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Pharmaceutical Compositions for the Oral Use Containing Disinfectant Substances and Muco-Adhesive Substances

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Pharmaceutical Compositions for the Oral Use Containing Disinfectant Substances and Muco-Adhesive Substances ~™ Mil II II II MMII I II II MM II Ml (19) J European Patent Office Office europeen des brevets (11) EP 0 839 524 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) |nt. CI.6: A61 K 9/00, A61 K 31/44, 06.05.1998 Bulletin 1998/19 A61K 31/47, A61 K 47/32 (21) Application number: 97118402.3 (22) Date of filing : 23.1 0.1 997 (84) Designated Contracting States: (72) Inventors: AT BE CH DE DK ES Fl FR GB GR IE IT LI LU MC • Ronchi, Celestino NL PT SE 2001 6 Pero (Ml) (IT) Designated Extension States: • Berlati, Fabio AL LT LV RO SI 2001 6 Pero (Ml) (IT) (30) Priority: 29.10.1996 IT MI962239 (74) Representative: Spadaro, Marco Bianchetti Bracco Minoja S.r.l. (71) Applicant: Montefarmaco S.p.A. Via Rossini 8 201 21 Milano (IT) 201 22 Milano (IT) (54) Pharmaceutical compositions for the oral use containing disinfectant substances and muco-adhesive substances (57) Solid oral pharmaceutical compositions in the form of lozenges comprising at least an active ingredi- ent in admixture with conventional carriers and excipi- ents, characterized in that they contain at least one muco-adhesive polymer. < CM LO <7> CO CO o Q_ LU Printed by Xerox (UK) Business Services 2.16.1/3.4 1 EP 0 839 524 A1 2 Description cal forms in which the main ingredient is a sugar (sac- charose) or a polyalcohol such as sorbitol or xylitol. The TECHNOLOGICAL BACKGROUND preparation technique used is a conventional technique involving melting and "cooking" the main mass and the The administration of disinfectant substances 5 subsequent subdivision either by pouring the flavoured (iodine, ammonium quaternary salts, such as cetylpyrid- mass, enriched in the active ingredient and in the muco- inium chloride, dequalinium chloride, benzethonium adhesive, into starch moulds or drawing dies or by chloride, or others such as dichlorobenzyl alcohol, amyl extrusion and subsequent cutting of the extruded mass. metacresol, silver proteinate, methylisoprinol) or of real The divided mass is cooled and left to crystallize. antibiotic substances with topical action (such as 10 Up to now, the administration of the bioadhesive tyrothricin or fusafungine) has been used for a long time polymers in sugar- or no-sugar lozenges has not been in the treatment of some conditions of infective origin described, due to the difficulty in dispersing homogene- (bacterial or fungine) typical of the pharyngo-oral cavity ously in a high temperature melted mass a biopolymer and of the periodontal areas. in minimum amounts (0.1 - 1.0%) compared with the The topical administration of the various active 15 final mass of the lozenge (which has usually a final ingredients is performed by means of the pharmaceuti- weight higher than 2 - 3 g) and in causing no structural cal forms conventionally employed for the topical use in distortions of the final product due to the permanent set the oropharynx, such as tablets, collutories, tinctures, of the biopolymer caused by the excessive temperature. sugar or no-sugar lozenges (containing xylitol, sorbitol Now it has been found that the dispersion of the or other non-cariogenic polyalcohols). 20 polymer has to occur after decreasing the temperature This type of therapy, although being widespread of the melted base mass to a critical range and mixing and having good compliance, is known to have limited in the melted mass itself a homogeneous phase result- efficacy. ing from admixture of the excipients, present in small Among the main factors limiting the efficacy of the amounts (even if non aqueous liquids, such as essential topical therapy of the infections of the oral cavity, the 25 oils or flavours, or pasty substances) with the muco- poor contact time between the oral mucosa and the adhesive and optionally with the active ingredient when active ingredients and the presence of effective concen- it is present in minimum amounts or is thermolabile. trations of active ingredients for rather short times The present invention relates to lozenges based on should be stressed; said effects being mainly due to the sugar or no-sugar excipients, obtained with the technol- dilution and washing away by the saliva. 30 ogy described herein, containing active ingredients with A method to improve the permanence of the active topical action for use in the pharyngo-oral cavity in com- ingredients at the action site, in order to increase the bination with anhydrous muco-adhesive substances efficacy of the medicament, is preparing pharmaceuti- which provide, once hydrated, a longer-lasting action cal forms which make use of the properties of polymer and a higher efficacy. muco-adhesive substances. Muco-adhesion has been 35 A further object of the present invention is a proc- studied extensively in the eighties and applied in the ess for the preparation of the lozenges cited above. development of pharmaceutical forms for the purpose of improving the absorption of the active ingredients. Detailed disclosure of the invention Among the muco-adhesive substances, cellulose derivatives (cellulose derivatives, such as the methyl, 40 The present invention relates to the use of a muco- hydroxypropylmethyl, carboxymethyl ethers or esters, adhesive substance for the preparation of lozenges etc.), polyacrylic acid derivatives (polycarbophyl, such which, when dissolved in the mouth, provide the simul- as Noveon'R)); vinylcarboxyl acid derivatives (carbomer, taneous release of both the active ingredient and the such as Carbopol(R' 9749), should be mentioned. muco-adhesive substance, which hydrating with the At present, muco-adhesive pharmaceutical forms 45 saliva makes the active ingredient to adhere to the are developed above all as forms for carrying and pharyngo-oral mucosa. More precisely, the lozenges absorbing substances difficult to absorb, such as pep- contain disinfectant active ingredients which are tides. The muco-adhesive has up to now been used to intended to exert their action topically, at the mucosa bind the pharmaceutical form, usually consisting of an surface, instead of being absorbed. insoluble or slowly erodible matrix, to the mucosa (buc- so Therefore the type of administration provides loz- cal, gastric, nasal) designed to absorb the medicament. enges for the pharmaceutical use in which the adhe- Thus, the muco-adhesive substances have been siveness of the biopolymer, deriving from the hydration administered both as constituents of a separate adhe- due to the contact with saliva, keeps the active ingredi- sive layer and as constituents of the matrix itself. ent in contact with the oral mucosa for a protracted time, Up to now, the development of crystal lozenges 55 thus making its action longer-lasting. containing muco-adhesive substances has not been The pharmaceutical compositions according to the studied or used in practice. present invention comprise one or more active ingredi- The sugar- or no-sugar- lozenges are pharmaceuti- ents in admixture with conventional carriers and excipi- 2 3 EP 0 839 52424 A1 4 ents and one or more muco-adhesive polymers. zation (in fact the mass is already in the crystallisation The muco-adhesive polymers used in the present phase) whereas higher temperatures cause structural invention are known to those skilled in the art. permanent sets of the bioadhesive polymer which Among these, the following ones are cited by way of change the shape and technological characteristics of example: polycarbophil, polyacrylic acid derivatives and s the product. the salts thereof, vinylcarboxylic acid polymers and The active ingredient, depending on its the amount copolymers and the salts thereof, cellulose derivatives and nature, can be added directly to the base mass to such as methyl, ethyl, hydroxyethyl, propyl, hydroxypro- melt, or it can be pre-mixed with the muco-adhesive and pyl ethers or esters methyl, carboxymethyl ethers and optionally other excipients, then added to the melted the like. w mass. The bioadhesive polymers can be in a combination Excipients and carriers for the compositions thereof and are used in percentages of 0.1% to 50% by according to the present invention are known in the art, weight compared with the total composition. The phar- for example as described in "Remington's Pharmaceuti- maceutical^ acceptable carrier is a substance or a mix- cals Sciences Handbook", Mack. Pub., N.Y., U.S.A.. ture of substances in which the bioadhesive polymer(s) is In an embodiment of the invention, in the prepara- is(are) dispersed or dissolved and which can be admin- tion of the lozenges as described in example 1, the istered to humans or other animals without causing muco-adhesive polycarbophil (Noveon'R) AA1) is dis- adverse effects, such as toxic effects or irritations. The persed in anethole, menthol, eucalyptol, pumilius pine components of the carrier are powders, liquids, pasty essential oil and peppermint oil and mixed until obtain- substances which are usually employed in pharmaceu- 20 ing a homogeneous pasty mass which is subsequently tical, alimentary and dietetic preparations. distributed, under strong stirring for at least for 10 min- The composition consists of excipients in a percent- utes, into the melted mass kept at a temperature rang- age ranging from 30% to 99.9%. ing from 45° to 75°C. The active ingredients present in the formulations The compositions of the invention evidenced that, are of various nature (natural, synthetic, semisynthetic) 25 the active ingredient dosages being equal, a topical and are characterized by different therapeutical and effective concentration of medicament can be main- prophylactic uses in the various pathologies of the tained for a time substantially more prolonged than with pharyngo-oral cavity and of the periodontium (antibac- the conventional pharmaceutical forms, thereby terials, antimycotic and topical antiseptics) and they are decreasing the administrations and allowing a shorter present in the pharmaceutical form in concentrations of 30 treatment time.
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