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Spheroids for the Controlled Release of a Drug

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Spheroids for the Controlled Release of a Drug Europaisches Patentamt ® European Patent Office © Publication number: 0 288 138 Office europeen des brevets A2 EUROPEAN PATENT APPLICATION © Application number: 88301417.7 © lrrt.CI.<: A61K 9/16 @ Date of filing: 19.02.88 The title of the invention has been amended © Applicant: Euroceltique SA (Guidelines for Examination in the EPO, A-lll, 122 Boulevard de la Petrusse 7.3). Luxembourg(LU) @ Inventor: Heafield, Joanne ® Priority: 04.03.87 GB 8705083 11 Gainsborough Drive Burleigh Hill Stives Cambridge(GB) @ Date of publication of application: Inventor: Leslie, Stewart Thomas 26.10.88 Bulletin 88/43 4 Babraham Road Cambridge(GB) © Designated Contracting States: Inventor: Malkowska, Sandra Therese CH DE FR GB IT LI Antoinette 14 Abrahams Close Landbeach Cambridge(GB) Inventor: Neale, Philip John 28 London Road Harston Cambridge(GB) © Representative: James, Stephen Richard, Napp Research Centre Cambridge Science Park Milton Road Cambridge CB4 4GW(GB) © Spheroids for the controlled release of a drug. © A controlled release pharmaceutical composition contains a number of spheroids, the spheroids containing a water-insoluble drug dispersed in a controlled release matrix. The matrix contains between 70% and 99.5% (by weight) of microcrystalline cellulose, between 0.5% and 4% (by weight) of a cellulose derivative and, optionally, up to 26% of a sugar or a sugar alcohol. The water insoluble drug must dissolve in water (pH 5) at 20°C to a concentration of less than 1.0mg ml-1, preferably less than 0.5mg ml-1. Preferred drugs are non-steroidal anti-inflammatory agents, especially fenprofen I calcium, ibuprofen, ketoprofen, naproxen, diclofenac sodium, fenbufen, flurbiprofen, indomethacin, oxyphen- jbutazone, phenylbutazone or piroxicam. 00 CO 00 00 M LU Xerox Copy Centre 288 138 water- The present invention relates to a controlled release pharmaceutical composition containing a insoluble drug for administration to humans and/or animals. * of In the present specification the term "spheroid" means a spherical granule having a diameter between 0.5mm and 2.5mm, especially between 0.8mm and 2mm. that is i In the present context, microcrystalline cellulose is a non-water soluble pharmaceutical excipient $ the particularly useful for use in the formation of spheroids by spheronisation. In general terms, the greater it is to form proportion of microcrystalline cellulose present in a pharmaceutical composition, the easier control spheroids. On the other hand, microcrystalline cellulose is an excipient that normally exercises little over the release of a drug from a dosage form. This means that compositions containing a large proportion o of microcrystalline cellulose generally do not exhibit controlled release characteristics. In the past this problem has been overcome in two ways, either (1) The spheroids are coated with a controlled release coating, or less of total (2) The proportion of microcrystalline cellulose is reduced (to about 50% (by weight) or level of about excipient weight), and an excipient that does exercise control over drug release is added (to a 5 10% (by weight) or more of total excipient weight). Both of these solutions have disadvantages. In the first case an extra, uneconomic step is added to the often leads to the formation of process. In the second case, the reduced level of microcrystalline cellulose unsatisfactory spheroids or to difficulties in forming spheroids at all. water- The present inventors have now found that controlled-release spheroids containing certain, without the of \o insoluble drugs can be formulated using high levels of microcrystalline cellulose, requirement a controlled release coating. According to the present invention, therefore, there is provided a controlled release pharmaceutical composition comprising a plurality of spheroids, the spheroids comprising a water-insoluble drug dispersed of in a controlled release matrix, wherein the matrix comprises between 70% and 99.5% (by weight) derivative. !5 microcrystalline cellulose and between 0.5% and 4% (by weight) of at least one cellulose A "controlled release pharmaceutical composition" according to the present invention is one that action achieves slow release of a drug over an extended period of time and extends the duration of drug level in the over that achieved by conventional delivery. Preferably, such a composition maintains drug blood or target tissue within the therapeutic range for 8 hours or more. 20° C concentration of 30 The water-insoluble drug may be any drug that dissolves in water (pH 5) at to a less than 1.0mg ml-1, preferably less than 0.5mg ml-1. Suitable drugs include benzocaine, nifedipine, bendrofluazide, benzthiazide, chlorothiazide, chlorthalidone, cyclopenthiazide, frusemide, hydroch- lorothiazide, hydroflumethiazide, spironolactone, reserpine, chlorpropamide, glibenclamide, betamethasone, cortisone acetate, dexamethasone, hydrocortisone, prednisone, trimethoprim, digoxin, haloperidol, 35 phenytoiri, pindolol and clofibrate. such Preferably, however, the water-insoluble drug is a non-steroidal anti-inflammatory agent, as indomethacin, fenprofen calcium, ibuprofen, ketoprofen, naproxen, diclofenac sodium, fenbufen, flurbiprofen, oxyphenbutazone, phenylbutazone or piroxicam. PH The microcrystalline cellulose employed in the present composition may be, for example, Avicel Elcema (Trade 40 101, or Avicel PH 102, (Trade Marks, FMC Corporation), Emcocel (Trade Mark, Mendell), Mark, Degussa). The cellulose derivative is preferably a cellulose derivative that absorbs water, (a hydratable cellulose) for example, sodium carboxymethyl cellulose. Hydroxy lower alkyl (Ci-Cs) celluloses, such as hydrox- ypropyl cellulose or hydroxypropylmethyl cellulose, are especially preferred. ratio of the microcrystal- 45 According to one preferred embodiment of the present composition, the weight and line cellulose to the at least one cellulose derivative is between 20:1 and 100:1, especially between 30:1 70:1. In addition to the microcrystalline cellulose and the cellulose derivative, the present controlled release i that facilitate the formation of matrix may also comprise other pharmaceutical excipients and diluents is such as sucrose, 50 spheroids by spheronisation. One particularly suitable further ingredient a sugar, sorbitol. dextrose, maltose, or, which is preferred, lactose, or a sugar alcohol, such as mannitol, xylitol or and/or at least Preferably, the present matrix contains up to 26% (by weight) of at least one sugar one sugar alcohol. from the Although it is not necessary in order to achieve controlled release of the drug present for give the spheroids, the spheroids may be coated with a suitable film coating in order to, example, 0 288 138 spheroids a required colour or to ensure the release of the drug in the intestines rather than the stomach (enteric coating). A unit dose of the present pharmaceutical composition may consist of, for example, a capsule, a sachet or cachet containing a predetermined quantity of the spheroids. The quantity is predetermined by the dose 5 of drug to be incorporated in a unit dose of the composition. Preferred drug doses will be well known to those skilled in the art and include, DRUG AMOUNT OF DRUG PER UNIT DOSE Benzocaine 10 - lOOmg Nifedipine 5 - 60mg Bendrofluazide 0.25 - lOmg Benzthiazide 2 - 20mg Chlorothiazide 50mg - 2gm Chlorthalidone 5 - 200mg Cycl open thiazide 0.1 - 1.5mg Frusemide 2 - 200mg Hydrochlorothiazide- 2 - lOOmg Hydroflumethiazide 2 - 200mg Spironolactone 5 - 200mg Reserpine 0.1 - 0.5mg Chlorpropamide 50 - 500mg Gli bene! amide 2 - 15mg 35 40 45 SO 55 3 I 288 138 letamethasone u.b - bmg ;ortisone acetate 20 - 50mg lexamethasone 0.5 - 15mg iydrocortisone 20 - 50mg 'rednisone 1 - 30mg ["rimethoprim 50mg - lgm Jigoxin 0.05 - lmg ialoperidol 0.5 - lOmg 'henytoin 25 - 600mg 'indolol 2.5 - 25mg :iofibrate 250mg - 2.0gm renoprofen calcium lOOmg - lgm Ibuprofen 50 - 800mg (etoprofen 50 - 200mg Naproxen 250 - lOOOmg Diclofenac Sodium 25 - 150mg Fenbufen 200 - 900mg Flurbiprofen 50 - 300mg Indomethacin 20 - 200mg Oxyphenbutazone 50 - 250mg Phenylbutazone 50 - 250mg (human use) 500mg - 5gm (veterinary use) Piroxicam 10 - 40mg When a unit dose of the present composition is in the form ot a capsule or cacnet, me aosage rorm be may be administered directly via the oral route. In the case of a capsule or sachet the spheroids may sprinkled onto food which is then taken as part of a meal. The present controlled release pharmaceutical composition may be prepared, in a second aspect of the present invention, by (a) blending a mixture comprising a water-insoluble drug, a predetermined amount of microcrystalline cellulose, a predetermined amount of at least one cellulose derivative and water, (b) granulating and extruding the blended mixture to give a uniform, free-flowing extrudate, (c) spheronising the extrudate until spheroids are formed, (d) drying the spheroids, and (e) optionally, film coating the spheroids, to form a plurality of spheroids, the spheroids comprising a water-insoluble drug dispersed in a controlled release matrix wherein the amounts of the microcrystalline cellulose and the at least one cellulose derivative are so predetermined that the matrix comprises between 70% and 99.5% (by weight) of microcrystalline cellulose and between 0.5 and 4% (by weight) of at least one cellulose derivative. Preferably, the spheroids are dried until the moisture content is 5% (by weight) or less of the total spheroid weight (when measured by Karl Fischer titration). Preferably, after drying, in
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