DAPTOMYCIN FORMULATIONS AND USES THEREOF

Description

FIELD

[0001] The presently disclosed subject matter relates to lyophilized daptomycin formulations having improved reconstitution times and methods of preparing thereof. The presently disclosed subject matter also relates to lyophilized daptomycin formulations for use in methods of treating a bacterial infection in a subject.BACKGROUND

[0002] Daptomycin (I) is a cyclic lipopeptide derived from a natural product of Streptomyces roseosporus. The daptomycin comprises an asparagine (Asn) residue in the D configuration. Daptomycin has been used for treating complicated skin and skin structure infections (cSSSI) caused by susceptible isolates of the following gram-positive bacteria: Staphylococcus aureus (including methicillin-resistant isolates), Streptococcus pyogenes, Streptococcus agalactiae, Streptococcus dysgalactiae subsp. equisimilis, and Enterococcus faecalis (vancomycin-susceptible isolates only).

[0003] Daptomycin has also been used for treating Staphylococcus aureus bloodstream infections (bacteremia), including those with right-sided infective endocarditis, caused by methicillin-susceptible and methicillin-resistant isolates. Daptomycin's bactericidal effects stem from its ability to rapidly depolarize the membrane potential of gram-positive bacteria, which causes inhibition of DNA, RNA and protein synthesis, and results in cell death. The bactericidal effect of daptomycin is rapid, with greater than 99.9% of both MRSA and MSSA bacteria dead in less than one hour.

[0004] Daptomycin has also been used for biofilm treatment including catheter-related bloodstream infections (CRBSI) due to gram-positive bacteria. Particularly, daptomycin may be used for central venous catheter salvage for S.aureus and S.epidermidis infected catheters.

[0005] Daptomycin is commercially available as CUBICIN ®< ("the CUBICIN ®< product", Cubist Pharmaceuticals, Inc., Lexington, MA) and is supplied as a sterile, lyophilized powder. CUBICIN ®< is reconstituted in sodium chloride for parenteral injection. Stability studies have shown that the reconstituted solution is stable in a vial for 12 hours at room temperature and up to 48 hours if stored under refrigeration at 2 to 8°C. However, after this time, or at higher temperatures, daptomycin begins to degrade.

[0006] A major shortcoming of the commercially available daptomycin is that the reconstitution time of the CUBICIN ®< product is long and is typically in the range of about 15 to 45 minutes depending on the reconstitution procedure. This reconstitution time is not ideal in a therapeutic setting with respect to ease and efficiency of administration. Such long reconstitution time also increases the risk of inadvertent incomplete dissolution prior to administration and additionally increases the likelihood that the daptomycin will degrade prior to patient administration.

[0007] There are a number of daptomycin degradation products that have been identified. The major degradants of daptomycin are anhydro-daptomycin derivatives in which an α-aspartyl group is transpeptidated to an anhydrosuccinamido group, β-isomer of daptomycin in which the compound contains a β-aspartyl group instead of an α-aspartyl group and the lactone hydrolysis product of daptomycin in which one of the esters moieties is hydrolysed. The degradation pathway of daptomycin is described in U.S. Patent Publication No. 2007 / 191280.

[0008] High performance liquid chromatography (HPLC) of the reconstituted lyophilized powder can be used to determine the level of daptomycin relative to daptomycin degradants. Such comparison can thereby provide an indication of the stability of the daptomycin in the formulation. For example, International Patent Publication No. WO2011 / 063419 discloses solid daptomycin preparations with improved reconstitution times and stability profiles relative to the CUBICIN ®< product. This is achieved when sugars, such as sucrose, and a phosphate buffer are introduced into the formulation. The formulations have a pH of about 6.5 to about 7.5. The sugars used can be non-reducing sugars and are included in the formulations in an amount of about 2.5% w / v to about 25% w / v. For example, the sugars are included in amounts of 15% w / v and 20% w / v.

[0009] There is still a need for alternative solid lyophilized daptomycin formulations that exhibit rapid reconstitution times, preferably in less than about 5 minutes, in a pharmaceutically accepted diluent. Additionally, there still remains need for solid daptomycin formulations that exhibit rapid reconstitution times and have improved stability in both solid and reconstituted forms. Such a solid formulation would be advantageous, as it would provide for a longer shelf life, a lessened requirement for refrigerated storage and a reduced handling time in reconstitution of the product before use. Such a formulation would also provide for more rapid administration and a more reliable dosing of daptomycin due to the presence of fewer impurities resulting from daptomycin degradation.

[0010] CN 1 616 083 discloses a lyophilized daptomycin formulation comprising daptomycin, dextran, citric acid and sodium hydrogen carbonate.

[0011] WO 2011 / 063419 discloses solid daptomycin formulations which are said to have improved chemical stability and faster reconstitution times. An example is a formulation comprising daptomycin and sucrose.SUMMARY

[0012] The presently disclosed subject matter provides a lyophilized daptomycin formulation comprising from 200mg to 600mg of daptomycin and the additive citric acid which, upon reconstitution in a pharmaceutically acceptable diluent, leads to a daptomycin concentration of from 20mg / mL to 100mg / mL and a citric acid concentration of from 25mM to 75nM.

[0013] The lyophilized daptomycin formulation can be reconstituted in a pharmaceutically acceptable diluent. In one embodiment, the lyophilized daptomycin formulation is reconstituted in a pharmaceutically acceptable diluent in less than about 5 minutes.

[0014] The pH of the reconstituted lyophilized daptomycin formulation can be from about 4.0 to about 5.0. In one embodiment, the pH of the reconstituted lyophilized daptomycin formulation is about 4.7.

[0015] The diluent can be selected from the group consisting of sterile water for injection, bacteriostatic water for injection, 0.45% sodium chloride solution for injection, 0.9% sodium chloride solution for injection, Ringer's solution, lactated Ringer's solution, and combinations thereof. In one embodiment, the diluent is 0.9% sterile sodium chloride solution for injection. In another embodiment, the diluent is sterile water for injection.

[0016] The presently disclosed subject matter also provides a lyophilized daptomycin formulation for use in a method of treating a bacterial infection in a subject. The method includes administering to a subject in need thereof, an effective amount of the above-disclosed lyophilized daptomycin formulation.

[0017] The presently disclosed subject matter further provides methods for preparing lyophilized daptomycin formulations. In one embodiment, the method includes (a) forming an aqueous solution of daptomycin and citric acid; (b) adjusting the pH to about 4.0 to about 5.0; and (c) lyophilising the solution to obtain a lyophilisate. In another embodiment, the method includes (a) forming an aqueous solution of daptomycin at a pH of about 4.0 to about 5.0; (b) dissolving citric acid in the aqueous solution of the daptomycin; (c) adjusting the pH to about 4.0 to about 5.0; and (d) lyophilising the solution to obtain a powder.DETAILED DESCRIPTION Definitions

[0018] The term "about" or "approximately" means within an acceptable error range for the particular value as determined by one of ordinary skill in the art, which will depend in part on how the value is measured or determined, i.e., the limitations of the measurement system. For example, "about" can mean within 3 or more than 3 standard deviations, per the practice in the art. Alternatively, "about" can mean a range of up to 20%, preferably up to 10%, more preferably up to 5%, and more preferably still up to 1% of a given value. Alternatively, particularly with respect to biological systems or processes, the term can mean within an order of magnitude, preferably within 5-fold, and more preferably within 2-fold, of a value.

[0019] As used herein, the term "osmolality" of a solution means the number of osmoles of solute per kilogram of solvent. Osmolality is a measure of the osmotic pressure exerted by a real solution across a semi-permeable membrane. It can be measured by use of a property of the solution that is dependent only on the particle concentration. These properties include vapour pressure depression, freezing point and boiling point depression, osmotic pressure collectively referred to as colligative properties. The osmolality of a solution is typically determined most accurately and conveniently by measuring freezing point depression.

[0020] As used herein, the term "lyophilized" means a stabilizing process used to remove a solvent from tissue, blood, serum, pharmaceutical formulations, or other biological substances; at low temperatures through a process of sublimation (primary drying) and then desorption (secondary drying). A lyophilized formulation can be reconstituted in a simple manner to give a ready-to-use solution which contains no visible particles by addition of a diluent.Lyophilized Daptomycin Formulations

[0021] The presently disclosed subject matter provides a lyophilized daptomycin formulation including citric acid.

[0022] The lyophilized daptomycin formulation of the presently disclosed subject matter displays rapid reconstitution times in a pharmaceutically acceptable diluent. Furthermore, the inclusion of citric acid in the daptomycin formulations does not adversely affect the stability of the formulations with respect to the CUBICIN ®< product. The lyophilized daptomycin formulations of the presently disclosed subject matter display good pharmaceutical elegance and upon reconstitution display minimal foaming. The presence of foaming upon reconstitution can be problematic with daptomycin solutions due to its amphiphilic properties, particularly in a clinical setting wherein foaming of the formulation affects the reconstitution time, the homogeneity of the reconstituted solution, as well as the ease and accuracy of delivering the formulation to a patient. The lyophilized daptomycin formulations of the presently disclosed subject matter thereby allow for simple and rapid reconstitution and provide daptomycin solution formulations with improved homogeneity that can be more easily and precisely delivered to a patient.Additives

[0023] The additive suitable for use in the formulations of the presently disclosed subject matter is citric acid.Daptomycin

[0024] The CUBICIN ®< product includes 250, 350 or 500 mg of daptomycin. The lyophilized daptomycin formulations of the presently disclosed subject matter include from 200 mg to 600 mg of daptomycin. In some embodiments, the lyophilized daptomycin formulations include from 200 mg to 300 mg of daptomycin. In one embodiment, the lyophilized daptomycin formulations include 250 mg of daptomycin. In some embodiments, the lyophilized daptomycin formulations include from 300 mg to 400 mg of daptomycin. In one embodiment, the lyophilized daptomycin formulations include 350 mg of daptomycin. In certain embodiments, the lyophilized daptomycin formulations include from 450 mg to 550 mg of daptomycin. In one embodiment, the lyophilized daptomycin formulations include 500 mg of daptomycin.Optional Components

[0025] Further optional components can be included in the lyophilized daptomycin formulations. Such optional components include, but are not limited to, buffering agents, stabilisers, solubilisers, crystallisation inhibitors, surfactants and tonicifying agents.

[0026] The lyophilized daptomycin formulations of the presently disclosed subject matter can optionally include one or more buffering agents. Suitable buffering agents include, but are not limited to, phosphate buffers, sulfonic acids and Tris buffers. Specific buffers include sodium or potassium salts of phosphoric acid (such as disodium hydrogen phosphate), 2-{N-morpholino)ethanesulfonic acid (MES), N-[tris(hydroxymethyl)methyl]-2-ammoethanesulfonic acid (TES), N-(2-hydroxyethyl)piperazine-N'-(2-ethanesulfonic acid) (HEPES), 3-(N,N-Bis[2-hydroxyethl]amino)-2-hydroxypropanesulfonic acid (DIPSO), 2-hydroxy-3-[trishydroxymethyl)methylamine}-1-propanesulfonic acid (TAPSO), N-(2-acetamido)2-amino ethanesulfonic acid (ACES), 1,4-piperazinediethanesulfonic acid (PIPES), 3-(N-morpholino)propanesulfonic acid (MOPS), β-hydroxy-4-morpholinepropanesulfonic acid (MOPSO), N-(2-acetamido)-iminodiacetic acid (ADA) and 2-bis(2-hydroxyethyl)amino-2-(hydroxymethyl)-1,3-propanediol (BIS-TRIS). The buffering agent can be added in an amount of about 0.01 mM to about 500 mM to the lyophilized daptomycin formulations.

[0027] The lyophilized daptomycin formulations of the presently disclosed subject matter can optionally include one or more stabilisers. Suitable stabilising agents include, but are not limited to, sugars (such as sucrose, trehalose and dextran), amino acids (such as arginine, glycine and histidine), polyvinylpyrrolidones (povidone) and polyols (such as mannitol and polymeric polyol surfactants, e.g., Pluronic ®< .Reconstitution of Lyophilized Daptomycin Formulations

[0028] The lyophilized daptomycin formulations of the presently disclosed subject matter display rapid reconstitution times in a pharmaceutically acceptable diluent. In one embodiment, the lyophilized daptomycin formulations are reconstituted in a pharmaceutically acceptable diluent in less than about 5 minutes. In one embodiment, the lyophilized daptomycin formulations are reconstituted in a pharmaceutically acceptable diluent in less than about 4 minutes. In one embodiment, the lyophilized daptomycin formulations are reconstituted in a pharmaceutically acceptable diluent in less than about 3 minutes. In another embodiment, the lyophilized daptomycin formulations are reconstituted in a pharmaceutically acceptable diluent in less than about 2 minutes. In yet another embodiment, the lyophilized daptomycin formulations are reconstituted in a pharmaceutically acceptable diluent in less than about 1 minute. The lyophilized daptomycin formulations of the presently disclosed subject matter have improved reconstitution times compared to the CUBICIN ®< product.

[0029] The CUBICIN ®< product is reconstituted in 0.9% sterile sodium chloride for injection. The lyophilized daptomycin formulations of the presently disclosed subject matter can be reconstituted with one or more pharmaceutically acceptable diluents to provide a solution suitable for administration.

[0030] Pharmaceutically acceptable diluents of the presently disclosed subject matter include, but are not limited to, sterile water for injection, bacteriostatic water for injection, 0.45% sodium chloride solution for injection and 0.9% sodium chloride solution for injection, Ringer's solution and lactated Ringer's solution. In one embodiment, the lyophilized daptomycin formulations are reconstituted in 0.9% sterile sodium chloride solution for injection. In another embodiment, the lyophilized daptomycin formulations are reconstituted in sterile water for injection.

[0031] The lyophilized daptomycin formulations of the presently disclosed subject matter can be reconstituted by adding the pharmaceutically acceptable diluent(s) to the lyophilized daptomycin formulation to provide the desired concentration for direct administration or further dilution for administration by infusion. In some embodiments, the volume of the pharmaceutically acceptable diluent(s) added to the lyophilized daptomycin formulation is from about 5 mL to about 15 mL. In some embodiments, the volume of the pharmaceutically acceptable diluent(s) added to the lyophilized daptomycin formulation is from about 8 mL to about 12 mL. In one embodiment, the volume of the pharmaceutically acceptable diluent(s) added to the lyophilized daptomycin formulation is about 10 mL.

[0032] The lyophilized daptomycin formulations of the presently disclosed subject matter can be reconstituted by any suitable methods known to one of ordinary skill in the art. In one embodiment, 10 mL of 0.9% sterile sodium chloride for injection is added slowly to a vial including 500 mg of the lyophilized daptomycin formulation of the presently disclosed subject matter. The resultant mixture is rotated to ensure all of the formulation is wetted and then allowed to stand undisturbed for about 2 minutes. The vial is then gently rotated or swirled intermittently as needed, to obtain a completely reconstituted solution. Additionally and alternatively, the reconstitution method includes quickly adding a diluent to a vessel including a lyophilized daptomycin formulation of the presently disclosed subject matter, followed by swirling of the vessel if required. In some embodiments, the diluent is added in a period of about 1-60 seconds. In some embodiments, the diluent is added in a period of about 1-30 seconds. In one embodiment, the diluent is added in less than about 20 seconds. In one embodiment, after adding the diluent to the presently disclosed daptomycin formulation, the vessel including the daptomycin is swirled for about 1 minute and allowed to stand for about 3-5 minutes until clear.

[0033] Upon reconstitution in a pharmaceutically acceptable diluent, the CUBICIN ®< product includes 50 mg / mL daptomycin. Upon reconstitution in a pharmaceutically acceptable diluent, when provided in a vial, the daptomycin formulations of the presently disclosed subject matter include daptomycin at a concentration of from 20 mg / mL to 100 mg / mL, e.g., from 20 mg / mL to 30 mg / mL, from 30 mg / mL to 40 mg / mL, from 40 mg / mL to 50 mg / mL, from 50 mg / mL to 60 mg / mL, from 60 mg / mL to 70 mg / mL, from 70 mg / mL to 80 mg / mL, from 80 mg / mL to 90 mg / mL, or from 90 mg / mL to 100 mg / mL. In one embodiment, upon reconstitution in a pharmaceutically acceptable diluent, when provided in a vial, the daptomycin formulations include daptomycin at a concentration of about 50 mg / mL. In another embodiment, upon reconstitution in a pharmaceutically acceptable diluent, when provided in a vial, the daptomycin formulations include daptomycin at a concentration of about 62.5 mg / mL.

[0034] The reconstituted daptomycin formulation can be further diluted in a pharmaceutically acceptable diluent for administration to a subject. Pharmaceutically acceptable diluents include, but are not limited to, sterile water for injection, bacteriostatic water for injection, 0.45% sodium chloride solution for injection, 0.9% sodium chloride solution for injection, Ringer's solution and lactated Ringer's solution. In one embodiment, when the reconstituted daptomycin formulation is further diluted for administration to a subject, the final daptomycin concentration is from about 2.5 to about 20 mg / mL.

[0035] The additive is citric acid. The concentration of citric acid in the reconstituted formulation is from 25 mM to 75 mM.

[0036] In certain embodiments, upon reconstitution in a pharmaceutically acceptable diluent, the pH of the presently disclosed daptomycin formulations is in the range of from about 4.0 to about 7.0. In one embodiment, the pH is in the range of from about 4.0 to about 5.0.

[0037] The purity of the daptomycin in the lyophilized daptomycin formulations of the presently disclosed subject matter can be measured by any means known to one of ordinary skill in the art, including nuclear magnetic resonance (NMR), or high performance liquid chromoatography coupled with UV (HPLC / UV) or mass spectrometry (HPLC / MS). In one embodiment, the purity of the lyophilized daptomycin formulations is measured by reconstitution in a pharmaceutically acceptable diluent followed by analysis employing HPLC / UV. The HPLC / UV process utilised for measuring the purity of the lyophilized daptomycin formulations can be any method known to one of ordinary skill in the art, e.g., using appropriate HPLC / UV machines typically encountered in the industry, such as the HPLC / UV process described in US Patent 2007 / 191280 A1 . In one non-limiting example, the purity of daptomycin in a reconstituted solution of a lyophilized daptomycin formulation of the presently disclosed subject matter can be determined by HPLC / UV followed by analysis of the peak area (the area-under-the curve-(AUC)) at a wavelength of 223 nm for individual peaks of the chromatogram. The amount of daptomycin can be measured with respect to the total amount of impurities present. Further, the relative amount of daptomycin with respect to three of the known daptomycin degradants, specifically the anhydro-daptomycin, the β-isomer of daptomycin and the lactone hydrolysis product of daptomycin can be determined.

[0038] In one embodiment, the lyophilized daptomycin formulations of the presently disclosed subject matter include daptomycin in a purity that is higher than that of CUBICIN ®< product as determined by HPLC / UV analysis of the reconstituted solution at a wavelength of 223 nm. In another embodiment, the lyophilized daptomycin formulations of the presently disclosed subject matter include total impurities in an amount of less than that of the CUBICIN ®< product as determined by HPLC / UV analysis of the reconstituted solution at a wavelength of 223 nm.Methods of Using Lyophilized Daptomycin Formulations

[0039] The presently disclosed subject matter further provides a lyophilized daptomycin formulation for use in a method of treating a bacterial infection in a subject. The method includes administering to a subject in need thereof, an effective amount of a lyophilized daptomycin formulation as described above.Methods of Preparing Lyophilized Daptomycin Formulations

[0040] Furthermore, the presently disclosed subject matter provides a method for preparing the presently disclosed lyophilized daptomycin formulation. The lyophilized daptomycin formulation can be lyophilized from any solvent known to be suitable in the art. Acceptable solvents include, but are not limited to, water, aqueous butanol and aqueous ethanol. The lyophilisation process utilised to prepare the presently disclosed lyophilized daptomycin formulations can be any method known to one of ordinary skill in the art using appropriate freeze drying machines typically encountered in the industry. Exemplary lyophilisation processes include those described in "Lyophilization: Introduction and Basic Principles" by

[0041] Thomas A Jennings, InterPharm Press, 1999. In some embodiments, the method includes: (a) forming an aqueous solution of the daptomycin and citric acid, (b) adjusting the pH to about 4.0 to about 5.0; and (c) lyophilising the solution to obtain a lyophilisate. In one embodiment, the method includes: (a) forming an aqueous solution of the daptomycin at a pH of about 4.0 to about 5.0; (b) dissolving citric acid in the aqueous solution of the daptomycin; (c) adjusting the pH to about 4.0 to about 5.0; and (d) lyophilising the solution to obtain a powder. In another embodiment, the method includes: (a) forming an aqueous tertiary-butanol solution of the daptomycin at a pH of 4.0 to 5.0; (b) dissolving citric acid in the aqueous / butanol solution of the daptomycin; (c) adjusting the pH to about 4.0 to about 5.0; and (d) lyophilising the solution to obtain a powder.EXAMPLES

[0042] The following examples are merely illustrative of the presently disclosed subject matter and they should not be considered as limiting the scope of the invention in any way.Example 1 1. Lyophilized daptomycin formulations

[0043] Table 1 provides examples of daptomycin formulation solutions that were subsequently lyophilized to produce lyophilized formulations. Formulations B, C, D and E are for reference only. Table 1Formulation Formulation Components A Daptomycin (350 mg / vial),Citric acid (56 mg / vial)NaOH (2M, 0.14 mL / vial)WaterAdditional NaOH to adjust pHB Daptomycin (350 mg / vial)Tartaric acid (84 mg / vial),NaOH (2M, 0.14 mL / vial)WaterAdditional NaOH to adjust pHC Daptomycin (350 mg / vial),Succinic acid (67.2 mg / vial ),NaOH (2M, 0.14 mL / vial)WaterAdditional NaOH to adjust pHD Daptomycin (350 mg / vial),Edetic acid (140 mg / vial),NaOH (2M, 0.14 mL / vial)WaterAdditional NaOH to adjust pHE Daptomycin (350 mg / vial), NaOH (2M, 0.14 mL / vial) t< Butanol (1.12 mL / vial) Water Additional NaOH to adjust pHF Daptomycin (350 mg / vial), Citric acid (56 mg / vial), Water II. Analysis of Daptomycin Formulations

[0044] Reconstitution time was determined by injecting 7 mL of 0.9% sterile sodium chloride for injection to a vial including 350 mg of the lyophilized daptomycin formulation. The resultant mixture was swirled for about 1 minute and allowed to stand. The reconstitution time is the time required from addition of the diluent to total dissolution of the daptomycin formulation.

[0045] Table 2 provides reconstitution times of the lyophilized daptomycin formulations including an additive in 0.9% sterile sodium chloride for injection. Initial reconstitution times, and reconstitution after 1, 3 or 6 months of storage at 5°C, 25°C and 40°C for the compositions are provided. The pH of the reconstituted lyophilized daptomycin formulations is 4.7. The reconstitution times of the CUBICIN ®< product are included for comparison. Table 2Formulation at 5 °C Initial 3 months 6 months A 2 min 40 sec1 min 35 secNot testedB 1 min 10 sec2 min 0 secNot testedC 3 min 20 sec5 min 50 secNot testedD 2 min 30 sec2 min 10 secNot testedE Not testedNot testedNot testedCUBICIN ®< 18 min 00 sec21 min 30 sec13 min 00 secFormulation at 25 °C Initial 3 months 6 months A 2 min 40 sec2 min 35 sec2 min 45 secB 1 min 10 sec1 min 0 secNot testedC 3 min 20 sec4 min 40 secNot testedD 2 min 30 sec1 min 0 secNot testedE 10 min 30 secNot testedNot testedCUBICIN ®< 18 min 00 sec14 min 55 sec14 min 42 secFormulation at 40 °C Initial 3 months 6 months A 2 min 40 sec1 min 50 secNot testedB Not testedNot tested0 min 55 secC 1 min 10 sec1 min 0 secNot testedD 3 min 20 sec11 min 30 secNot testedE 2 min 30 sec1 min 0 secNot testedF Not testedNot testedNot testedCUBICIN ®< 18 min 00 secNot testedNot tested

[0046] The effect of pH on the reconstitution time of the daptomycin lyophilized powder including citric acid was assessed. Table 3 provides the reconstitution times in 0.9% sterile sodium chloride for injection of lyophilized daptomycin formulations including 350 mg daptomycin, 56 mg citric acid and sodium hydroxide sufficient to adjust the pH of the lyophilisation solution upon reconstitution of the lyophilized formulation. Initial reconstitution times and reconstitution times after 3 months of storage at 40°C for the compositions is provided. Table 3Formulation pH Initial 3 months 2.5 3 min 0 sec2 min 30 sec3.0 3 min 0 sec2 min 30 sec3.3 > 5 min 0 sec3 min 15 sec3.5 > 5 min 0 sec4 min 30 sec3.8 > 5 min 0 sec4 min 54 sec4.0 1 min 50 sec5 min 00 sec4.3 1 min 30 sec2 min 20 sec4.5 1 min 20 sec3 min 28 sec4.8 2 min 20 sec1 min 21 sec5.0 2 min 0 sec3 min 00 sec5.3 1 min 0 sec2 min 20 sec5.5 1 min 0 sec1 min 20 sec5.8 1 min 10 sec1 min 30 sec6.0 1 min 10 sec1 min 40 sec6.3 1 min 0 sec1 min 46 sec6.5 0 min 50 sec1 min 30 sec6.8 0 min 50 sec1 min 10 sec7.0 0 min 20 sec0 min 58 sec

[0047] The lyophilized daptomycin formulations of the presently disclosed subject matter were tested for daptomycin stability as a relative measure of daptomycin degradant impurity levels. The lyophilized daptomycin formulations were reconstituted in 0.9% sterile sodium chloride for injection the resultant solutions analysed by HPLC / UV. The amount of daptomycin and impurities in the solution were determined by % peak area at a wavelength of 223 nm. The total amount of impurities was calculated from the % peak area at a wavelength of 223 nm for all peaks other than that of daptomycin. The data are presented in the following Tables 4-9.

[0048] Table 4 displays the amount of total impurities, represented as % peak area, for each composition at 1, 2, 3 and 6 months after storage at 5, 25 and 40°C. The difference from the initial value is shown in parentheses. Table 4Formulation at 5 °C Total Impurities Initial Total Impurities 1 month Total Impurities 2 months Total Impurities 3 months Total Impurities 6 months A 4.62Not tested4.82 (0.2)4.42 (-0.20)Not testedB 4.64Not testedNot tested4.88 (0.24)Not testedC 4.97Not testedNot tested4.60 (-0.37)Not testedD 4.68Not testedNot tested4.52 (-0.16)Not testedCUBICIN ®< 6.38Not testedNot tested6.57 (0.19)6.89 (0.51)Formulation at 25 °C Total Impurities Initial Total Impurities 1 month Total Impurities 2 months Total Impurities 3 months Total Impurities 6 months A 4.624.98 (0.36)5.13 (0.51)4.42 (-0.2)5.28 (0.66)B 4.644.62 (-0.02)4.73 (0.09)5.13 (0.49)Not testedC 4.974.59 (-0.38)4.75 (-0.22)5.13 (0.16)Not testedD 4.684.45 (-0.23)4.60 (-0.08)4.91 (0.23)Not testedCUBICIN ®< 6.386.98 (0.60)6.71 (0.33)7.18 (0.80)7.87 (1.49)Formulation at 40 °C Total Impurities Initial Total Impurities 1 month Total Impurities 2 months Total Impurities 3 months Total Impurities 6 months A 4.624.68 (0.06)Not tested5.83 (1.21)Not testedB 4.645.29 (0.65)5.36 (0.72)5.77 (1.13)Not testedC 4.975.98 (1.01)6.91 (1.94)7.79 (2.82)Not testedD 4.684.97 (0.29)5.38 (0.70)5.89 (1.21)Not testedCUBICIN ®< 6.38Not testedNot testedNot testedNot tested

[0049] Table 5 displays the amount of the anhdyro daptomycin impurities, represented as % peak area, for each composition at 1, 2, 3 and 6 months after storage at 5, 25 and 40°C. The difference from the initial value is shown in parentheses. Table 5Formulation at 5 °C Anhydro Impurity Initial Anhydro Impurity 1 month Anhydro Impurity 2 months Anhydro Impurity 3 months Anhydro Impurity 6 months A 1.18Not tested1.1 (-0.08)1.06 (-0.12)Not testedB 0.97Not testedNot tested1.00 (0.03)Not testedC 1.08Not testedNot tested1.04 (-0.04)Not testedD 1.11Not testedNot tested1.09 (-0.02)Not testedCUBICIN ®< 1.71Not testedNot tested1.69 (-0.02)2.06 (0.35)Formulation Anhydro Anhydro Anhydro Anhydro Anhydro at 25 °C Impurity Initial Impurity 1 month Impurity 2 months Impurity 3 months Impurity 6 months A 1.181.19 (0.01)1.29 (0.11)1.22 (0.04)1.45 (0.27)B 0.971.04 (0.07)1.11 (0.14)1.18 (0.21)Not testedC 1.081.16 (0.08)1.27 (0.19)1.39 (0.31)Not testedD 1.111.15 (0.04)1.16 (0.05)1.32 (0.21)Not testedCUBICIN ®< 1.711.92 (0.21)2.23 (0.52)2.06 (0.35)2.56 (0.85)Formulation at 40 °C Anhydro Impurity Initial Anhydro Impurity 1 month Anhydro Impurity 2 months Anhydro Impurity 3 months Anhydro Impurity 6 months A 1.181.48 (0.30)Not tested1.72 (0.54)Not testedB 0.971.33 (0.36)1.49 (0.52)1.63 (0.66)Not testedC 1.081.71 (0.63)2.05 (0.97)2.49 (2.41))Not testedD 1.111.50 (0.39)1.71 (0.60)1.87 (0.76)Not testedCUBICIN ®< 1.71Not testedNot testedNot testedNot tested

[0050] Table 6 displays the amount of the hydrolysis daptomycin impurities, represented as % peak area, for each composition at 1, 2, 3 and 6 months after storage at 5, 25 and 40°C. The difference from the initial value is shown in parentheses. Table 6Formulation at 5 °C Hydrolysis Impurity Initial Hydrolysis Impurity 1 month Hydrolysis Impurity 2 months Hydrolysis Impurity 3 months Hydrolysis Impurity 6 months A 0.52Not tested0.57 (0.05)0.53 (0.01)Not testedB 0.73Not testedNot tested0.68 (-0.05)Not testedC 0.62Not testedNot tested0.53 (-0.09)Not testedD 0.51Not testedNot tested0.43 (-0.08)Not testedCUBICIN ®< 0.40Not testedNot tested0.44 (0.04)0.45 (0.05)Formulation at 25 °C Hydrolysis Impurity Initial Hydrolysis Impurity 1 month Hydrolysis Impurity 2 month Hydrolysis Impurity 3 months Hydrolysis Impurity 6 months A 0.520.61 (0.09)0.64 (0.12)0.61 (0.09)0.62 (0.10)B 0.730.75 (0.02)0.79 (0.06)0.76 (0.03)Not testedC 0.620.66 (0.04)0.71 (0.09)0.77 (0.15)Not testedD 0.510.52 (0.01)0.55 (0.04)0.53 (0.02)Not testedCUBICIN ®< 0.400.49 (0.09)0.51 (0.11)0.56 (0.16)0.65 (0.25)Formulation at 40 °C Hydrolysis Impurity Initial Hydrolysis Impurity 1 month Hydrolysis Impurity 2 month Hydrolysis Impurity 3 months Hydrolysis Impurity 6 months A 0.520.66 (0.14)Not tested0.86 (0.34)Not testedB 0.730.89 (0.16)0.96 (0.23)1.02 (0.29)Not testedC 0.620.98 (0.36)1.18 (0.56)1.39 (0.77)Not testedD 0.510.64 (0.13)0.73 (0.22)0.80 (0.29)Not testedCUBICIN ®< 0.40Not testedNot testedNot testedNot tested

[0051] Table 7 displays the amount of the β-isomer daptomycin impurities, represented as % peak area, for each composition at 1, 2, 3 and 6 months after storage at 5, 25 and 40°C. The difference from the initial value is shown in parentheses. Table 7Formulation at 5 °C β-Isomer Impurity Initial β-Isomer Impurity 1 month β-Isomer Impurity 2 months β-Isomer Impurity 3 months β-Isomer Impurity 6 months A 0.56Not tested0.6 (0.04)0.62 (0.06)Not testedB 0.64Not testedNot tested0.70 (0.06)Not testedC 0.62Not testedNot tested0.63 (0.01)Not testedD 0.57Not testedNot tested0.60 (0.03)Not testedCUBICIN ®< 1.15Not testedNot tested1.17 (0.02)1.17 (0.02)Formulation at 25 °C β-Isomer Impurity Initial β-Isomer Impurity 1 month β-Isomer Impurity 2 months β-Isomer Impurity 3 months β-Isomer Impurity 6 months A 0.560.6 (0.04)0.6 (0.04)0.61 (0.05)0.64 (0.08)B 0.640.67 (0.03)0.67 (0.03)0.69 (0.05)Not testedC 0.620.62 (0)0.62 (0.00)0.63 (0.01)Not testedD 0.570.59 (0.02)0.59 (0.02)0.60 (0.03)Not testedCUBICIN ®< 1.151.16 (0.01)1.20 (0.05)1.17 (0.02)1.19 (0.04)Formulation at 40 °C β-Isomer Impurity Initial β-Isomer Impurity 1 month β-Isomer Impurity 2 months β-Isomer Impurity 3 months β-Isomer Impurity 6 months A 0.560.54 (-0.02)Not tested0.63 (0.07)Not testedB 0.53Not testedNot testedNot tested0.59 (0.06)C 0.640.69 (0.05)0.68 (0.04)0.69 (0.05)Not testedD 0.620.64 (0.02)0.64 (0.02)0.65 (0.03)Not testedE 0.570.60 (0.03)0.61 (0.04)0.62 (0.05)Not testedCUBICIN ®< 1.15Not testedNot testedNot testedNot tested

[0052] The effect of pH on the stability of the lyophilized daptomycin formulations including citric acid were tested as a relative measure of daptomycin degradant impurity levels. The lyophilized daptomycin formulations, including 350 mg daptomycin, 56 mg citric acid, and sodium hydroxide sufficient to adjust the pH of the lyophilisation solution, were reconstituted in 0.9% sterile sodium chloride for injection and the resultant solutions analysed by HPLC / UV. Table 8 displays the amount of daptomycin impurities, represented as % peak area, for each composition upon initial preparation and after storage at 25°C for 3 months. The difference from the initial value is shown in parentheses. Table 8pH Anhydro Impurities Initial Anhydro Impurities 3 months Hydrolysis Impurities Initial Hydrolysis Impurities 3 months β-Isomer Impurities Initial β-Isomer Impurities 3 months 2.5 0.831.10 (0.27)0.400.37 (-0.03)0.570.51 (-0.06)3.0 0.881.17 (0.29)0.450.42 (-0.03)0.580.52 (-0.06)3.3 0.881.19 (0.31)0.460.43 (-0.03)0.580.53 (-0.05)3.5 0.901.27 (0.37)0.470.46 (-0.01)0.580.54 (-0.04)3.8 0.931.32 (0.39)0.490.49 (0.00)0.590.54 (-0.05)4.0 0.931.25 (0.32)0.530.53 (0.00)0.600.56 (-0.04)4.3 0.941.26 (0.32)0.550.58 (0.03)0.610.58 (-0.03)4.5 0.961.27 (0.31)0.580.62 (0.04)0.620.58 (-0.04)4.8 0.951.26 (0.31)0.640.72 (0.08)0.650.61 (-0.04)5.0 0.951.23 (0.28)0.640.76 (0.12)0.650.62 (-0.03)5.3 0.901.15 (0.25)0.690.85 (0.16)0.660.63 (-0.03)5.5 0.871.10 (0.23)0.740.95 (0.21)0.680.65 (-0.03)5.8 0.831.01 (0.18)0.841.18 (0.34)0.720.67 (-0.05)6.0 0.800.94 (0.14)1.011.42 (0.41)0.740.69 (-0.05)6.3 0.740.89 (0.15)1.091.59 (0.50)0.760.72 (-0.04)6.5 0.690.86 (0.17)1.161.80 (0.64)0.770.76 (-0.01)6.8 0.650.80 (0.15)1.201.90 (0.70)0.770.74 (-0.03)7.0 0.640.78 (0.14)1.242.00 (0.76)0.790.83 (0.04)

[0053] Table 9 displays the total amount of all daptomycin impurities, represented as % peak area, for each composition upon initial preparation and after storage at 25°C for 3 months. The difference from the initial value is shown in parentheses. Table 9pH Total Impurities Initial Total Impurities 3 months 2.5 4.026.12 (2.10)3.0 4.185.68 (1.50)3.3 4.155.32 (1.17)3.5 4.215.37 (1.16)3.8 4.135.24 (1.11)4.0 4.325.16 (0.84)4.3 4.205.19 (0.99)4.5 4.315.21 (0.90)4.8 4.545.29 (0.75)5.0 4.365.34 (0.98)5.3 4.395.34 (0.95)5.5 4.575.45 (0.88)5.8 4.785.40 (0.62)6.0 4.745.57 (0.83)6.3 4.795.80 (1.01)6.5 4.976.60 (1.63)6.8 4.775.90 (1.13)7.0 4.846.19 (1.35) Example 2

[0054] The osmolalites of the presently disclosed lyophilized daptomycin formulations including citric acid (175 mM, 237.5 mM, 300 mM or 500 mM), ascorbic acid (237.5 mM or 300 mM) and 62.5 mg / mL daptomycin were assessed.

[0055] Table 10 provides the osmolalities of the lyophilized daptomycin formulations including ascorbic acid, citric acid in either sterile water for injection ("WFI") or a 0.9% sodium chloride solution for injection. The pH of the reconstituted lyophilized daptomycin formulations was in the range of 4.45 to 4.74. The osmolalities of the CUBICIN ®< product and of a benchmark sucrose daptomycin formulation were included for comparison. Table 10Infusion solution concentrationOsmolality (mOsmol / kq)CUBICIN ®< Sucros eCitric acidAscorbic acidCDF049M438 mM175 mM237. 5 mM300 mM500 mM237.5 mM300 mMNaCl reconstitutio nIV Bolus (50 mg / mL)3387126427408281156636705IV Infusion (20 mg / mL)310444435473510628425453IV Infusion (10 mg / mL)30236364383400464357367WFI reconstitutio nIV Bolus (50 mg / mL)49427Not tested458572940343421IV Infusion (20 mg / mL)198Not testedNot testedNot teste d398562315344IV Infusion (10 mg / mL)249313Not tested327344422306321

[0056] The osmolalites of the ascorbic acid daptomycin formulations were lower than those of the citric acid daptomycin formulations.Example 3

[0057] The reconstitution times, osmolalities, color appearances and stabilities of the presently disclosed lyophilized daptomycin formulations, e.g., including ascorbic acid, citric acid, and acetyl glucosamine as an additive and 62.5 mg / mL daptomycin, were assessed.

[0058] Reconstitution time was determined by injecting 7 mL of a 0.9% sodium chloride solution to a vial containing 350 mg / vial of lyophilized daptomycin. The resultant mixture was swirled for one minute and allowed to stand. The reconstitution time is the time required for addition of the diluent to total dissolution of the lyophilized daptomycin formulation. Table 11Concentration of the additive Average reconstitution time for a lyophilized daptomycin formulation including citric acid Average reconstitution time for a lyophilized daptomycin formulation including ascorbic acid Average reconstitution time for a lyophilized daptomycin formulation including acetyl glucosamine Sucro se CUBICI N ®< 237.5 mM 1m 55s (all samples, n=15) 1< 1m 45s (all samples)3m 39s (all samples, n=15) 2< 1m 01s (all sample s)23m 44s (all samples )(n=15)300 mM 2m 14s (all samples, n=30) 1< 1m 57s (all samples, n=30) 3< 3m 8s (all samples, n=30) 4< (n=8)(n=10)

[0059] Table 11 provides the average reconstitution times of the lyophilized daptomycin formulations including ascorbic acid, citric acid, and acetyl glucosamine in a 0.9% sodium chloride solution for injection. The pH of the reconstituted lyophilized daptomycin formulations was in the range of 4.45 to 4.74. The reconstitution times of the CUBICIN ®< product and of a benchmark sucrose daptomycin formulation were included for comparison. 1< 2 samples had a reconstitution time of > 5 min 2< 3 samples had a reconstitution time of > 5 min 3< 1 sample had a reconstitution time of > 5 min 4< 6 samples had a reconstitution time of > 5 min

[0060] Table 12 provides the osmolalities of the lyophilized daptomycin formulations including ascorbic acid, citric acid and acetyl glucosamine. These formulations were reconstituted with a 0.9% sterile sodium chloride solution for injection and WFI. The osmolalities of the CUBICIN ®< product and of a benchmark sucrose daptomycin formulation were included for comparison, as shown in Table 13. Table 12Concentration of the additive Administration Osmolality of a lyophilized daptomycin formulation including citric acid Osmolality of a lyophilized daptomycin formulation including ascorbic acid Osmolality of a lyophilized daptomycin formulation including acetyl glucosamine 237.5 mM 0.9% Sodium Chloride reconstitution (mOsmol / Kg)Bolus (50 mg / mL)740636548Infusion (10mg / mL)383357339WFI reconstitution (mOsmol / Kg)Bolus (50 mg / mL)458343249Infusion (10mg / mL)327306289300 mM 0.9% Sodium Chloride reconstitution (mOsmol / Kg)Bolus (50 mg / mL)828705602Infusion (10mg / mL)400367346WFI reconstitution (mOsmol / Kg)Bolus (50 mg / mL)572421305Infusion (10mg / mL)344321297 Table 13 Administration Osmolality of sucrose Osmolality of CUBACIN ®< 0.9% Sodium Chloride reconstitution (mOsmol / Kg)Bolus (50 mg / mL)712338Infusion (10 mg / mL)366302 WFI reconstitution (mOsmol / Kg)Bolus (50 mg / mL)42749Infusion (10 mg / mL)313249 Table 14 provides the initial color appearances of the lyophilized daptomycin formulations including ascorbic acid, citric acid and acetyl glucosamine at a 50 mg / mL bolus or 10 mg / mL infusion solution exposed to a temperature of ambient laboratory temperature (about 20°C) and a lighting condition of ambient laboratory lighting (about 400 lux). The color appearances of the CUBICIN® product and a benchmark sucrose daptomycin formulation were included for comparison. Table 14 Formulation concentration Citric acid Ascorbic acid Acetyl Glucosami ne Sucrose CUBICIN ®< 237.5 mMLight yellowLight yellow to light brownLight yellowLight yellowLight yellow300 mM

[0061] The lyophilized daptomycin formulations including ascorbic acid (237.5 mM and 300 mM), citric acid (237.5 mM and 300 mM), or acetyl glucosamine (237.5 mM and 300 mM), and 62.5 mg / mL daptomycin were tested for daptomycin stability as a relative measure of daptomycin degradant impurity level. The amount of daptomycin and impurities in the solution were determined by the % peak area at a wavelength of 223 nm. Table 15 displays the amount of daptomycin impurities, represented as % peak area, for each composition upon initial preparation and after storage at 25°C and 40°C for 2, 3 and 6 months. The difference from the initial value was shown in parentheses. The impurities of the CUBICIN ®< product and a benchmark sucrose daptomycin formulation were included for comparison. Table 15Temp eratur e (°C) Additiv e Concen -tration Additive Time point (month) Impurity % Hydrolysis Anhydro-Daptomyci n Impurity 1 B isomer 25°C237.5 mMCitric AcidT=00.431.050.120.57T=20.48 (0.06)1.02 (-0.03)0.07 (-0.05)0.57 (0.0)T=30.46 (0.03)1.10 (0.05)0.07 (-0.05)0.52 (-0.05)T=60.43 (0.00)1.11 (0.06)0.07 (-0.06)0.53 (-0.04)Ascorbic AcidT=00.431.110.120.60T=20.52 (0.10)1.14 (0.03)0.14 (0.02)0.53 (-0.07)T=30.52 (0.09)1.12 (0.01)0.12 (0.00)0.53 (-0.07)T=60.46 (0.04)1.14 (0.03)0.29 (0.17)0.55 (-0.05)Acetyl GlucosamineT=00.410.970.100.56T=20.45 (0.04)1.04 (0.07)0.07 (-0.03)0.52 (-0.04)T=30.46 (0.05)1.10 (0.13)0.07 (-0.03)0.52 (-0.04)T=60.43 (0.03)1.07 (0.10)0.12 (0.02)0.60 (0.04)300 mMCitric AcidT=00.401.050.120.56T=20.46 (0.06)1.03 (0.02)0.08 (-0.04)0.56 (0.00)T=30.44 (0.04)1.13 (0.08)0.07 (-0.04)0.51 (-0.05)T=60.40 (0.0)1.06 (0.01)0.06 (-0.05)0.51 (-0.05)Ascorbic AcidT=00.421.130.110.59T=20.50 (0.08)1.16 (0.03)0.12 (0.02)0.53 (-0.06)T=30.49 (0.07)1.12 (-0.01)0.11 (0.0)0.53 (-0.06)T=60.45 (0.03)1.12 (-0.01)0.22 (0.12)0.54 (-0.05)Acetyl GlucosamineT=00.400.970.100.59T=20.44 (0.04)1.03 (0.05)0.07 (-0.03)0.52 (-0.07)T=30.44 (0.04)1.13 (0.16)0.07 (-0.03)0.51 (-0.07)T=60.42 (0.02)1.05 (0.08)0.12 (0.02)0.59 (0.0)438 mMSucrose (Benchma rk formulatio n)T=00.530.910.080.53T=20.67 (0.14)0.99 (0.08)0.08 (0.0)0.59 (0.06)T=30.58 (0.05)0.95 (0.04)0.06 (-0.02)0.52 (-0.01)T=60.55 (0.02)0.98 (0.07)0.12 (0.04)0.48 (-0.05)Cubicin ®< T=00.792.380.281.13T=20.58 (-0.21)1.87 (-0.51)0.40 (0.12)1.15 (0.02)T=30.60 (-0.19)1.94 (-0.44)0.19 (-0.09)1.08 (-0.05)T=60.67 (-0.12)2.17 (-0.21)0.26 (-0.02)1.16 (0.03)40 °C 237.5 mMCitric AcidT=00.431.050.120.57T=10.48 (0.05)1.17 (0.12)0.08 (-0.05)0.55 (-0.03)T=20.51 (0.09)1.26 (0.21)0.06 (-0.06)0.59 (0.01)T=30.52 (0.09)1.27 (0.22)0.04 (-0.08)0.51 (-0.06)T=60.57 (0.14)1.44 (0.39)0.12 (0.0)0.54 (-0.03)Ascorbic AcidT=00.431.110.120.60T=10.59 (0.16)1.25 (0.14)0.19 (0.07)0.61 (0.01)T=20.63 (0.21)1.30 (0.20)0.31 (0.19)0.63 (-0.03)T=30.66 (0.23)1.32 (0.22)0.22 (0.10)0.57 (-0.03)T=60.66 (0.23)1.40 (0.29)0.27 (0.15)0.71 (0.11)Acetyl GlucosamineT=00.410.970.100.56T=10.47 (0.06)1.13 (0.16)0.08 (-0.02)0.54 (-0.02)T=20.49 (0.09)1.20 (0.23)0.09 (-0.01)0.64 (0.08)T=30.50 (0.09)1.26 (0.29)0.04 (-0.06)0.56 (0.0)T=60.54 (0.13)1.52 (0.55)0.26 (0.16)0.71 (0.15)300 mMCitric AcidT=00.401.050.120.56T=10.44 (0.04)1.19 (0.13)0.08 (-0.05)0.54 (-0.02)T=20.47 (0.07)1.28 (0.23)0.06 (-0.06)0.55 (-0.02)T=30.48 (0.08)1.25 (0.20)0.05 (-0.07)0.50 (-0.06)T=60.50 (0.10)1.40 (0.35)0.14 (0.02)0.55 (-0.01)Ascorbic AcidT=00.421.130.110.59T=10.55 (0.13)1.24 (0.11)0.16 (0.06)0.60 (0.01)T=20.60 (0.18)1.28 (0.15)0.25 (0.14)0.62 (0.03)T=30.59 (0.17)1.29 (0.16)0.18 (0.07)0.56 (-0.03)T=60.60 (0.18)1.32 (0.19)0.26 (0.15)0.69 (0.10)AcetylT=00.400.970.100.59GlucosamineT=10.46 (0.06)1.11 (0.14)0.08 (-0.02)0.54 (-0.05)T=20.48 (0.08)1.16 (0.19)0.09 (-0.01)0.60 (0.01)T=30.47 (0.07)1.19 (0.22)0.09 (-0.01)0.55 (-0.04)T=60.57 (0.17)1.40 (0.43)0.11 (0.01)0.65 (0.06)438 mMSucrose (Benchma rk formulatio n)T=00.530.910.080.53T=10.59 (0.06)1.05 (0.14)0.06 (-0.02)0.64 (0.11)T=20.67 (0.14)1.13 (0.22)0.06 (-0.02)0.58 (0.05)T=30.59 (0.06)1.11 (0.20)0.15 (0.07)0.53 (0.0)T=60.55 (0.02)1.24 (0.33)0.14 (0.06)0.48 (-0.05)Cubicin ®< T=00.511.550.301.14T=10.79 (0.28)2.38 (0.83)0.28 (-0.02)1.13 (-0.01)T=20.94 (0.43)2.80 (1.25)0.29 (-0.02)1.16 (0.02)T=31.04 (0.53)3.20 (1.65)0.22 (0.07)1.10 (-0.04)T=61.24 (0.73)3.70 (2.15)N / A1.20 (0.06)

[0062] As shown in Table 15, when stored at 25°C for 6 months, the anhydro daptomycin impurities increased up to about 0.1% for all formulations compared to the initial value, which was comparable to the benchmark Sucrose daptomycin formulation. Impurity 1 increased by about 0.2% for both 237.5 mM and 300 mM lyophilised ascorbic acid daptomycin formulations, by about 0.02% for both 237.5 mM and 300 mM lyophilised acetyl glucosamine daptomycin formulations, while remained stable for both 237.5 mM and 300 mM lyophilised citric acid daptomycin formulations, which was comparable to benchmark Sucrose daptomycin formulation and the CUBICIN ®< product. All other major impurities remained stable without significant increases. The β-isomer daptomycin impurity remained stable for almost all formulations.

[0063] When stored at 40°C for 6 months, differences in the increases of anhydro daptomycin impurities were observed between citric acid formulations and ascorbic acid formulations. Impurity 1 & β-isomer daptomycin impurities remained stable for the citric acid formulations, however increased up to 0.2% & 0.1%, respectively, for the ascorbic acid formulations, compared to the initial value. Hydrolysis impurity increased up to 0.14% for the citric acid formulations (0.14% for the 237.5 mM formulation, and 0.1% for the 300 mM formulation).

[0064] Hydrolysis impurity increased up to 0.23% for the ascorbic acid formulations (0.23% for the 237.5 mM formulation, and 0.18% for the 300 mM formulation). Hydrolysis impurity increased up to 0.17% for the acetyl glucosamine formulations (0.14% for the 237.5 mM formulation, and 0.17% for the 300 mM formulation). Anhydro daptomycin impurities increased up to 0.39% for the citric acid formulations and up to 0.29% for the ascorbic acid formulations, which was comparable to the Sucrose formulation. The rate of increase for anhydro daptomycin impurities was the lowest for the 300 mM ascorbic acid formulation. The rates of increase for all other major impurities were approximately double for ascorbic acid formulations compared to citric acid formulations.

[0065] The above-presented stability data showed that citric acid lyophilized daptomycin formulations have a slight advantage over ascorbic acid lyophilized daptomycin formulations and acetyl glucosamine lyophilized daptomycin formulations as citric acid lyophilized daptomycin formulations would tolerate heat excursions better than ascorbic acid lyophilized daptomycin formulations and acetyl glucosamine lyophilized daptomycin formulations.

[0066] The impurity amounts or stability for the 237.5 mM formulations were comparable to the 300 mM formulations, e.g., the 237.5 mM formulation was not significantly different from the 300 mM formulation for citric acid. In some examples, a 237.5 mM formulation concentration is preferred at least because it has lower osmolality, and it is possibly easy to register lower the amounts of the additives.Example 4

[0067] The color appearances of the presently disclosed lyophilized daptomycin formulations, e.g., including ascorbic acid (237.5 mM and 300 mM) or citric acid (237.5 mM and 300 mM) and 62.5 mg / mL daptomycin at 50 mg / mL IV bolus or 10 mg / mL IV infusion at initial, 4, 24, and 48 hours exposed to room temperature and lighting conditions of about 400 lux, were assessed. The color appearances for the CUBICIN ®< product and for a benchmark sucrose daptomycin formulation were included for comparison. The lyophilized daptomycin formulations and the benchmark sucrose daptomycin formulation were reconstituted in both 0.9% NaCl and WFI.

[0068] In a 50 mg / mL IV bolus solution, the general color trend of all daptomycin formulations was a light yellow at initial and four hours followed by an increase in color intensity to yellow at 24 to 48 hours. The benchmark sucrose daptomycin formulation was a slightly dull / less intense yellow. Both 237.5 mM and 300 mM citric acid daptomycin formulations were equivalent to the CUBICIN ®< product in color. Both 237.5 mM and 300 mM ascorbic acid daptomycin formulations were slightly more intense yellow in color than the CUBICIN ®< product at 24 to 48 hours.

[0069] 10 mg / mL IV infusion solution, the general color trend of all solutions was light yellow, which remained light yellow over time to 48 hours. The benchmark sucrose daptomycin formulation was slightly less intense yellow. Both 237.5 mM and 300 mM citric acid daptomycin formulations were equivalent to the CUBICIN ®< product in color. Both 237.5 mM and 300 mM ascorbic acid daptomycin formulations were slightly lighter then the CUBICIN ®< product at 24 to 48 hours.

[0070] Therefore, all reconstituted solutions were essentially yellow with any variation considered different shades of yellow compared to the yellow of the CUBICIN ®< product. The color differences between the ascorbic acid daptomycin formulations and the CUBICIN ®< product were subtle. Therefore, the reconstituted solution color of both citric acid and ascorbic acid daptomycin formulations are acceptable.

[0071] Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is solely for the purpose of providing a context for the present invention. It is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed before the priority date of each claim of the application.

Claims

1. A lyophilized daptomycin formulation comprising from 200mg to 600mg of daptomycin and the additive citric acid which, upon reconstitution in a pharmaceutically acceptable diluent, leads to a daptomycin concentration of from 20mg / mL to 100mg / mL and a citric acid concentration of from 25mM to 75mM.

2. The lyophilized daptomycin formulation of claim 1, which, upon reconstitution in a pharmaceutically acceptable diluent, leads to a daptomycin concentration of 50mg / mL to 60mg / mL.

3. The lyophilized daptomycin formulation of claim 1 or claim 2 for use in a method of treating a bacterial infection in a subject, said method comprising reconstituting the lyophilised daptomycin formulation in a pharmaceutically acceptable diluent and administering to a subject in need thereof an effective amount of the reconstituted lyophilised daptomycin formulation.