NZ601713B - Solid pharmaceutical composition for buccal administration of agomelatine - Google Patents

Abstract

ABSTRACT - 601713 The disclosure relates to a solid buccal pharmaceutical composition intended for systemic action, which is a tablet to be sucked, a pastille to be sucked, a lozenge to be sucked, or a solid obtained by hot-melt extrusion or injection-moulding, comprising agomelatine or one of its hydrates, complexes, co-crystals, crystalline forms, addition salts with a pharmaceutically acceptable acid or base, and one or more excipients selected from diluents, binders, flow agents, lubricants, coating agents, plasticisers, flavourings, counter-irritants and sweeteners, characterised in that it makes it possible to obtain a release time of the active ingredient comprised between 3 and 30 minutes and an absolute bioavailability greater than 25%. These compositions have a slow erosion release of agomelatine and are suitable for the treatment of major depression, seasonal affective disorder, generalized anxiety disorder, obsessional compulsive disorder, bipolar disorders, sleep disorders, cardiovascular pathologies, pathologies of the digestive system, insomnia and fatigue due to jet-lag, appetite disorders and obesity, and any pathology associated with deregulation of circadian rhythms. s hydrates, complexes, co-crystals, crystalline forms, addition salts with a pharmaceutically acceptable acid or base, and one or more excipients selected from diluents, binders, flow agents, lubricants, coating agents, plasticisers, flavourings, counter-irritants and sweeteners, characterised in that it makes it possible to obtain a release time of the active ingredient comprised between 3 and 30 minutes and an absolute bioavailability greater than 25%. These compositions have a slow erosion release of agomelatine and are suitable for the treatment of major depression, seasonal affective disorder, generalized anxiety disorder, obsessional compulsive disorder, bipolar disorders, sleep disorders, cardiovascular pathologies, pathologies of the digestive system, insomnia and fatigue due to jet-lag, appetite disorders and obesity, and any pathology associated with deregulation of circadian rhythms.

Description

NEW ZEALAND PATENTS ACT, 1953 COMPLETE SPECIFICATION SOLID PHARMACEUTICAL ITION FOR BUCCAL ADMINISTRATION OF AGOMELATINE We, LES LABORATOIRES SERVIER, a French y of 35, rue de Verdun 92284, Suresnes Cedex, France, do hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to a new solid pharmaceutical form for administration of agomelatine by the buccal route.

Agomelatine, or N-[2-(7-methoxynaphthyl)ethyl]acetamide of formula (I): NHCOMe (I), and its hydrates, crystalline forms, complexes, co-cristals, and on salts with a pharmaceutically acceptable acid or base has le cological properties: it is a selective agonist of ors of the melatoninergic system and, on the other hand, an antagonist of the 5-HT2C receptor. These properties provide it with activity in the central nervous system and, more especially, in the ent of major depression, seasonal affective disorder, generalized anxiety disorder, obsessional compulsive disorder, bipolar ers, sleep ers, cardiovascular pathologies, pathologies of the digestive system, insomnia and fatigue due to jet-lag, appetite ers and obesity.

In one aspect, the invention provides a solid buccal pharmaceutical composition intended for systemic action, which is a tablet to be sucked, a pastille to be sucked, a e to be sucked, or a solid ed by hot-melt extrusion or injection-moulding, sing agomelatine or one of its hydrates, complexes, co-crystals, crystalline forms, addition salts with a pharmaceutically acceptable acid or base, and one or more excipients selected from diluents, binders, flow agents, lubricants, coating , plasticisers, flavourings, counterirritants and sweeteners, characterised in that it makes it possible to obtain a release time of the active ingredient comprised between 3 and 30 minutes and an absolute bioavailability greater than 25%.

The invention also provides a use of agomelatine or one of its hydrates, complexes, cocrystals , crystalline forms, addition salts with a pharmaceutically acceptable acid or base, and one or more excipients selected from diluents, binders, flow agents, lubricants, coating agents, plasticisers, flavourings, counter-irritants and sweeteners in the manufacture of a solid buccal pharmaceutical composition intended for systemic action, which is a tablet to be sucked, a pastille to be sucked, a lozenge to be sucked, or a solid obtained by hot-melt extrusion or injection-moulding, wherein the composition has a e time of the active ingredient comprised between 3 and 30 s and an absolute bioavailability r than 25%, n the pharmaceutical composition is for use in the treatment of major depression, seasonal affective disorder, generalized anxiety disorder, obsessional compulsive disorder, bipolar disorders, sleep disorders, cardiovascular pathologies, pathologies of the digestive system, insomnia and fatigue due to jet-lag, appetite disorders and obesity, and any pathology associated with deregulation of circadian rhythms.

Agomelatine, its crystalline forms, its complexes, its co-crystals, its addition salts with a pharmaceutically acceptable acid or base, its preparation and its use in therapeutics have been described, among others, in the patent applications EP0447285, WO2005/077887, WO2007/015003, WO2007/015002, WO2007/015004, WO2010/097052, WO2010/102554, 55440, WO2011/050742, CN102050756, WO2011/006387, WO2011/075943, CN101774937, CN101870662, CN102030673, WO2012/046253, /113362, WO2011/113363, CN102206864, 03886, and CN102432490.

In all that s hereinbelow, "agomelatine" is understood to mean agomelatine, its hydrates, its complexes, its co-crystals, its crystalline forms and its addition salts with a pharmaceutically acceptable acid or base.

The agomelatine may especially be in crystalline form II.

Agomelatine can be administered by the oral route or, more specifically, by the enteral route in the form of immediate-release tablets to be swallowed with half a glass of water.

These agomelatine tablets are , ally in treating major depression, seasonal affective disorder, generalized anxiety disorder, obsessional compulsive disorder, bipolar disorders, sleep ers, cardiovascular pathologies, pathologies of the digestive system, insomnia and fatigue due to jet-lag, appetite ers and obesity, and any ogy associated with deregulation of circadian rhythms.

Pharmacokinetic studies in humans have shown that the bioavailability of agomelatine by the oral route is low compared to the parenteral route and varies for one and the same individual and from one individual to another.

The low bioavailability of agomelatine and the variations in inter- and individual concentrations have therefore ed in the search for a new formulation allowing those drawbacks to be overcome. A solid orodispersible pharmaceutical composition of agomelatine, described in Patent ation EP1427724, was therefore developed, containing agomelatine and granules consisting of lactose and starch dried by isation and marketed under the name C. This pharmaceutical composition makes it possible to obtain tablets having a very good capacity for disintegrating in the oral cavity and, more specifically, in the sublingual cavity, meeting the ia for persibility. The orodispersible tablets make it possible to deliver the active ingredient into the oral cavity and, more specifically, into the sublingual cavity in less than three minutes. Dissolution of the active ient in the saliva and then absorption via the mucous membranes of the oral cavity and, more specifically, the sublingual mucous membrane, and rapid passage into the blood make it possible to avoid presystemic degradation and the c first-pass effect. Accordingly, bioavailability is very clearly improved with much lower variability and rapid appearance of the active ingredient in the blood.

However, it quickly became apparent that this formulation had a drawback due to the active ingredient used - agomelatine - which causes a pronounced sensation of irritation in the mucous nes of the oral cavity.

When the sublingual route is ically targeted, this stinging effect is exacerbated because of the high local concentrations of agomelatine, the end result of which is very poor patient ability. In this context, a formulation of the sublingual tablet type was developed and described in Patent Application WO2007/068829, meeting the requirements for orodispersibility and patient acceptability. The favoured strategy was to obtain a solid pharmaceutical composition composed of a central core or central layer containing agomelatine and excipients ng an orodispersible formulation to be obtained, and an orodispersible coating optionally containing a counter-irritant. These orodispersible tablets make it possible to obtain rapid egration in less than 3 minutes and have shown an excellent ability to limit the stinging character of the active ingredient.

The Applicant has now followed a new strategy consisting of ping a pharmaceutical ation ng gradual release of agomelatine in the buccal cavity. The important point of this new formulation is to maintain, throughout release of the active ingredient, local trations which are sufficiently low to limit the stinging sensation and to obtain a form able to the patient.

Accordingly, a new pharmaceutical formulation was developed, making it possible to remedy the problem of irritation by the agomelatine whilst favouring delivery of the active ient into the buccal cavity for the purpose of systemic action, that effect being sought in order to improve the problems of bioavailability and intra- and inter-individual variability with tablets administered by the oral route. In surprising and completely unexpected manner, this new formulation has resulted in an increase in the bioavailability of the active ingredient not only compared to the oral (enteral) tablet but also compared to the orodispersible oromucosal formulations ped in the prior art for the purpose of systemic , for ations having the same dosage in active principle and wherein the active principle has the same form. By “same form” it is understood, here and every time it will be used hereinafter, that the active principle has the same crystalline form, or is under the same hydrate, complexe, salt or co-crystal form, and that particle sizes of active principle are the same.

The present invention accordingly relates to a solid buccal preparation intended for systemic action, which makes possible lled release of the active ingredient in the oral cavity so as to obtain good acceptability in terms of taste and better absolute bioavailability compared to the orodispersible tablets having an oromucosal absorption described in the prior art, for formulations having the same dosage in active principle and wherein the active principle is under the same form.

The buccal preparation according to the invention relates more especially to es, pastilles to be sucked, s to be sucked, sublingual tablets, gingival tablets, solids obtained by hot-melt extrusion or injection-moulding or also medicament-containing spheres intended to dissolve in the oral cavity, which contain agomelatine.

The buccal preparation according to the invention may contain diluents, binders, flow agents, lubricants, coating agents, plasticisers, flavourings, counter-irritants and sweeteners.

The buccal preparation according to the invention is characterised by the absence of a disintegrant, which, combined with a high compression strength, makes it possible to provide a tablet which does not disintegrate but erodes slowly by dissolution of the constituents on the surface.

The systemic-action buccal preparation according to the invention has an active ingredient release time less than 30 s, and more preferably less than 15 minutes. The active ingredient release time will be for example between 3 minutes and 30 minutes, and more ably n 3 minutes and 15 minutes.

Lozenges and pastilles to be sucked are solid unit-dose preparations ed to be sucked and to dissolve or disintegrate slowly in the mouth. Lozenges to be sucked are hard preparations obtained by moulding. They n the active ingredient y in a flavoured and sugary excipient. They may optionally contain counter-irritants. les to be sucked are soft and malleable preparations obtained by ng mixtures containing gums or natural or synthetic polymers and sweeteners. They may optionally contain rings and counter-irritants.

Lozenges and pastilles to be sucked, in ance with the invention, will comprise, for e, agomelatine, gum arabic, mono- or di-saccharides such as glucose or sucrose, polysaccharides, isomalt, maltodextrin or polyols such as maltitol.

Tablets to be sucked are solid unit-dose preparations intended to be sucked in order to exert a local or systemic action. They are obtained by direct compression or by granulation followed by compression.

The ceutical composition according to the invention will be, for example, a tablet to be sucked which may be prepared by a direct compression process. The tablet to be sucked, in accordance with the invention, comprises agomelatine, a diluent and, optionally, a binding agent, a lubricating agent and/or a flow agent and/or one or more sweetening, flavouring or counter-irritation agents. It is characterised by slow n in the oral cavity.

The diluent that may be used in accordance with the invention is so selected that it allows use in direct compression and provides the pharmaceutical form with high resistance to crushing and able organoleptic properties for a buccal preparation to be sucked. The diluent used is ably a polyol or a saccharide (mono-, oligo- or poly-saccharide) or a combination of those various compounds such as, for example, glucose, sucrose, mannitol, dextrates or dextrin.

Among the binding agents that may be used in accordance with the invention there may be mentioned cellulose compounds and starch compounds, crospovidone and maltodextrin.

The counter-irritant optionally used is a compound acting on the vanilloid receptors or the ASIC (acid-sensitising ion channel) receptors responsible for sensations of irritation and pain. Preference is given to the counter-irritant used being citric acid.

The other ents used are excipients customarily described for each of the categories in reference works such as, for e, the Handbook of Pharmaceutical Excipients (Rowe, Sheskey and Owen, ceutical Press).

Among the ating agents that may be used in accordance with the invention there may be mentioned magnesium stearate, stearic acid, glycerol behenate, sters and sodium stearyl fumarate, more preferably magnesium stearate or sodium stearyl fumarate.

Among the sweeteners optionally envisaged according to the invention there may be mentioned aspartame, acesulfame potassium, sucralose and saccharin.

The flavourings optionally envisaged according to the invention may comprise any compound intended to have an effect relating to the taste descriptors (saltiness, sweetness, bitterness, sourness, .

Sublingual and gingival tablets are solid unit-dose preparations intended for ation h the tongue and in the gingivo-buccal space, respectively, for the purpose of systemic action. They are produced by compression of mixtures of s or granules so as to obtain s having a shape matched to their intended use.

Sublingual and gingival tablets according to the invention will comprise the same ingredients as tablets to be sucked. They have similar release es. They differ from tablets to be sucked only in their administration route. Tablets to be sucked are intended for administration via the oromucosal route, that is to say absorption of the active ingredient occurs via the entirety of the mucous membranes of the buccal cavity, whereas sublingual s are d specifically by the gual route, that is to say beneath the tongue, and gingival tablets specifically by the gingival route, that is to say via the gums.

The solids obtained by hot-melt extrusion or injection-moulding are prepared using the same ingredients as tablets to be sucked, but thermoplastic polymers are specifically added in order to provide the mixture of ingredients with flow properties in the hot state. Shaping of the solid is ed by extrusion through a die and then calendering and cooling or by injection of the material into a cooled mould. The thermoplastic polymers used in accordance with the invention are compounds customarily described in reference works such as, for example, the Polymer Handbook (Brandrup, Immergut and Grulke, Wiley- Interscience). There may be mentioned, for example, cellulose compounds, ethylenes, polyvinylpyrrolidones or polymethacrylates. Plasticising nds may optionally be used in order to facilitate flow and shaping of the material. Plasticisers used in accordance with the invention are plasticisers customarily described in reference works such as, for example, the Handbook of Pharmaceutical Excipients (Rowe, Sheskey and Owen, Pharmaceutical Press). There may be mentioned, for example, dibutyl sebacate, triacetin, glycerol, sorbitol and polyethylene s.

The solid buccal preparation intended for systemic action in accordance with the invention, after administration, has shown excellent active ingredient acceptability to the t. The formulation developed in ance with the invention does indeed allow gradual dissolution of the agomelatine, and therefore slow and controlled release, avoiding the introduction of an especially irritating very large amount of the active substance.

The Applicant has moreover carried out pharmacokinetic studies in humans and has been able to demonstrate, in entirely unexpected and surprising manner, much better bioavailability for a solid pharmaceutical ition for buccal administration according to the invention compared to the persible s described in the prior art, for ations having the same dosage in active ple, and wherein the active principle has the same form.

The pharmaceutical composition according to the invention has therefore made it possible to increase the bioavailability of the active ingredient very icantly and, as a consequence, to reduce intra- and inter-individual variability, whilst offering the patient a highly acceptable formulation.

The invention accordingly relates to a solid buccal ceutical ition comprising agomelatine, intended for systemic action, resulting in an increase in the bioavailability of the active ingredient compared especially to an orodispersible form administered by the sublingual or oromucosal route. More especially, the pharmaceutical composition according to the invention makes it possible to attain absolute bioavailability of the active ingredient of more than 25 %, and more preferably of more than 30 %, corresponding to an increase by a factor of close to 1.5 to 2 compared to the gual or oromucosal orodispersible formulations of the prior art, when formulations having the same dosage in active principle and wherein the active principle has the same form are compared.

The pharmaceutical compositions according to the invention are ably terised in that they contain, in relation to the total weight of the composition, from 0.01 % to 20 % agomelatine by weight, more especially from 0.01 % to 10 %, and even more preferably from 0.01 % to 5 %.

The pharmaceutical compositions according to the invention preferably comprise a t having a very good compression capability, whilst providing the formulation with an erodable character. Among the diluents according to the invention there may be mentioned rides and polyols, more preferably sucrose.

The useful dosage can be varied according to the nature and ty of the disorder, the administration route and the age and weight of the patient. The dosage varies from 0.1 mg to 25 mg of agomelatine per day in one or more administrations, and preferably from 0.1 mg to 10 mg of agomelatine per day in one or more administrations, and even more preferably from 0.1 mg to 5 mg of agomelatine per day in one or more administrations.

In this specification where reference has been made to patent specifications, other external documents, or other sources of information, this is generally for the purpose of ing a context for discussing the features of the invention. Unless specifically stated otherwise, nce to such external nts is not to be construed as an admission that such documents, or such sources of information, in any jurisdiction, are prior art, or form part of the common general knowledge in the art.

In the description in this specification reference may be made to t matter that is not within the scope of the claims of the current application. That subject matter should be readily identifiable by a person skilled in the art and may assist in putting into practice the invention as d in the claims of this ation.

The Examples that follow illustrate the invention but do not limit it in any way: EXAMPLE 11 Formulation :: TTaabblleett ttoo bbee ssuucckkeedd,, hhaavviinngg aa wweeiigghhtt ooff 550000 mmgg Constituents Amount (mg) Agomelatine 2 Sucrose for direct ssion 434.25 Pregelatinised maize starch 50 Aspartame 5 Acesulfame potassium 5 Magnesium stearate 3.75 The tablet to be sucked is prepared by mixing the constituents (with four premixing steps) followed by direct compression with a compression force of 30 kN and at a speed of ,000 tablets per hour. The tablets obtained have a hardness of 50 N.

Examples 2 and 3 are obtained in accordance with the same process: EXAMPLE 22 Formulation :: TTaabblleett ttoo bbee ssuucckkeedd,, iinngg aa wweeiigghhtt ooff 550000 mmgg Constituents Amount (mg) Agomelatine 0.5 Sucrose for direct compression 435.75 Pregelatinised maize starch 50 Aspartame 5 Acesulfame potassium 5 Magnesium stearate 3.75 EXAMPLE 33 Formulation :: TTaabblleett ttoo bbee ssuucckkeedd,, hhaavviinngg aa wweeiigghhtt ooff 550000 mmgg Constituents Amount (mg) Agomelatine 1 Sucrose for direct ssion 435.25 atinised maize starch 50 Aspartame 5 Acesulfame potassium 5 Magnesium stearate 3.75 EXAMPLE 44 Formulation :: iidd oobbttaaiinneedd bbyy iinnjjeeccttiioonn--mmoouullddiinngg Constituents Amount (mg) Agomelatine 2 Hydroxypropylcellulose 333 Mannitol 150 Aspartame 7.5 Acesulfame potassium 7.5 The solid is prepared by mixing the constituents. The mixture is then poured into a feed hopper for an Arburg S250 type injection-moulding press. The mixture is heated to 140°C by the five heating zones of the plasticising unit regulated incrementally from 95°C to 140°C and is injected at 1500 bar into a multi-cavity mould.

EXAMPLE 55 A single-administration pharmacokinetic test was d out in 12 y male volunteers. Three formulations - two orodispersible tablets and one tablet to be sucked - were tested. As the orodispersible ceutical formulations can be administered oromucosally (on top of the tongue) or gually, these two modes of administration were also considered and assessed. Accordingly, the 12 volunteers were alternatively given: - an orodispersible tablet having a central core co ntaining 2 mg of agomelatine, administered by sublingual application (central core containing 2 mg of agomelatine, 0.35 mg of magnesium stearate, 67.65 mg of Starlac; outer layer containing 236.25 mg of Starlac, 2.5 mg of acesulfame potassium, 2.5 mg of aspartame, 7.5 mg of citric acid and 1.25 mg of magnesium te); - a layer orodispersible tablet containing 2 mg of atine, administered by sublingual application (central core containing 2 mg of agomelatine, 0.35 mg of magnesium stearate, 67.65 mg of Starlac; 2 outer layers, each of 125 mg, containing 238.75 mg of Starlac, 2.5 mg of sucralose, 7.5 mg of citric acid and 1.25 mg of magnesium stearate); - a three-layer orodispersible tablet containing 2 mg of agomelatine, administered by oromucosal application; - a tablet to be sucked, according to the invention , containing 2 mg of agomelatine, administered in the buccal cavity t of Example 1).

Samples of plasma were taken immediately prior to treatment and then regularly from 2 minutes to 24 hours after administration of the tablet, and the following pharmacokinetic parameters were measured: Cmax (maximum concentration observed following administration) and AUC (absorption-elimination result for the active ingredient administered). The following results were obtained: Absolute Formulation Cmax (ng/ml) AUC (ng.h/ml) bioavailability Central core, orodispersible, 8.3 + 4.6 5.7 + 2.7 2 mg of agomelatine (7.8) (5.4) 19 % + 8.6 Sublingual administration Three-layer, orodispersible, 7.8 + 3.4 5.1 + 2.1 Prior 2 mg of agomelatine (7.5) (5.2) 17 % + 6.6 art gual administration Three-layer, orodispersible, 8.7 + 2.5 6.1 + 1.6 2 mg of agomelatine (8.7) (6.1) 20 % + 4.9 Oromucosal administration Example 1 Tablet to be sucked, 2 mg 16 + 4.9 11 + 2.8 of agomelatine (16.0) (11.0) 38 % + 8.9 Buccal administration The results obtained show that the formulation developed according to the present invention makes it possible to double the pharmacokinetic parameters obtained using the persible formulations previously described. The AUC, in direct correlation to the bioavailability, shows that this new formulation makes it possible to double the bioavailability obtained, compared to the orodispersible tablet.

EXAMPLE 66 A second single-administration pharmacokinetic test was d out in 12 y male volunteers. Four formulations - two orodispersible s and two s to be sucked - were tested. The orodispersible pharmaceutical formulations were administered sublingually. Accordingly, the 12 volunteers were alternatively given: - a tablet to be sucked, containing 0.5 mg of agome , administered in the buccal cavity t of Example 2); - a tablet to be sucked, containing 1 mg of agomela tine, stered in the buccal cavity (tablet of Example 3); - an orodispersible tablet having a central core co ntaining 0.5 mg of atine, stered by sublingual application (central core containing 0.5 mg of agomelatine, 0.35 mg of ium stearate, 69.15 mg of Starlac; outer layer containing 236.25 mg of Starlac , 2.5 mg of acesulfame potassium, 2.5 mg of aspartame, 7.5 mg of citric acid and 1.25 mg of magnesium stearate); - an orodispersible tablet having a central core co ntaining 1 mg of agomelatine, administered by sublingual application (central core containing 1 mg of agomelatine, 0.35 mg of magnesium stearate, 68.65 mg of Starlac; outer layer containing 236.25 mg of Starlac, 2.5 mg of acesulfame potassium, 2.5 mg of aspartame, 7.5 mg of citric acid and 1.25 mg of magnesium stearate).

Samples of plasma were taken immediately prior to treatment and then regularly from 2 minutes to 24 hours after stration of the tablet, and the following pharmacokinetic parameters were measured: Cmax (maximum concentration observed following stration) and AUC (absorption-elimination result for the active ingredient administered). The relative bioavailability blet ing to the invention / AUCorodispersible tablet from the prior art) was calculated for each individual and the s obtained were averaged. All the results obtained are set out in the following Table: Relative Formulation Cmax (ng/ml) AUC (ng.h/ml) bioavailability (Ftablet to be sucked / Forodispersible tablet) Prior Central core, orodispersible, 3.6 + 1.5 2.7 + 0.97 0.5 mg of agomelatine (3.2) (2.6) - art Sublingual administration Example 2 Tablet to be sucked, 0.5 mg 5.3 + 1.2 3.8 + 0.93 1.55 + 0.65 of agomelatine (5.1) (4.0) (1.38) Buccal administration Prior Central core, orodispersible, 6.1 + 2.6 4.3 + 1.9 1 mg of atine (5.9) (3.7) - art Sublingual administration Example 3 Tablet to be sucked, 1 mg 9.4 + 3.0 7.3 + 2.2 1.86 + 0.75 of agomelatine (9.0) (7.0) (1.54) Buccal administration The results ed show that the formulation developed ing to the present invention, at different dosages (0.5 and 1 mg of active ingredient), makes it possible to significantly increase the pharmacokinetic parameters compared to those obtained with the orodispersible formulations bed in the prior art at the same dosages, and wherein the active principle is under the same form. Accordingly, the relative bioavailability of the new formulation according to the invention, compared to the orodispersible formulation in the prior art, shows an improvement by a factor ranging from 1.5 to 1.8.

Claims (15)

WHAT WE CLAIM IS

1. Solid buccal pharmaceutical composition intended for systemic action, which is a tablet to be sucked, a pastille to be sucked, a lozenge to be sucked, or a solid obtained by 5 hot-melt extrusion or injection-moulding, comprising agomelatine or one of its hydrates, complexes, co-crystals, crystalline forms, addition salts with a pharmaceutically able acid or base, and one or more excipients selected from diluents, s, flow agents, ants, coating agents, plasticisers, flavourings, counter-irritants and sweeteners, characterised in that it makes it le to obtain a release time of the active ingredient 10 comprised between 3 and 30 minutes and an absolute bioavailability greater than 25%.

2. Solid buccal ceutical composition according to claim 1 characterised in that it makes it possible to obtain a release time of the active ingredient comprised between 3 and 30 minutes and a bioavailability greater than that obtained for an orodispersible tablet 15 with an oromucosal absorption ning the active principle agomelatine under the same form and at the same dosage.

3. Pharmaceutical composition according to claim 1 or 2, characterised in that it comprises a diluent having a very good compression lity and providing an erodable 20 character.

4. Pharmaceutical composition according to claim 3, characterised in that the diluent is a polyol or a saccharide. 25

5. Pharmaceutical composition according to one of claims 1 to 4, which is a tablet to be sucked.

6. Pharmaceutical composition according to one of claims 1 to 4, which is a lozenge to be .

7. Pharmaceutical composition according to one of claims 1 to 4, which is a solid obtained by hot-melt ion or injection-moulding.

8. Pharmaceutical composition according to one of claims 1 to 4, which is a pastille to be sucked.

9. Pharmaceutical composition according to one of claims 1 to8 , characterised in that 5 the active ingredient used in its preparation is ed in crystalline form II.

10. Pharmaceutical composition according to one of claims 1 to9 , characterised in that it comprises from 0.1 to 25 mg of agomelatine. 10

11. Pharmaceutical composition according to claim 1 to9 , characterised in that it comprises from 0.1 to 10 mg of agomelatine.

12. Pharmaceutical composition according to claim 1 to9 , characterised in that it comprises from 0.1 to 5 mg of agomelatine.

13. Pharmaceutical composition according to claim 1 to9 , characterised in that it comprises from 0.1 to 3 mg of agomelatine.

14. Pharmaceutical composition according to any one of claims 1 to13 , terised 20 in that it makes it possible to obtain an absolute bioavailability greater than 30 %.

15. Pharmaceutical composition according to any one of claims 1 to13 , characterised in that the relative bioavailability of the tablet to be sucked compared to an orodispersible tablet with an osal tion as defined in WO