Patent Grant
11052083
This disclosure relates to certain novel transmucosal and subcutaneous pharmaceutical formulations comprising substituted heterocycle fused gamma-carbolines, the manufacture of such formulations, and methods of use thereof, e.g., in the treatment of diseases or abnormal conditions involving or mediated by the 5-HT2A receptor, serotonin transporter (SERT), and/or dopamine D1/D2 receptor signaling pathways. The invention includes methods of treatment and/or prophylaxis of diseases and disorders including, but not limited to, anxiety, psychosis, schizophrenia, sleep disorders, sexual disorders, migraine, conditions associated with cephalic pain, social phobias, gastrointestinal disorders such as dysfunction of the gastrointestinal tract motility and obesity; depression (including major depressive disorder (MDD)) and mood disorders associated with psychosis or Parkinson's disease; psychosis such as schizophrenia associated with depression; bipolar disorder (e.g., bipolar depression); and other psychiatric and neurological conditions, as well as to combinations with other agents
1-(4-fluoro-phenyl)-4-((6bR,10aS)-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one (sometimes referred to as 4-((6bR,10aS)-3-methyl-2,3,6b,9,10,10a-hexahydro-1H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8(7H)-yl)-1-(4-fluorophenyl)-1-butanone, or as ITI-007), has the following structure:
The Compound of Formula I is a potent 5-HT2A receptor ligand (Ki=0.5 nM) with strong affinity for dopamine (DA) D2 receptors (Ki=32 nM) and the serotonin transporter (SERT) (Ki=26 nM, measured using 3H-imipramine binding displacement to human recombinant SERT), but negligible binding to receptors associated with cognitive and metabolic side effects of antipsychotic drugs (e.g., H1 histaminergic, 5-HT2C, and muscarinic receptors). This compound is currently in clinical trials, i.e., for the treatment of schizophrenia, bipolar disorder and dementia including Alzheimer's disease. The Compound of Formula I, and analogs thereof, salts thereof, and methods of treatment comprising such compounds, and methods of manufacturing such compounds, have been disclosed, e.g., in U.S. Pat. Nos. 6,548,493; 7,238,690; 6,552,017; 6,713,471; 7,183,282; RE39,680; RE39,679; U.S. Patent Publications 2004/209864, 2010/113781, 2011/071080, 2011/112105, 2013/0202692, 2015/0079172, 2017/0183350; and PCT Publication WO 2017/165843 and WO 2017/117514. The contents of each of these U.S. patents, U.S. patent Publications, and PCT Publications are hereby incorporated by reference in their entireties.
Deuterated variants of ITI-007 are generally disclosed in US 2017/0183350 and WO 2017/165843. The deuterated compounds are designed to slow or inhibit in vivo metabolism by substituted deuterium atoms for hydrogen atoms of ITI-007 at molecular positions which are the target of metabolic activity. The natural metabolites of ITI-007 are pharmacologically active, but with somewhat different receptor selectivity profiles. These deuterated derivatives can therefore provide modified pharmacokinetic profiles owing to altered rates or pathways of metabolism, as well as modified overall pharmacological profile due to shifting the balance between active parent species and active metabolite species.
One such deuterated compound is 1-(4-fluoro-phenyl)-4-((6bR,10aS)-2,2-d2-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one, the Compound of Formula II:
Another such deuterated compound is 1-(4-fluoro-phenyl)-4-((6bR,10aS)-1,1,2,2-d4-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one, the Compound of Formula III:
The Compounds of Formula I, II and Formula III each undergo significant first-pass metabolism in the liver. The high rate of metabolism requires the administration of higher oral doses of drug than would otherwise be needed, resulting in an increased burden on the liver, increased costs in manufacturing, difficulties in formulation and potentially higher patient-to-patient variability in dose response. There is therefore a need for new routes of administration that avoid first pass-metabolism, and which would result in correspondingly lower dosing requirements.
It has been disclosed that for a number of drugs transmucosal delivery, such as sublingual delivery, buccal delivery, and intranasal delivery, and subcutaneous delivery, are effective alternatives to traditional dosage forms such as parenteral and oral dosing. Parenteral (intravenous) dosing is very effective in avoiding first-pass metabolism, but is limited in its usefulness because it requires administration by trained professionals, usually in a clinical environment. In contrast, transmucosal delivery systems can be used to formulate drugs which can be taken by patients without professional supervision and can result in rapid drug absorption with minimal first-pass metabolism. Subcutaneous delivery similarly provides highly effective drug absorption with minimal first-pass metabolism, while also providing the potential for delayed or extended release (compared to IV administration).
The use of transmucosal drug delivery formulations is well known, with sublingual formulations of nitroglycerin dating back to 1847. These formulations involve the transfer of active drug agent across mucosal membranes, including the oral mucosa, nasal mucosa, and the vaginal mucosa. These mucosal surface are much more permeable to drugs than the skin (keratinized epithelium) and have similar permeability as the gastrointestinal mucosa, but without the problem that GI absorption of drugs results in immediate passage to the liver for metabolism. Oral mucosal delivery systems include buccal and sublingual systems.
Existing transmucosal delivery systems include rapidly-disintegrating tablets and wafers, thin, dissolvable films, aerosol sprays, dissolvable gels, as well as aqueous solutions. Examples of dissolvable film delivery systems include those disclosed in U.S. Pat. No. 4,136,145 to Fuchs, U.S. Pat. No. 4,849,246 to Schmidt, U.S. Pat. No. 5,629,003 to Horstmann, U.S. Pat. No. 5,948,430 to Zerbe, U.S. Pat. No. 9,108,340 to Yang, U.S. Pat. No. 8,906,277 to Yang, U.S. Pat. No. 8,900,498 to Yang, U.S. Pat. No. 8,900,497 to Yang, U.S. Pat. No. 8,652,378 to Yang, U.S. Pat. No. 8,603,514 to Yang, U.S. Pat. No. 9,427,412 to Bryson, and U.S. Pat. No. 8,414,922 to Bryson. Other transmucosal systems are disclosed in U.S. Pat. No. 5,763,476 to Delbressine (sublingual and buccal solutions and solids), U.S. Pat. No. 9,216,175 to Amancha (sublingual spray), U.S. Pat. No. 8,835,459 to Kottayil (sublingual spray), and U.S. Pat. No. 6,552,024 to Chen (various mucosal delivery systems). Some drugs, however, such as apomorphine, are found to be tolerated and effective in some transmucosal delivery forms, but not in others (see U.S. Pat. No. 9,427,412, describing lack of efficacy or tolerability for sublingual tablets and intranasal sprays, but not for sublingual films). In addition, individual formulations must be fine-tuned to particular active pharmaceutical ingredients to ensure reliability in delivery. Thus, while the field of transmucosal drug delivery has a long history, considerably effort is required in adapting any selected transmucosal delivery technology to a particular active pharmaceutical ingredient.
Subcutaneous injection is also well-known in the art, and is popularly used for the administration of insulin, morphine, methotrexate and many other drugs and vaccines. Subcutaneous injection is often performed by physicians and other medical personally using traditional syringes with small gauge needles, but there also exists many specialty devices for patient self-administration of subcutaneous injection, such as pre-filled syringes, auto-injectors, and wearable injectors. Such devices include the HumatroPen for insulin injection (Eli Lilly, Indianapolis, Ind., U.S.) and the Otrexup auto-injector for methotrexate injection (Antares Pharma, Ewing, N.J., U.S.).
There is a need for improved pharmaceutical delivery systems for the safe, effective, reliable delivery of the Compounds for Formula I and/or the Compound of Formula II. The present disclosure provides novel transmucosal and subcutaneous formulations for the delivery of these compounds without the drawbacks of existing parenteral and oral delivery systems.
The present disclosure is directed to novel transmucosal and subcutaneous pharmaceutical formulations comprising 1-(4-fluoro-phenyl)-4-((6bR,10aS)-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one, as well as deuterated variants thereof, in free base, co-crystal or salt forms. Transmucosal formulations include, but are not limited to, oral, nasal, and vaginal formulations in liquid, solid and/or aerosol forms, including, sublingual, buccal, intranasal and intravaginal tablets, wafers, films, sprays and gels.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
As used throughout, ranges are used as shorthand for describing each and every value that is within the range. Any value within the range can be selected as the terminus of the range. In addition, all references cited herein are hereby incorporated by referenced in their entireties. In the event of a conflict in a definition in the present disclosure and that of a cited reference, the present disclosure controls.
Unless otherwise specified, all percentages and amounts expressed herein and elsewhere in the specification should be understood to refer to percentages by weight. The amounts given are based on the active weight of the material in free base equivalent form.
In a first embodiment, the present disclosure provides a transmucosal pharmaceutical formulation (Formulation 1) comprising 1-(4-fluoro-phenyl)-4-((6bR,10aS)-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one (Compound of Formula I), in free base, co-crystal or salt form. The present disclosure further provides the following Formulations:
In a second embodiment, the present disclosure provides a transmucosal pharmaceutical formulation (Formulation 2) comprising 1-(4-fluoro-phenyl)-4-((6bR,10aS)-2,2-d2-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one (Compound of Formula II), in free base, co-crystal or salt form. The present disclosure further provides the following Formulations:
In a third embodiment, the present disclosure provides a subcutaneous pharmaceutical formulation (Formulation 3) comprising 1-(4-fluoro-phenyl)-4-((6bR,10aS)-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one (Compound of Formula I), in free base, co-crystal or salt form. The present disclosure further provides the following Formulations:
In a fourth embodiment, the present disclosure provides a subcutaneous pharmaceutical formulation (Formulation 4) comprising 1-(4-fluoro-phenyl)-4-((6bR,10aS)-2,2-d2-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one (Compound of Formula II), in free base, co-crystal or salt form. The present disclosure further provides the following Formulations:
In a fifth embodiment, the present disclosure provides a transmucosal pharmaceutical formulation (Formulation 5) comprising 1-(4-fluoro-phenyl)-4-((6bR,10aS)-1,1,2,2-d4-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one (Compound of Formula III), in free base, co-crystal or salt form. The present disclosure further provides the following Formulations:
In a sixth embodiment, the present disclosure provides a subcutaneous pharmaceutical formulation (Formulation 6) comprising 1-(4-fluoro-phenyl)-4-((6bR,10aS)-1,1,2,2-d4-3-methyl-2,3,6b,9,10,10a-hexahydro-1H,7H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxalin-8-yl)-butan-1-one (Compound of Formula III), in free base, co-crystal or salt form. The present disclosure further provides the following Formulations:
As used herein, “deuteration” refers to the substitution of a hydrogen (protium, 1H) atom in a chemical structure with a deuterium atom (2H). A hydrogen atom position of a structure is considered substituted with deuterium when the abundance of deuterium at that position is enriched. The natural abundance of deuterium is about 0.02%, so a compound is “enriched” with deuterium at a specific position when the frequency of incorporation of deuterium at that position exceeds 0.02%. Therefore, in any embodiment of a deuterated compound provided herein, any one or more hydrogen atoms may be enriched with deuterium at a level of greater than 0.1%, or greater than 0.5%, or greater than 1%, or greater than 5%, such as, greater than 50%, or greater than 60%, or greater than 70%, or greater than 80%, or greater than 90% or greater than 95%, or greater than 96%, or greater than 97%, or greater than 98%, or greater than 99%.
In all aspects and embodiments of the present disclosure comprising the Compound of Formula I, said Compound of Formula I may optionally be deuterated at one or more hydrogen atom positions.
In all aspects and embodiments of the present disclosure comprising the Compound of Formula II, said Compound of Formula II is enriched only at the designated positions (2,2-d2).
In all aspects and embodiments of the present disclosure comprising the Compound of Formula III, said Compound of Formula III is enriched only at the designated positions (1,1,2,2-d4).
In a second aspect, the present disclosure provides a process (Process 1) for the production of the transmucosal formulation of Formulation 1, et seq., or Formulation 2, et seq., or Formulation 5, et seq., comprising the steps of:
In a third aspect, the present disclosure provides a process (Process 2) for the production of the subcutaneous formulation of Formulation 3, et seq., or Formulation 4, et seq., or Formulation 6, et seq., comprising the steps of either:
The pharmaceutical formulations disclosed herein, e.g., Formulation 1, et seq., Formulation 2, et seq., Formulation 3, et seq., Formulation 4, et seq., Formulation 5, et seq., and Formulation 6, et seq., may comprise any suitable pharmaceutically acceptable excipients, including but not limited to: diluents such as starches, pregelatinized starches, lactose, powdered celluloses, microcrystalline celluloses, dicalcium phosphate, tricalcium phosphate, mannitol, sorbitol, xylitol, sugar and the like; binders such as acacia, guar gum, gum tragacanth, gelatin, polyvinylpyrrolidones such as polyvinylpyrrolidones (PVP K-30,K-90), poly (vinyl pyrrolidone-co-vinyl acetate) (PVP-VA) and the like, hydroxypropyl celluloses, hydroxypropyl methylcellulose, cellulose acetate, hydroxypropyl methylcellulose acetate succinate (HPMC-AS) and the like; disintegrants such as starches, sodium starch glycolate, pregelatinized starches, crospovidones, croscarmellose sodium and the like; lubricants such as stearic acid, magnesium stearate, zinc stearate and the like; glidants such as colloidal silicon dioxide and the like; solubility or wetting enhancers such as anionic or cationic or neutral surfactants; maltodextrin, complex forming agents such as various grades of cyclodextrins and resins; release rate controlling agents such as hydroxypropyl celluloses, hydroxymethyl celluloses, hydroxypropyl methylcelluloses, ethylcelluloses, methylcelluloses, various grades of methyl methacrylates, waxes and the like; and film formers, plasticizers, colorants, flavoring agents, sweeteners, viscosity enhancers, preservatives, antioxidants, buffering agents, bulking agents, and the like.
In some embodiments, the formulations may further comprise one or more anti-oxidants, for example, tocopherol, butylated hydroxytoluene (BHT), propyl gallate (OPG), or and ascorbic acid, or the like. The inclusion of an anti-oxidant may further improve the chemical stability of the formulations by preventing oxidative chemical degradation of the active ingredient.
In another aspect, the present disclosure provides Formulation 1, et seq., Formulation 2, et seq., Formulation 3, et seq., Formulation 4, et seq., Formulation 5, et seq., or Formulation 6, et seq., for use in treating a disease or abnormal condition involving or mediated by the 5-HT2A receptor, serotonin transporter (SERT), and/or dopamine D1/D2 receptor signaling pathways, e.g., a disorder selected from obesity, anorexia, bulimia, depression (including major depressive disorder (MDD)), anxiety, psychosis, schizophrenia, obsessive-compulsive disorder, sexual disorders, migraine, attention deficit disorder, attention deficit hyperactivity disorder, sleep disorders, conditions associated with cephalic pain, social phobias, dementia (including Alzheimer's Disease and Parkinson's dementia), gastrointestinal disorders such as dysfunction of gastrointestinal tract motility and obesity, or bipolar disorder (e.g., bipolar depression).
In another embodiment, the invention provides a method (Method 1) for the prophylaxis or treatment of a disease or abnormal condition involving or mediated by the 5-HT2A receptor, serotonin transporter (SERT), and/or dopamine D1/D2 receptor signaling pathways, in a patient in need thereof, comprising administering to the patient by a transmucosal or subcutaneous route, a therapeutically effective amount of the Compound of Formula I and/or the Compound of Formula II and/or the Compound of Formula III. Further embodiments of Method 1 include:
A Compound of Formula I or a Compound of Formula II and/or a Compound of Formula III, for use in Method 1 or any of Method 1.1 et seq.
A pharmaceutical composition selected from any of Formulation 1, et seq., Formulation 2, et seq., Formulation 3, et seq., Formulation 4, et seq., Formulation 5, et seq., or Formulation 6, et seq., for use in Method 1 or any of Method 1.1 et seq.
Use of a Compound of Formula I or a Compound of Formula II or a Compound of Formula III in the manufacture of a medicament for transmucosal or subcutaneous administration, e.g., a medicament in accordance with any of Formulation 1, et seq., Formulation 2, et seq., Formulation 3, et seq., Formulation 4, et seq., Formulation 5, et seq., or Formulation 6, et seq., for use in a method of treatment according to Method 1 or any of Method 1.1 et seq.
Methods of synthesizing the Compounds of Formula I and the Compounds of Formula II are known in art, and include the methods disclosed in WO PCT/US08/03340 (WO 2008/112280); U.S. application Ser. No. 10/786,935; U.S. Pat. Nos. 6,548,493; 7,238,690; 6,552,017; 6,713,471; 7,183,282; U.S. RE39680, and U.S. RE39679, and WO 2015/154025, the contents of each of which are incorporated by reference in their entirety. Salts of the Compounds of the Invention may also be prepared as similarly described in U.S. Pat. Nos. 6,548,493; 7,238,690; 6,552,017; 6,713,471; 7,183,282; U.S. RE39680; U.S. RE39679; and WO 2009/114181, the contents of each of which are incorporated by reference in their entirety.
Isolation or purification of the diastereomers of the Compounds of the Invention may be achieved by conventional methods known in the art, e.g., column purification, preparative thin layer chromatography, preparative HPLC, crystallization, trituration, simulated moving beds and the like.
The pharmaceutically acceptable salts of the Compounds of Formula I, II and III can be synthesized from the parent compound which contains a basic or acidic moiety by conventional chemical methods. Generally, such salts can be prepared by reacting the free base forms of these compounds with a stoichiometric amount of the appropriate acid in water or in an organic solvent, or in a mixture of the two; generally, non-aqueous media like ether, ethyl acetate, ethanol, isopropanol, or acetonitrile are preferred. Further details for the preparation of these salts, e.g., toluenesulfonic salt in amorphous or crystal form, may be found in PCT/US08/03340 and/or U.S. Provisional Appl. No. 61/036,069.
Transmucosal dosage forms are known to those skilled in the art, and general procedures by which these dosage forms can be prepared have been described. Examples of dissolvable film delivery systems include those disclosed in U.S. Pat. No. 4,136,145 to Fuchs, U.S. Pat. No. 4,849,246 to Schmidt, U.S. Pat. No. 5,629,003 to Horstmann, U.S. Pat. No. 5,948,430 to Zerbe, U.S. Pat. No. 9,108,340 to Yang, U.S. Pat. No. 8,906,277 to Yang, U.S. Pat. No. 8,900,498 to Yang, U.S. Pat. No. 8,900,497 to Yang, U.S. Pat. No. 8,652,378 to Yang, U.S. Pat. No. 8,603,514 to Yang, U.S. Pat. No. 9,427,412 to Bryson, and U.S. Pat. No. 8,414,922 to Bryson. The preparation of other transmucosal systems are disclosed in U.S. Pat. No. 5,763,476 to Delbressine (sublingual and buccal solutions and solids), U.S. Pat. No. 9,216,175 to Amancha (sublingual spray), U.S. Pat. No. 8,835,459 to Kottayil (sublingual spray), and U.S. Pat. No. 6,552,024 to Chen (various mucosal delivery systems). The contents of each of these references is incorporated by reference herein in their entireties.
In vivo absorption and distribution of the Compound of Formula I and the Compound of Formula II, both in their tosylate salt forms, is compared between subcutaneous and sublingual administration in non-cross over sequential studies in dogs.
SC Administration: Six male beagle dogs between 2 and 5 years of age are randomized in two groups of three dogs each. Dogs in group 1 are administered the Compound of Formula I at a dose of 1 mg/kg (free base equivalent) in a 0.5% methylcellulose/distilled water vehicle. Dogs in group 2 are administered the Compound of Formula II at a dose of 1 mg/kg (free base equivalent) in a 0.5% methylcellulose/distilled water vehicle. Administration is subcutaneous in the intrascapular region via a 22 or 23 gauge needle. Whole blood samples are collected via the dog's cephalic vein pre-dose, and at post-dose time-points 5, 15 and 30 minutes, 1, 2, 4, 6, 8 and 24 hours. Following a minimum 7-day washout period, the dogs are transferred to the sublingual portion of the study.
SL Administration: The dogs of group 1 are administered the Compound of Formula I at a dose of 1 mg/kg (free base equivalent) in a 0.5% methylcellulose/distilled water vehicle. Dogs in group 2 are administered the Compound of Formula II at a dose of 1 mg/kg (free base equivalent) in a 0.5% methylcellulose/distilled water vehicle. The animals are anesthetized prior to administration of the dose using propofol (6 mg/kg) and anesthesia is maintained for 30 minutes using 3-4.5% isoflurane. Administration is sublingual and the dosage is applied for 30 minutes, then wiped off using unwoven gauze. Whole blood samples are collected via the dog's cephalic vein pre-dose, and at post-dose time-points 5, 15 and 30 minutes, 1, 2, 4, 6, 8, 24, 36 and 48 hours.
All blood samples are processed to plasma and analyzed for drug concentrations using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Area under the curve (AUC) of parent and metabolites based on plasma versus time data are calculated using Prism 5.04 software (GraphPad Software, Inc.).
The results are summarized in Table 1A below (AUC is shown for 0-24 hours):
The results demonstrate that both SC and SL dosing results in high plasma concentration and high plasma AUC. SL dosing also results in significantly higher maximal plasma concentration of drug (Cmax) compared to SC dosing for both compounds. For the Compound of Formula II, SL dosing also results in a significantly higher overall AUC, while the AUC for the Compound of Formula I shows comparable AUC between SC and SL dosing. Time to maximum plasma concentration is also the same between SC and SL dosing for both compounds.
A second study is performed substantially as described for Example 1A, except that plasma samples are analyzed for the parent (administered) compounds, as well as for the major known metabolites. After administration of either the Compound of Formula I or the Compound of Formula II, the major circulating species are found to be the parent and the N-desmethyl metabolite. The results are summarized in Table 1B below (AUC is shown for 0-24 hours):
These results further demonstrate that both SC and SL dosing results in high plasma concentration and high plasma AUC for the administered compounds. SL dosing also results in higher maximal plasma concentration of drug (Cmax) compared to SC dosing for both compounds. In addition, the results show that both SC and SL dosing results in very low rates of metabolite formation, indicating that these routes effectively bypass the primary site of metabolic degradation of these compounds (hepatic metabolism). The Compound of Formula I circulated in plasma at an AUC approximately 22 times higher for parent than metabolite after SL dosing, and 27 times higher for SC dosing. In contrast, when administered orally, it has been found that the Compound of Formula I and its desmethyl metabolite circulate in plasma with AUC's of about 1:1 or less. Similarly, results are shown for the Compound of Formula II (parent/metabolite ratio of about 12 for SL and about 16 for SC).
In contrast to the subcutaneous and sublingual pharmacokinetics presented in Example 1, this Example demonstrates that oral administration results in substantially lower systemic exposure to drug, due to the high extent of hepatic first-pass metabolism. This is true even using doses from 2.5 times to 15 times higher than the dose used in the SC and SL study.
As part of a larger long-term toxicology study, 20 male and female beagle dogs are administered either control, or the Compound of Formula I, tosylate salt form, at a dose of 2.5, 5, 10, or 15 mg/kg. For control, the dogs are administered empty capsules. For the Compound of Formula I, the dogs are administered normal-release oral capsules. Blood samples are obtained at 0.25 hours, 0.5 hours, 1 hour, 4 hours, 8 hour and 24 hours. The blood samples are processed to plasma and analyzed for concentration of the Compound of Formula I by high-performance liquid chromatography-mass spectrometry. Cmax, Tmax and area-under-the-curve (AUC, 0-24 hours) are calculated using Phoenix WinNonlin software. The results are shown in Table 1 below:
The Compound of Formula I shows dose-dependent oral absorption, and that the plasma concentration achieved with even the highest-oral dose is far below the plasma concentration and AUC achieved from sublingual and subcutaneous administration as shown in Example 1. Sublingual and subcutaneous dosing of the Compound of Formula I at only 1.0 mg/kg results in 24-hour AUC that is more than 18× higher than oral dosing at 2.5 mg/kg. Sublingual and subcutaneous doing even provide 24-hour AUC about three times higher at 1.0 mg/kg than oral dosing at 15 mg/kg.
These results taken together clearly demonstrate the large loss in exposure resulting from hepatic first pass metabolism, and the unexpectedly high improvement in exposures that are achieved from using transmucosal dosing systems.
A study is also performed in monkeys to determine the plasma concentrations of both the Compound of Formula I and its major metabolites after both SL and SC dosing at 0.5 mg/kg. Six Cynomolgus monkeys are divided into two groups for IV and SC dosing with the Compound of Formula I. The animals are dosed in a fasting state. Blood samples are collected pre-dose, and at 5 minutes, 15 minutes, 1, 2, 4, 6, 8, 24, 36 and 48 hours post-dose. All blood samples are processed to plasma and later analyzed by liquid chromatography-tandem mass spectrometry. Samples are tested for the concentration of the Compound of Formula I, as well as for its five major known metabolites. PK parameters are calculated using PK Solutions 2.0 software (Summit Research Services, Colorado, US).
The results show that bioavailability (based on a comparison of IV to SC pharmacokinetics) is about 74% for the Compound of Formula I or SC administration. Most tested metabolites are found to present at levels below the limit of quantitation. Only the des-methyl metabolite and the amide metabolite (oxidation of the methylene adjacent to the N-methyl group to a carbonyl) are found to be present in significant concentration. The concentrations of both metabolites are found to be lower after SC dosing than after IV dosing. The results are shown in Table 3 below:
The results show that SC administration in monkeys results in substantially lower levels of formation of the major metabolites compared to IV administration.
This application is a U.S. continuation application of U.S. application Ser. No. 15/934,860, filed on Mar. 23, 2018, now U.S. Pat. No. 10,716,786, which claims priority to U.S. Provisional Application 62/476,538, filed on Mar. 24, 2017, the contents of each of which are herein incorporated by reference in their entireties.
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| Number | Date | Country | |
|---|---|---|---|
| 20200375988 A1 | Dec 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62476538 | Mar 2017 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 15934860 | Mar 2018 | US |
| Child | 16900746 | US |
