that the amount of milled xylitol added to the mixer granulator was 52.98 kg and 8kg of a 50% w/w solution of xylitol was gradually added to the blend of morphine resin complex and milled xylitol over 18 minutes.
  • Example 1 The process of Example 1 was repeated four times using the relative amounts of ingredients given below to provide Batches 10 to 13 respectively which were then used to prepare sachets having nominal strengths of mo ⁇ hine in the range of 30 mg (Batch 10), 60 mg (Batch 1 1) 100 mg (Batch 12) and 200 mg (Batch 13). mg Mo ⁇ hine sulphate/Dowex W50 x 8 100-200 (Trade Mark) resin complex 63.0 Xylitol USNF milled 458.0

Abstract

A process is provided for preparing a granular pharmaceutical ion exchange resin composition that is readily dispersible in water by granulating an ion exchange resin, having a pharmacologically active ingredient bound thereto, with a particulate sugar or sugar alcohol. The process is characterised by the use of an aqueous solution of a sugar or sugar alcohol as a granulating medium.

Description

IMPROVED PHARMACEUTICAL ION EXCHANGE RESIN COMPOSITION
The present invention relates to a process of preparing pharmaceutical ion exchange resin compositions
European Patent Application Publication No 368682 describes a process for the preparation of a pharmaceutical ion exchange resin composition that is readily dispersible in water comprising granulating an ion exchange resin having a pharmacologically active ingredient bound thereto with a sugar or a sugar alcohol in the presence of sufficient water to facilitate granulation Unit doses are prepared by filling e g capsules, sachets or other suitable containers with the granules Although the product of EP 368682 is satisfactory when made at pilot scale of manufacture (ca 10-12 kg), it has been found at production scale of manufacture (ca 100kg or more), that a variable level of pharmaceutically active ingredient is obtained in unit doses prepared from a single batch of granulate For instance, in the case of an ion exchange resin composition containing morphine sulphate, unit doses prepared from one batch of granulate and with a desired morphine content of 20mg may have morphine contents in the range of 18 5 to 23 5 mg and a mean content of 21 5 mg (coefficient of variations 8 3%)
One aim of the present invention is to provide a process for preparing a pharmaceutical ion exchange resin composition which can be used to prepare unit doses having a reduced inter- unit dose variability of the content of active ingredient This has, surprisingly, been achieved by using an aqueous solution of a sugar or sugar alcohol as a granulating medium instead of water
According to the present invention there is provided a process for preparing a granular pharmaceutical ion exchange resin composition that is readily dispersible in water by granulating an ion exchange resin, having a pharmacologically active ingredient bound thereto, with a particulate sugar or sugar alcohol, characterised by the use of an aqueous solution of a sugar or sugar alcohol as a granulating medium
The pharmaceutical ion exchange resin compositions prepared by the process of this invention disperse readily in water For example, dispersion readily occurs inside a minute upon stirring in sufficient water Preferably a composition of this invention disperses with stirring with 60 seconds in at least 5. for instance 20 times its own weight in water The aqueous solution of sugar or sugar alcohol is conveniently added to a mixture of resin and particulate sugar or sugar alcohol during granulation.
Preferably the sugar or sugar alcohol in the granulating fluid is identical to the sugar or sugar alcohol with which the resin is granulated.
Preferably the sugar or the sugar alcohol present in the solution and present as solid has a molecular weight of from 90 to 550, especially from 150 to 370. The preferred sugars are mono- or di-saccharides and the preferred sugar alcohols are reduced mono- or di¬ saccharides. Suitable sugars/sugar alcohols are sucrose, dextrose, maltose, fructose, lactose, mannitol, sorbitol or, which is preferred, xylitol.
The particulate sugar/sugar alcohol granules is preferably finely divided, preferably having particle sizes of 600 microns or less. In a particularly preferred embodiment of the present process, at least 90% (by weight) of the particulate sugar/sugar alcohol granules will have particle sizes of 250 microns or less.
Preferably the sugar or sugar alcohol is present in the solution at a concentration of 40% w/w to 60%) w/w, e.g. 45%o w/w to 55% w/w most preferably about 50% w/w
Preferably, the amount of granulating medium employed is from 1 to 20%, especially from 4 to 15%), by weight of the weight of the final dry weight of the complex/sugar, sugar alcohol mix. Once the drug-resin complex and the sugar/sugar alcohol have been granulated, the granules formed are then dried, preferably, until their water content is below 0.35%> (by weight) (when measured by the Karl Fischer method of moisture analysis).
Any acidic or basic drug may be bound to the ion exchange resin. Preferably, however, active ingredients having a biological half life of 8 hours or less are used.
Suitable ingredients include
i. Narcotic analgesics, such as codeine, dihydrocodeine, hydromorphone, morphine, pentazocine and propoxyphene,
ii. Syrnpathomimetics, such as norephedrine and pseudoephedrine,
iii. Antitussives, such as dextromethorphan, iv Analgesics, such as aspirin and tramadol,
v Antiemetics such as metoclopramide,
vi Anticholinergics, such as atropine, lpratropium bromide and scopolamine,
vu Muscle relaxants, such as cyclobenzapπne and papaveπne,
vm Bronchodilators, such as salbutamol, terbutalme and theophylline,
ix Antibiotics, such as amoxycillin, ampicillin, azlocil n, bacampicil n, cefamandole, cefomcid, cefotaxime, cefotetan, cefoxitin, ceftπaxone, mezlocillin and piperacilhn,
x Antidepressants, such as bupropion, nomifensine and nortπptyhne,
xi Antiasthmatics, such as cromolyn,
xii Antineoplastics, such as tamoxifen
xiπ Antiepileptics, such as valproic acid and phenvtoin,
xiv Cardiovascular agents, such as propranolol
Acid addition salts or if appropriate, alkali or alkaline earth metal salts of the above drugs would be particularly suitable for use in the present process
Similarly, a wide range of cationic (for the basic drugs) or anionic (for the acidic drugs) exchange resins may be used to bind the active ingredient Suitable ion exchange resins have acrylic, methacrylic, phenol-formaldehyde or dextran matrices However, a preferred cationic ion exchange resin is a gel styrene-divinyl benzene sulphonic acid resin, such as Amberlite IR P69 (Trade Mark) and Dowex 50W-8 100-200 (Trade Mark)
The particle size and the degree of cross linking of the resin is determined by amongst other factors, the drug employed and the rate of drug release required Preferably, however, the resin has a particle size of from 0 045 to 1mm, especially from 0 045 to 0 5mm The preferred degree of cross-linking is from 2% to 16%, especially from 8%> to 12% The amount of drug bound to the resin is also determined by the choice of drug, as well as by the resin employed. Preferably the weight ratio of bound drug to resin is from 1 :3 to 2: 1, especially from 2:3 to 3:2.
Adsorption of the drug onto the ion exchange resin particles is a well known technique as shown in GB 824337, GB 1218102 and US 2990332 and demonstrated in the examples of EP-A 368682. In general, the drug is mixed with an aqueous suspension of the resin and the complex is then dried. Adsorption of the drug onto the resin is detected by an assay of the suspending fluid.
In a preferred form the process of the present invention provides drug resin complexes or granules which upon oral administration result in adsorption of the active ingredient from the gastro-intestinal tract enabling therapeutically effective blood levels of the active ingredient to be achieved: suitably the compositions are controlled release compositions and in their most preferred form enable therapeutically effective blood levels to be maintained upon dosing in at least 12 hourly intervals.
Optionally, the drug-resin complex or the granules may be film coated with a material that permits release ofthe drug from the composition at a controlled rate.
The film coat will generally include a water insoluble material such as
(a) a wax, either alone or in admixture with a fatty alcohol,
(b) shellac or zein,
(c) a water insoluble cellulose derivative, especially ethyl cellulose,
(d) a polymethacrylate, especially Eudragit (Trade Mark).
Preferably, the film coat comprises a mixture of the water insoluble material and a water soluble material. The ratio of water insoluble to water soluble material is determined by, amongst other factors, the release rate required and the solubility characteristics of the materials selected. The water soluble material may be, for example, triacetin, propylene glycol, polyethylene glycol, polyvinylpyrrolidone or, which is preferred, a water soluble cellulose, such as hydroxypropyl cellulose, or especially, hydroxypropylmethyl cellulose
Suitable combinations of water insoluble and water soluble materials for the film coat include shellac and polyvinylpyrrolidone or, which is preferred, ethyl cellulose and hydroxypropylmethyl cellulose
Once the above processing is complete, the composition may then be presented in a suitable dosage form, such as a capsule or a sachet This is done simply by filling the capsule/sachet with the finished composition
The present process and compositions prepared by the present process will now be described by way of example only,
Comparative Example 1
A morphine sulphate controlled release resin was prepared as described in Example 1 of EP- A 368682
56 98kg milled xylitol having a particle size of 90% less than 200μm and not more than 10%> less than 15μm, was blended with 4 62kg of the moφhine resin complex and 2.20kg Xanthan gum in a high shear mixer/granulator for 12 minutes at impeller/chopper speeds of 1/1 with the gradual addition of 4 4kg water over 19 5 minutes The resulting granules were removed and partially dried in a fluid bed drier with inlet air at 60°C The partially dried mass was passed through a 900μm mesh screen and drying was continued in the fluid bed drier with an inlet air temperature of 60°C until a moisture content of less than 0 35% w/w was achieved The dried granules were then passed through a 630μm screen after which they were blended with flavouring and coloring agents for 10 minutes in a Y-cone blender to provide Batch No 1 The contents of this batch was used to fill 110,000 sachets such that each sachet represents a unit dose containing nominally 20 mg morphine sulphate The composition in each sachet was as follows - mg Morphine sulphate/Dowex W50 x 8 100-200 (Trade Mark) resin complex 42 0 Xylitol USNF milled 518.0
Xanthan gum USNF 20 0
Raspberry Flavour 52 354/TP 05.51 1.0
Panceau 4R 2 0 Comparative Examples 2 to 6
The process described in the Comparative Example 1 was repeated five times using the relative amounts of ingredients given below to provide Batches 2 to 6 respectively which were then used to prepare sachets having nominal strengths of morphine, of 30 mg (Batches 2 and 3), 60 mg (Batch 4), 100 mg (Batch 5) and 200 mg (Batch 6).
mg Morphine sulphate/Dowex W50 x 8 100-200 (Trade Mark) resin complex 63.0 Xylitol USNF milled 497.0
Xanthan gum USNF 20.0
Raspberry Flavour 52 354/TP 05.51 1.0
Ponceau 4R 2.0
Examples 1, 2 and 3
The process of Comparative Example 1 was repeated three times except that the amount of milled xylitol added to the mixer granulator was 52.98 kg and 8kg of a 50% w/w solution of xylitol was gradually added to the blend of morphine resin complex and milled xylitol over 18 minutes.
The resulting Batches 7, 8 and 9 respectively were used to prepare sachets containing nominally 20 mg morphine sulphate. The amount of material used per sachet was as follows :- mg Moφhine sulphate/Dowex W50 x 8 100-200 (Trade Mark) resin complex 42.0 Xylitol USNF milled 482.0
Xanthan gum 20.0
Xylitol USNF 36.4
Raspberry Flavour 52 354/TP 05.51 1.0
Ponceau 4R 2.0
Examples 4 to 7
The process of Example 1 was repeated four times using the relative amounts of ingredients given below to provide Batches 10 to 13 respectively which were then used to prepare sachets having nominal strengths of moφhine in the range of 30 mg (Batch 10), 60 mg (Batch 1 1) 100 mg (Batch 12) and 200 mg (Batch 13). mg Moφhine sulphate/Dowex W50 x 8 100-200 (Trade Mark) resin complex 63.0 Xylitol USNF milled 458.0
Xanthan gum USNP 20.0
Xylitol USNF 38.6
Raspberry Flavour 52 354/TP 05.51 1.0
Ponceau 4R 2.0
Reference Example 1
The various sachets obtained by the process described above were assayed for moφhine content using an HPLC assay method (Spherisorb ODS-2 or equivalent column) with the following results:
Figure imgf000009_0001

Claims

A process of preparing a granular pharmaceutical ion exchange resin composition that is readily dispersible in water by granulating an ion exchange resin, having a pharmaceutically active ingredient bound thereto, with a particulate sugar or sugar alcohol, characterised by the use of an aqueous solution of a sugar or sugar alcohol as a granulating medium.
A process according to claim 1, characterised in that the aqueous solution of a sugar or sugar alcohol is added to a mixture of drug resin/complex and sugar or sugar alcohol during granulation.
A process according to claim 1 or 2, characterised in that the sugar or sugar alcohol in the aqueous solution thereof is identical to the particulate sugar or sugar alcohol.
A process according to any one of claims 1 to 3, characterised in that the aqueous solution has a concentration of from 40% to 60% w/w, preferably 50% w/w, of sugar or sugar alcohol.
A process according any one of claim 1 to 4, characterised in that the sugar or the sugar alcohol in particulate and/or solution form comprises sucrose, dextrose, maltose, fructose, lactose, mannitol, sorbitol or xylitol, preferably xylitol.
A process according to any one of claims 1 to 5, characterised in that all of the sugar or the sugar alcohol particles has a particle size of 600 microns or less.
A process according to claim 6, characterised in that at least 90% (by wt) of the sugar or the sugar alcohol particles has a particle size of 200 microns or less.
A process according to any one of claims 1 to 7, characterised in that the final composition contains from 25% to 99%, preferably from 70% to 95%, (by weight) ofthe sugar or the sugar alcohol.
A process according to any one of claims 1 to 8, characterised in that the amount of aqueous solution of sugar or sugar alcohol employed in the granulation is from 1% to 20%, preferably from 4% to 15%>, (by weight) of the combined weight of the final dry weight of the drug-resin complex and the sugar or the sugar alcohol particles.
10. A process according to any one of claims 1 to 9 characterised in that, subsequent to the granulation, the granules are dried until their water content is below 0.35% (by weight)
11. A process according to any one of claims 1 to 10 further characterised in that a capsule or a sachet is filled with the composition.
PCT/GB1996/002156 1995-09-01 1996-09-02 Improved pharmaceutical ion exchange resin composition WO1997009036A2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP96928628A EP0847273B1 (en) 1995-09-01 1996-09-02 Improved pharmaceutical ion exchange resin composition
AT96928628T ATE213152T1 (en) 1995-09-01 1996-09-02 IMPROVED DRUGS USING AN ION EXCHANGE RESIN
US09/029,151 US6077532A (en) 1995-09-01 1996-09-02 Pharmaceutical ion exchange resin composition
AU68347/96A AU6834796A (en) 1995-09-01 1996-09-02 Improved pharmaceutical ion exchange resin composition
DE69619250T DE69619250T2 (en) 1995-09-01 1996-09-02 IMPROVED MEDICINES WITH AN ION EXCHANGE RESIN

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9517883.6 1995-09-01
GBGB9517883.6A GB9517883D0 (en) 1995-09-01 1995-09-01 Improved pharmaceutical ion exchange resin composition

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Publication Number Publication Date
WO1997009036A2 true WO1997009036A2 (en) 1997-03-13
WO1997009036A3 WO1997009036A3 (en) 1997-04-24

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Country Status (9)

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US (1) US6077532A (en)
EP (1) EP0847273B1 (en)
AT (1) ATE213152T1 (en)
AU (1) AU6834796A (en)
DE (1) DE69619250T2 (en)
ES (1) ES2170258T3 (en)
GB (1) GB9517883D0 (en)
PT (1) PT847273E (en)
WO (1) WO1997009036A2 (en)

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EP1834634A2 (en) * 2006-03-08 2007-09-19 Rentschler Pharma GmbH Pharmaceutical multiple-unit composition

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US6077532A (en) 2000-06-20
ATE213152T1 (en) 2002-02-15
AU6834796A (en) 1997-03-27
DE69619250D1 (en) 2002-03-21
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PT847273E (en) 2002-06-28
DE69619250T2 (en) 2002-08-14

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