DRY MIX CELLULOSE ETHER COMPOSITIONS AS BULK LAXATIVES

Abstract: Water-dispersible powdered, bulk laxative com­ positions containing cellulose ethers as the active agent are disclosed. These bulk laxative compositions form smooth, palatable dispersions in water which dispersions contain a therapeutically effective amount of the cellulose ether.

Description: DRY MIX CELLULOSE ETHER COMPOSITIONS AS BULK LAXATIVES Background of the Invention This invention relates to dry mix cellulose ether bulk laxative compositions. It hays been long known that cellulose ethers such as carboxymethylcellulose and methylcellulose are effective bulk laxatives. The cellulose ethers relieve constipation by increasing the bulk of the stool, increasing the water content of the stool, and it is believed, by a lubricating effect on the stool. Previously, cellulose ethers have been administered as bulk laxatives in the form of tablets, powders, and suspensions in highly concentrated sugar solutions. Each of these methods of administration has significant disadvantages which have limited the acceptance of these products by consumers. Tableted cellulose ethers, for example, do not readily dissolve in the digestive tract because these cellulose ethers are highly hygroscopic. The outer portion of the tablet quickly forms a gel-like hydrate which prevents break up of the tablet and greatly retards hydration of the interior portions of the tablet. Accordingly, the tablet is often excreted as an intact soft gel mass. Although some laxative effect is produced by such gel masses, the cellulose ether is most effective when dispersed uniformly ehrough- out the stool. Thus, when employed in tablet form, cellulose ethers have reduced efficacy as bulk laxatives. Cellulose ethers have also been administered as powders, which powders are swallowed by the patient. Such powders often exhibit the same type of gelation as tablets, i.e., the individual particles lump together and remain partially undissolved as they pass through the digestive tract. Moreover, administration of cellulose ethers in powder form has caused nausea, cramping and vomiting in some patients. Accordingly, cellulose ethers are not advantageously administered in powder form. Cellulose ethers have also been administered as bulk laxatives as suspensions of the cellulose ether in water containing high concentrations of sucrose or other sugars and a flavoring. See, for example, U.S. Patent No. 2,701,782 in which such suspensions are described. The sugar competes with the cellulose ether for the available water, thereby preventing the cellulose ether from hydrating sufficiently to form gels. Such suspensions are prepared by first preparing a concentrated sugar solution in water. The cellulose ether is essentially insoluble in such a concentrated sugar solution and, accordingly, cannot hydrate to form lumps and gels. The administration of cellulose ethers in such fbrm has the advantage that the cellulose ether is sufficiently dispersed that it does not form significant amounts of lumps in the digestive tract. Unfortunately, however, such suspensions are very thick and semi-gelatinous. As such, they are visually unappealing. More significantly, due to their slimy mouth feel and extreme sweetness, such suspensions are quite unpalatable. Accordingly, such cellulose ether suspensions have not gained significant consumer acceptance. Moreover; in U.S. Patent No. 2,701,782 it is taught that only very concentrated cellulose ether dispersions, e.g., 10 percent w/vol. dispersions are useful as bulk laxative compositions. Accordingly, it would be desirable to provide a cellulose ether composition useful as a bulk laxative, which composition is palatable and not visually displeas ing and which is administered without the-formation of significant amounts of lumps or gels. Summary of the Invention The present invention is such a bulk laxative composition. This invention is a particulate bulk laxative composition comprising Åa dry mixture of (a) an edible, wdter-soluble cellulose ether having efficacy as a bulk laxative, and (b) a dispersing/sweetening component. The relative proportions of the cellulose ether and the dispersing/sweetening component are chosen together such that a quantity of the bulk laxative composition having a therapeutically effective dose of the cellulose ether contains sufficient amounts of the dispersing/sweetening component that upon mixture thereof with mild agitation in 498 g (16 ounces) or less of an aqueous liquid in which the cellulose ether is soluble, a smooth mixture is formed which does not contain significant amounts of gels or lumps. It has been found that when the bulk laxative compositions of this invention are mixed with the aforementioned amount of aqueous liquid, the resulting mixture is palatable and smooth without substantial amounts of lumps or gels, and, when ingested by the patient, delivers a therapeutically effective dose of the cellulose ether. Because such mixtures containing the bulk laxative compositions of this invention are palatable, patients are more likely to take these laxatives regularly as prescribed. Furthermore, because of the uniform dispersion of the cellulose ether in the aqueous liquid,- the cellulose ether is administered in a form in which it is most effectively employed An additional advantage of the bulk laxatives of this invention is that ordinary administration thereof causes the patient to ingest significant quantities of fluids. Such simultaneous ingestion of fluids is generally recognized as necessary for proper functioning of a bulk laxative. Detailed DescriDtion of the Intention The cellulose ether employed herein is any water-soluble cellulose ether which is effective as an active agent in a bulk laxative. By "effective as an active agent in a bulk laxative11 is meant that the cellulose' ether measurably increases the bulk, water content and/or the frequency of the stools of patients to whom it is administered. Such cellulose ethers include, for example, sodium carboxymethylcellulose, methylcellulose, hydroxypropylmethylcellulose, hydroxy ethylmethylcellulose, hydroxypropylcellulose, hydroxyethylcellulose, and the like. The particular substituent and amount of substitution is not particularly critical as long as the.resulting cellulose ether is edible, water-soluble, and effective as an active agent in a bulk laxative. However, this invention is particularly useful when the cellulose ether is one which is soluble but poorly dispersible in water, such as carboxymethylcellulose, or which is soluble, poorly dispersible in cold water but readily dispersible in hot water,- such as methylcellulose or hydroxypropylmethylcellulose'. The molecular weight of the cellulose ether is not especially critical. Of the aforementioned cellulose ethers, most preferred are methylcellulose and hydroxypropylmethyl cellulose due to their non-ionic character and their inverse solubility in water. Carboxymethylcellulose and other ionic cellulose ethers are generally much less preferred from a medical standpoint because the use of such cellulose ethers generally introduces large amounts of sodium to the bulk laxative composition. Because an effective dose of the cellulose ether may be administered in either a single application or a plurality of applications, for the purposes of this invention, a therapeutically effective amount of the cellulose ether is considered to be from about 0.25 to about 8, preferably about 1 to about 4, grams of the cellulose ether per administration. Of course, the effective amount of cellulose ether may vary somewhat depending on factors such as the size, age and sex of the patient, and the severity of the problem to be treated. Since multiple doses of the bulk laxative are commonly and often advantageously administered to the patient, relatively small amounts, i.e., about 0,25 to about 3 grams of the cellulose ether may be taken in each dose. However, larger amounts of the cellulose ether may be contained in a dose if only a single daily dose of the bulk-laxative is to be taken. When less than about 0.25 gram of the cellulose ether is taken in a single dose, the large number of doses required to administer a therapeutically effective amount of the cellulose ether tends to lead to poor patient compliance. Ingestion of large amounts of the cellulose ether (i.e., above about 8 grams per dose) generally does not increase the efficacy of the cellulose ether and is therefore not preferred. The cellulose ether is present in the bulk laxative compositions of this invention in a particulate. form, such that the cellulose ether can be readily dispersed in water without the formation of significant amounts of gels, lumps and the like. Generally, the particles are of a size such that upon contact with water, hydration of the interior regions of the particle occurs in a short period of time, i.e., one minute or less. Preferably, the cellulose ether is in the form of a powder having a volume average particle diameter of less than about 400, preferably less than 250, microns (1 micron = 0.001 mm). A dispersing/sweetening component is also employed in the bulk laxative composition of this invention. The purpose of the dispersing/sweetening component is to (a) sweeten aqueous dispersions containing the bulk laxative compositions of this invention and (b) to render the cellulose ether dispersible in an aqueous liquid in which the cellulose ether is soluble under conditions of mild agitation. One essential ingredient of the dispersing/sweetening component is a sweetener. Said sweetener may be a natural sugar, such as sucrose, glucose, fructose, corn syrup solids, and the like, or a synthetic sweetener. When a natural sugar is employed, the dispersing/sweetening component may comprise only the natural sugar. In such an embodiment, the natural sugar is employed in an amount sufficient to impart to the bulk laxative composition the desired dispersibility. From about 7-30, preferably from about 10-26, grams of a natural sugar are advantageously employed per 2 grams of the cellulose ether when said natural sugar is the sole ingredient of the dispersing/- sweetening component. Any of the commonly available synthetic sweeteners are also advantageously employed herein. Exemplary such sweeteners include sodium saccharin, sodium cyclamate,- aspartame and the like. In contrast to the natural sweeteners,, these synthetic, sweeteners are generally not used as the sole ingredient of the dispersing/sweetening component. When synthetic sweeteners are employed in amounts sufficient to render the bulk laxative composition cold-water dispersible, the resulting dispersion is generally too sweet to be palatable. Thus, when synthetic sweeteners are employed herein, the dispersing/sweetening component usually contains at least one other ingredient which aids in dispersing the -cellulose ether. An exception to the foregoing statements regarding synthetic sweeteners is that certain synthetic sweeteners which are commercially available on supports such as dextrin, may be the sole ingredient of the dispersing/sweetening component Similarly, even when a natural sugar is used as the sweetener, it may be desirable to employ less sugar than that amount which imparts the desired dispersing properties to the bulk laxative composition. Thus, when synthetic sweeteners or lower amounts of sugar are desirably employed, the dispersing/sweetening component advantageously contains one or more additional ingredients which aid in dispersing the cellulose ether. The type and amount of said additional ingredient are chosen such that the resulting bulk laxative composition is a particulate solid which-is readily dispersedin 498 g (16 ouxes) or less of a cold aqueous liquid, forming an edible, palatable dispersion containing a therapeutically effective amount of the cellulose ether. While said additional ingredient may be inert, i.e., not substantialiy contributing to the taste or efficacy of the bulk laxative composition, it is desirable to employ as additional ingredients substances which themselves contribute to the flavor, texture, and/or efficacy of the bulk laxative composition. Exemplary such additional ingredients include dry particulate materials such as dry egg, solids, diverse dextrins, dry powdered milk, dry milk solids, starchs, modified or pregelatinized starch, tapioca starch, and the like. - Of course, the particular choice of additional ingredient depends on the taste and texture desired in the dispersed bulk laxative composition. For example, when the bulk laxative composition contains significant quantities of starch or modified starch, the dispersed composition may have a texture resembling that of pudding. Similarly, by manipulation of the type and amount of said additional ingredient, the bulk laxative composition, when mixed with the aqueous liquid, can be made to resemble various types of drinks or beverages such as fruit juices, fruit flavored drinks, flavored milk drinks, milk shakes and the like. Generally, when the dispersing/sweetening component comprises dry, particulate materials, from about 7-30, preferably 10-26 > grams of said,dispersing/- sweetening component are employed per each 2 grams of cellulose ether, in order to give the desired dispersibility to the composition Also useful as said other ingredient in the dispersing/sweetening component are edible, hydrophobic oils such as mineral oils, silicone oils such as polydimethylsiloxane, silica modified silicone oils, natural vegetable oils such as corn oil and sunflower oil, coconut oil, partially hydrogenated vegetable oils, and oily flavorings such as limonene. Such oils generally coat the surface of and are somewhat absorbed by cellulose ether particles. When said oils are employed as said other ingredient in the dispersing/sweetening component,' said oils are present in an amount sufficient to improve the dispersibility of the cellulose ether. The critical limitation on the maximum amount of said oils which can be employed herein is that the bulk laxative composition of this invention is a dispersible particulate solid. The amount of such oil employed herein is less than that amount which causes excessive clumping of the cellulose ether particles or creates a continuous oil phase. By "excessive clumping" is meant that such clumps do not readily disperse in cold water with mild agitation. Preferably, the amount of such hydrophobic oil employed is no more than that amount which coats and/or is absorbed by the cellulose ether particles. Generally, such a hydrophobic oil is employed in an amount in the range from about 0.5 to about 25- percent based on the weight of the cellulose ether, The use of such hydrophobic oil as said other ingredient has the advantages that (a) lesser amounts of sweeteners and additional other ingredients are often needed, since dispersion of the cellulose ether is improved with the hydrophobic oil and (b) certain hydrophobic oils, such as mineral oil, are themselves effective active agents in laxative compositions, and therefore increase, the efficacy of the compositions of this invention. In addition to the foregoing, the bulk laxative compositions of this invention optionall.y, but preferably, comprise a small amount of a flavoring, such as 'strawberry, orange, grape, raspberry, lemon, lime, cherry, licorice, spearmint, wintergreen, chocolate, eggnog, butterscotch, vanilla, banana and the like. Such natural and artificial flavorings are well known and all are suitably employed herein. Citric acid is commonly employed in conjunction with fruit flavorings. The flavoring is generally present only as a minor component of the bulk laxative composition, generally, comprising less than about 5, preferably less than about 2, weight percent of the composition. Such flavoring can be -incorporated into the dispersing composition, into the cellulose ether or into the previously blended mixture of cellulose ether and dispersing composition. Liquid or oily flavors may be employed herein so long as they are thoroughly mixed with the other components of the bulk laxative in a way that the bulk laxative composition is a dispersible particulata Such oily flavorings often improve the dispersibility of the cellulose ether due to their hydrophobic character. If desired, the flavoring may be borne on a particulate carrier therefor. In addition to the foregoing, other materials such as preservatives, buffers, colorings, anti-caking agents, antioxidants, opacifiers, vitamins and minerals, setting agents, and the like which are commonly employed in food, beverage or drug substances may be employed herein in conventional manner. The bulk laxative compositions of this invention are prepared by simple admixture of the components. Hydrophobic oils or oily flavorings, if employed, are advantageously admixed with the cellulose ether before the addition of the remaining ingredients. However, the order of addition of components is not especially critical as long as any oily or liquid flavorings are sufficiently mixed into the composition such that the composition is a' dispersible particulate. If desired, many commercially available powdered drink and food mixes are advantageously employed herein as flavored dispersing/sweetening components. For example, powdered breakfast drinks, powdered sweetened fruit drinks, the so-called "instant" puddings and the like may be admixed as packaged with the cellulose ether to form a flavored bulk laxative composition according to this invention. The amount of cellulose ether blended therewith is chosen such that a dispersible composition is obtained. -For the purposes of this invention, the bulk laxative composition is sufficiently dispersible if an amount thereof containing a therapeutically effective amount of the cellulose ether can be dispersed into 16 ounces or less of a cold aqueous liquid in which the cellulose ether is soluble, without forming significant lumps or gels under the conditions of agitation provided either by spoon stirring or by an ordinary home mixer operated at low speed. Preferably, the composition can be dispersed by hand stirring to form a smooth1 lump -free dispersion. Preferably, the bulk laxative composition is dispersible in 249 g (8 aunces) or less of the cold liquid. It is understood that the amount of cold liquid employed will depend somewhat on the amount of cellulose ether to be dispersed. When large amounts of the cellulose ether, e.g., 4 grams (g) or more, are to be disposed, generally larger amounts, e.g., 249498 g (8-16 ounces) of, cold liquid are required to disperse the bulk laxative composition. In the more preferred embodiment, wherein a single- administration of the bulk laxative composition contains from about 1-4 g of the cellulose ether, the bulk laxative' composition is preferably dispersed into 8 ounces or less of cold liquid. A cold liquid,, for the purposes of this invention, means that the liquid is at a temperature below the cloud point of the cellulose ether employed in the bulk laxative composition, preferably at a temperature below about 300C. When the cellulose ether employed does not exhibit a cloud point, a cold liquid is taken to mean a liquid having a temperature below 60"C, preferably below 30 C. "Cloud point," as that term is employed herein, means that temperature at which an aqueous solution containing 2 weight percent of the cellulose ether transmits 50 percent of the light transmitted by such solution at 200C. The bulk laxative compositions of this invention are employed by mixing an amount thereof which contains a therapeutcally effective dose of the cellulose ether and about 498 g (16 ounces) or less of an aqueous liquid such as water, milk or other suitable liquid. As discussed hereinbefore, a quantity of the bulk laxative composition cdntaining a therapeutically effective dose, i.e., about 0.25.8 g of cellulose ether, which .additionally contains typically from about 7-30, preferably 10-26 g of dispersing/sweetening component per. 2 g of cellulose ether, is dispersed in 498 g (16 ounces) or less, preferably 249 g (8 ounces) our less of the aqueous liquid. After these compositions are dispersed in such liquid, the resulting dispersion is then drunk or eaten by the patient. Mixtures of the bulk laxatives of this invention with milk, water or other suitable liquid are smooth, palatable, and essentially free of unpleasant gels and lumps. As mentioned hereinbefore, the amount of the cellulose ether present in each dose, as well as'the number of doses of the bulk laxative taken per day,- will depend somewhat on the age, sex, size of the patient, severity of the patient's particular problem, the advice of the treating physician, if any, and the particular taste and habits of the patient. Accordingly, the bulk laxatives of this invention are advantageously administered in a single dose containing as much as about 8 grams of the cellulose ether, or in a plurality of small dose containing as little as 0.25 gram of the cellulose ether per dose. Most preferably, however, the bulk laxatives of this invention are taken as a single dose containing about 2-4 grams of the cellulose ether, or as two or more doses each containing about 1-3 grams of the cellulose ether. The following examples are intended to illustrate the invention but not to limit the scope thereof. All parts and percentages are by weight unless otherwise indicated. Example 1 In this example, 2 grams of a ppwdered pharmaceutical grade methylcellulose having a 2 percent solution viscosity of 4000 cps is dry blended with 26 grams of Tan W brand instant breakfast drink (distributed by General Foods Corporation, White Plains, NY). A free flowing powder is obtained. This powder is then stirred into about 8 fluid ounces (249 g) of roatL tsçxrahre tap water. The dry bulk laxative composition mixes readily into the water forming a palatable, smooth -textured drink containing a therapeutically effective amount of methylcellulose as a bulking laxative agent. The foregoing process is repeated substituting for the Tang equal amounts of various commercially available orange flavored, powdered, instant breakfast drinks. In each case, a smooth, palatable drink containing a therapeutically effective amount of methylcellulose is obtained. Substitution of sodium carboxymethylcellulose for the methylcellulose gives equivalent results. Example 2 A 2-gram portion of food grade hydroxypropylmethylcellulose having a 2 percent solution viscosity of 100,000 cps is mixed with 26 grams of Tan,rand instant breakfast drink. The resulting powder is mixed with about 8 ounces (249 g) of tap water at room'teture and is found to mix easily with the water forming a gel-free, palatable drink containing a therapeutically effective amount of cellulose ether. Equivalent results are obtained by substituting Minute Maid brand Lemonade Crystals for the Tang brand instant breakfast drink. Example 3 Fifteen grams of granulated cane sugar are mixed with 2 grams of hydroxypropylmethylcellulose (2 percent solution viscosity equals 4,000). The resulting powdery mixture is spoon-stlrred into 187 g (6 ounces) of water to form a smooth, substantially taste-free laxative. In this example, sugar is the sole dispersant for the bulk laxative composition. Example 4 A bulk laxative composition is prepared by dry mixing 210 grams of Jello-0 ebrand butterscotch flavored Instant Pudding and Pie Filling with 20 grams of methylcellulose (2 percent solution viscosity equals 4,000 cps). About 22 grams of the resulting bulk laxative composition is mixed with 187 g (6 ounces) of cold milk and spoon-stirred for 2 minutes. After stirring, the mixture is allowed to stand for 5 minutes. The result is a smooth, creamy pudding containing a therapeutically effective amount of methylcellulose. Similar results are obtained when the amount of pudding mix is varied between 150 and 250 grams per 20 grams methylcellulose. In addition, various other flavors of Instant Pudding Mix are used, again giving similar results. Example 5 Food grade methylcellulose (2 grams), limonene oil (0.1 gram), and granulated sucrose (7.5 grams) are thoroughly mixed together. The resulting mixture is a free flowing particulate which disperses readily into 8 ounces of room--temperature water to form a smooth dispersion In this example, limonene oil acts as both a flavoring and as an ingredient in-the dispersing/sweetening component of the bulk laxative composition. Example 6 This example illustrates a low calorie bulk laxative composition according to this invention. Two grams of pharmaceutícal-grade methylcellulose as is employed in Example 4 is mixed with 3.6 grams Sugar Twinbrandlow calorie sweetener (sodium saccharin on a dextrin support), 0.75 gram of Kool-AidX brand orange flavored unsweetened soft drink mix, and 0.4 gram of partially hydrogenated soybean oil. The resulting mixute is a flowable particulate bulk laxative composition. This composition is sooon-stirred into 218 g (7 ounces) of 10 C tap water to form a smooth dispersion containing a therapeutically effective amount of methylcellulose. Example 7 Into 8 ounces of cold tap water are stirred 22.0 g of a commercially available dry pbwder orange flavor instant breakfast drink. To the resulting solution are added 2 g of a methylcellulose as described in Example 1. Despite vigorous stirring the methylcellulose agglomerates into gelatinous lumps, which cannot be dispersed by hand stirring. It is seen, therefore, that using the levels of dispersing/sweetening component employed in this invention, it is critical to pre-mix the cellulose ether with the dispersing/sweetening component to prepare the bulk laxative composition. Example 8 Eight grams of methylcellulose, as described in Example 1, are dry-mixed with 73 g of a commercially available vanilla flavored instant breakfast drink. To the resulting dry-mix bulk laxative composition are added 498 g (16 ounces) of cold milk. With stirring, a lump -free composition resembling a milkshake in texture and consistency is obtained. Example 9 To 0.25 g methylcellulose (as described in Example 1) are added 7.5 g of Tang &commat; instant breakfast drink. These components are thoroughly blended to prepare a dry-mix bulk laxative compostion and then stirred into 62 g (2 ounces) of cold water. A tasty, smooth dispersion is obtained, which contains a relatively small dosage of methylcellulose.

Claims: WHAT IS CLAIMED IS: 1. A particulate dry mix bulk laxative composition comprising (a) a water-soluble cellulose ether having efficacy as a bulk laxative and (b) a dispersing/sweetening component, the relative proportions of the cellulose ether and the dispersing/- sweetening component being together selected such that a quantity of the bulk laxative composition containing a therapeutically effective amount of the cellulose ether contains sufficient of the dispersing/sweetening component such that upon mixture thereof with mild agitation, in 124-498 g (4-16 ounces)-or less of a cold aqueous liquid in which the cellulose ether is soluble, a dispersion is formed without significant amounts of gels and lumps 2. The bulk laxative composition of Claim 1 wherein the cellulose ether is methylcellulose, hydroxy propylmethylcellulose, or sodium carboxymethylcellulose. 3. The bulk laxative composition of Claim 1 wherein the dispersing/sweetening component comprises sugar. 4. The bulk laxative composition of Claim 3 wherein the cellulose ether is methylcellulose, hydroxypropylmethylcellulose or sodium carboxymethylcellulose. 5. The bulk laxative composition of Claim 1 further comprising a flavoring. 6. The bulk laxative composition of Claim 1 wherein the dispersing/sweetening component comprises a sweetener in an amount insufficient to render the bulk laxative composition dispersible in said cold aqueous liquid, and at least one additional ingredient of a type and in an amount such that the bulk laxative composition is dispersible in said cold aqueous liquid. 7. The bulk laxative composition of Claim 6 wherein the additional ingredient comprises starch, modified starch and/or dextrin. 8. The bulk laxative composition of Claim 7 which, when an amount thereof containing Åa therapeutically effective amount of cellulose ether is dispersed into 125-249 g (4-8 ounces)of coldmilk orwater, formsa di'spersion having a consistency: and teuture resembling a pudding. 9. The bulk laxative composition of Claim 1 comprising about 2 parts by weight of the cellulose ether and about 5-30 parts by weight of the dispersinq/- sweetening component. 10. The bulk laxative composition of Claim 1 wherein the dispersing/sweetening component comprises a hydrophobic, edible oil. 11. The bulk laxative composition of Claim 10 wherein the hydrophobic, edible oil is mineral oil, a silicone oil, a natural or partially hydrogenated vegetable oil, limonene or orange oil. 12. The bulk laxative composition of Claim 11 wherein the hydrophobic, edible oil is present in an amount from about 0.5 to about 25 percent based on the weight of the cellulose ether. 13. The bulk laxative composition of Claim 12 comprising 2 parts by weight of the cellulose ether, 0.1-0.5 parts by weight of mineral oil and 2-10 parts by weight of a sweetener. 14. The bulk laxative composition of Claim 5 wherein a commercially available powdered food or drink mix is employed as a flavored dispersing/sweetening component. 15. A process for preparing a particulate dry mix bulk laxative composition which comprises mixing (a) a water soluble cellulose ether having efficacy as a bulk laxative and (b) a dispersing/sweetening component wherein the relative proportions of the cellulose ether and the dispersing/sweetening component being together selected such that a quantity of the bulk laxative composition containing a therapeutically effective amount of the cellulose ether contains sufficient of the dispersing/sweetening component such that upon mixture thereof with mild agitation, in 124-498 g (4-16 ounces) or less of a c'old aqueous liquid in which the cellulose ether is soluble, a dispersion is formed without significant amounts of gels and lumps.

Inventors: LUOMA, ERIC V., TOBEY, STEPHEN W., TOMALIA, DONALD A.
Applicants: MERRELL DOW PHARMACEUTICALS INC.
Application year: 1984
Main classification: A61K9
IPC codes: A23L1