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US20130274472A1 - Sodium salt of 6-fluoro-3-hydroxy-2-pyrazine carboxamide - Google Patents

Sodium salt of 6-fluoro-3-hydroxy-2-pyrazine carboxamide Download PDF

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Publication number
US20130274472A1
US20130274472A1 US13/876,998 US201113876998A US2013274472A1 US 20130274472 A1 US20130274472 A1 US 20130274472A1 US 201113876998 A US201113876998 A US 201113876998A US 2013274472 A1 US2013274472 A1 US 2013274472A1
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crystal
temperature
preparation
water
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Keiko Takakura
Namika Nakamatsu
Sakiko Takeshima
Sayuri Uehara
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Toyama Chemical Co Ltd
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Toyama Chemical Co Ltd
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Assigned to TOYAMA CHEMICAL CO., LTD. reassignment TOYAMA CHEMICAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKAMATSU, NAMIKA, TAKAKURA, KEIKO, TAKESHIMA, SAKIKO, UEHARA, SAYURI
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D241/00—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings
    • C07D241/02—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings
    • C07D241/10—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D241/14—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D241/24—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00—Medicinal preparations characterised by special physical form
    • A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
    • A61K9/19—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles lyophilised, i.e. freeze-dried, solutions or dispersions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A61P31/14—Antivirals for RNA viruses
    • A61P31/16—Antivirals for RNA viruses for influenza or rhinoviruses
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
    • C07B2200/00—Indexing scheme relating to specific properties of organic compounds
    • C07B2200/13—Crystalline forms, e.g. polymorphs

Definitions

  • the present invention relates to a crystal of sodium salt of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide (hereinafter referred to as “Compound A”), an injectable preparation containing the same, and a process thereof.
  • Compound A 6-fluoro-3-hydroxy-2-pyrazinecarboxamide
  • pandemic has been caused by H1N1 influenza virus, and occurrence of pandemic by a further virulent virus in the future is a concern.
  • Oseltamivir cannot be administered to patients having difficulty in oral administration. It is difficult to administer Zanamivir to children and aged persons. It takes a long time to administer Peramivir. Amantadine is ineffective against Type B influenza virus and resistant viruses have emerged.
  • Laninamivir is an inhalation drug, which is not suitable to patients with dementia and a severe disease, and it is difficult to administer it to children.
  • a further superior therapeutic agent for influenza has been desired.
  • an injection that can be administered to patients having difficulty in oral administration, children, and aged persons has been desired.
  • Compound A or a salt thereof has a superior antiviral activity and is useful as a therapeutic agent for viral infection (PATENT DOCUMENT 2).
  • PATENT DOCUMENT 2 Compound A has low solubility in water, and thus an injection of Compound A or a salt thereof has not been known yet.
  • the present inventors prepared an aqueous solution of a sodium salt of Compound A by using sodium hydroxide generally used as a base, and then produced a lyophilized preparation in accordance with a common method, for improving the water solubility of Compound A.
  • the sodium salt of Compound A obtained by this process was an amorphous dry powder, thus quick dissolution thereof in water was expected.
  • the obtained lyophilized preparation was a lyophilized cake having poor solubility, and required a long time to dissolve.
  • the amorphous lyophilized preparation of a sodium salt of Compound A was a preparation needing a long time to dissolve, and was difficult to handle with significant loss of convenience in use.
  • the present inventors have intensively conducted studies with the view to attaining the above desire. As a result, they have found that
  • Salt A sodium salt of Compound A
  • dissolution rate of a crystal of Salt A and the dissolution rate of a milled crystal of Salt A are significantly high
  • a preparation containing a crystal of Salt A and/or a milled crystal of Salt A is superior in solubility.
  • a crystal of Salt A can be produced by precipitating a crystal from a solution of Salt A.
  • the crystal has high solubility and significantly high dissolution rate in water.
  • a preparation containing a crystal of Salt A is superior in solubility and useful as an injectable preparation.
  • a milled crystal of Salt A has high solubility and significantly high dissolution rate in water.
  • a preparation containing a milled crystal of Salt A is superior in solubility and useful as an injectable preparation.
  • a powder filling method is known as a technique for filling a vial, etc. with a powder.
  • a powder filling method it is difficult to accurately control the filler content, and contamination with minute foreign bodies occurs easily, when compared to a method that divides a solution into small portions. For these reasons, as a process for producing a solid injection, a process by lyophilization is the most reliable process.
  • a lyophilized preparation of a crystal of Salt A having significantly high dissolution rate can be produced in a short crystallization time by controlling the concentration range, the pH range, and the temperature (crystallization temperature) range in a temperature-increasing step after primary freezing in lyophilization of an aqueous solution of Salt A to be subjected to lyophilization.
  • a crystal of Salt A can be produced by providing a step of increasing temperature after the primary freezing of lyophilization.
  • the resultant crystal has high solubility in water and significantly high dissolution rate, even though it is not milled. Therefore, the preparation containing the crystal is superior in solubility and useful as an injectable preparation.
  • the crystal of Salt A of the present invention does not change to an amorphous state even if a dehydration operation is applied during lyophilization.
  • a lyophilized preparation of Salt A of the present invention has significantly higher dissolution rate and much higher stability, compared to the amorphous lyophilized preparation.
  • a superior lyophilized preparation of a crystal of Salt A can be produced according to the process of the present invention.
  • the lyophilized preparation can be easily maintained in aseptic conditions and from which insoluble foreign bodies can be easily removed. Therefore, the lyophilized preparation is an injection superior in usability.
  • the present invention is as follows:
  • a process for producing a lyophilized preparation containing a crystal of Salt A including the following steps: (1) cooling an aqueous solution containing Salt A to produce a frozen product, (2) increasing the temperature of the frozen product, (3) further cooling the frozen product, and (4) carrying out lyophilization.
  • the process can produce a lyophilized preparation of a crystal of Salt A which has significantly high dissolution rate in a short crystallization time. 5.
  • the process according to 4 above wherein the achieving temperature of the frozen product falls within the range of ⁇ 15 to ⁇ 5° C. in the step of increasing the temperature of the frozen product.
  • a further superior lyophilized preparation of a crystal of Salt A can be produced.
  • a crystal of Salt A of the present invention is superior in solubility in water and useful as a drug substance of an injectable preparation.
  • a preparation containing a crystal of Salt A of the present invention is useful as an injectable preparation that is superior in solubility and stability.
  • the process for producing a crystal of Salt A of the present invention is useful as a process for producing a lyophilized preparation of a crystal of Salt A that is superior in solubility and stability.
  • Compound A can be produced by a method described, for example, in PATENT DOCUMENT 2.
  • Compound A has a tautomer: 6-fluoro-3-oxo-3,4-dihydro-2-pyrazinecarboxamide. This tautomer is included in the present invention.
  • a crystal of Salt A of the present invention and an injectable preparation containing a crystal of Salt A can be produced, for example, according to the following processes.
  • a crystal of Salt A Hydrate 1 can be produced by adding Compound A and base to water, heating the mixture to dissolve, adding 2-propanol, and collecting a precipitated crystal by filtration.
  • the amount of water is satisfactorily 1 to 50 times (v/w), and preferably 5 to 10 times (v/w) as large as that of Compound A.
  • Examples of base include sodium hydroxide, sodium carbonate, and sodium hydrogen carbonate.
  • the amount of base is satisfactorily 1.0 equivalent or more, and preferably 1.0 to 1.5 equivalent of Compound A.
  • the temperature of the reaction with base is satisfactorily 30 to 100° C., and preferably 40 to 80° C.
  • the amount of 2-propanol is satisfactorily 5 to 100 times (v/w), and preferably 10 to 30 times (v/w) as large as that of Compound A.
  • An injectable preparation can be produced by filling a vial, etc. with the crystal of Salt A Hydrate 1 and/or the milled crystal of Salt A Hydrate 1 thus obtained.
  • a crystal of Salt A Hydrate 2 can be produced by adding Compound A and base to water, dissolving the mixture, cooling the aqueous solution, and collecting a precipitated crystal by filtration.
  • the amount of water is satisfactorily 1 to 50 times (v/w), and preferably 5 to 20 times (v/w) as large as that of Compound A.
  • Examples of base include sodium hydroxide, sodium carbonate, and sodium hydrogen carbonate.
  • the amount of base is satisfactorily 0.8 to 2 equivalent, and preferably 0.9 to 1.1 equivalent of Compound A.
  • the temperature of the reaction with base is satisfactorily 0 to 100° C., and preferably 5 to 40° C.
  • the cooling temperature of crystallization operation is satisfactorily 0 to 20° C., and preferably 0 to 5° C.
  • An injectable preparation can be produced by filling a vial, etc. with the crystal of Salt A Hydrate 2 and/or the milled crystal of Salt A Hydrate 2 thus obtained.
  • a crystal of Salt A anhydrate can be produced by allowing a crystal of Salt A Hydrate 2 to stand still at ⁇ 20 to 60° C. under reduced pressure.
  • the standstill time is satisfactorily 0.5 to 120 hours, and preferably 1 to 72 hours.
  • the degree of pressure reduction is not particularly limited; however, it is satisfactorily 100 Pa or below, and preferably 50 Pa or below.
  • a crystal of Salt A anhydrate can be produced by allowing a crystal of Salt A Hydrate 2 to stand still under heating.
  • the heating temperature is satisfactorily 30° C. or above, preferably 50° C. to 300° C., and more preferably 50° C. to 150° C.
  • An injectable preparation can be produced by filling a vial, etc. with the crystal of Salt A anhydrate and/or the milled crystal of Salt A anhydrate thus obtained.
  • an injectable preparation of a Salt A anhydrate can be produced by grinding the crystal of Salt A Hydrate 2 and then drying it in the same manner as mentioned above.
  • a frozen product can be obtained by freezing an aqueous solution of Compound A and base.
  • the amount of water is satisfactorily 10 to 100 times (v/w), and preferably 10 to 50 times (v/w) as large as that of Compound A.
  • base examples include sodium hydroxide, sodium carbonate, and sodium hydrogen carbonate. These may be used alone or as a mixture of two or more types.
  • the pH of the aqueous solution is satisfactorily 4.0 to 10, and preferably 6.5 to 8.5.
  • the temperature of the primary freezing step is satisfactorily a collapse temperature or below, and preferably ⁇ 60 to ⁇ 30° C.
  • the period of time for the primary freezing step is satisfactorily 1 to 10 hours, and preferably 2 to 5 hours.
  • the temperature of the frozen product is increased and the frozen product is maintained for a preset time (annealing) to allow crystallization to proceed to obtain a crystalline frozen product.
  • the temperature, at which thawing of the frozen product dose not occur and crystallization proceeds to the extent that the frozen product maintains a frozen state, may be satisfactory in the annealing step; preferably ⁇ 20 to ⁇ 2° C., and more preferably ⁇ 15 to ⁇ 5° C.
  • the period of time for maintaining the annealing step is satisfactorily 0.5 to 48 hours, and preferably 1 to 24 hours.
  • the temperature of the secondary freezing step is preferably ⁇ 60 to ⁇ 30° C.
  • the period of time for the secondary freezing step is satisfactorily 1 to 10 hours, and preferably 1 to 5 hours.
  • pressure reduction treatment can be performed to produce a lyophilized preparation.
  • This step can be performed in accordance with a lyophilization method usually used, for example, in two steps, i.e., a primary drying step and a secondary drying step.
  • the primary drying step is carried out under reduced pressure while product temperature is maintained at the eutectic point or below; however, since the temperature drops as the moisture sublimates from the frozen product, the preset temperature of apparatus may be the eutectic point or above.
  • the temperature of the frozen product is satisfactorily ⁇ 40 to ⁇ 3° C., and preferably ⁇ 30 to ⁇ 5° C.
  • the preset temperature of apparatus is satisfactorily ⁇ 20 to 60° C., and preferably ⁇ 10 to 50° C.
  • the degree of pressure reduction in the primary drying step is not particularly limited; however, it is satisfactorily 100 Pa or below, and preferably 50 Pa or below.
  • the rate of temperature decrease becomes slower.
  • the product temperature increases and becomes almost equal to the preset temperature.
  • the primary drying step is determined to have completed.
  • the secondary drying step is carried out at room temperature or more, and preferably 30 to 60° C.
  • the degree of pressure reduction is preferably enhanced in order to accelerate removal of water.
  • the degree of pressure reduction is satisfactorily 0.5 to 50 Pa, and preferably 1 to 5 Pa.
  • the secondary drying step may be satisfactorily carried out up until the point where the product temperature becomes almost equal to the preset temperature and a product temperature virtually does not change.
  • the powder X-ray diffraction pattern of a crystal of Salt A produced by the process was the same as the powder X-ray diffraction pattern of a crystal of Salt A anhydrate produced in process 3. That is, a lyophilized preparation of a crystal of Salt A anhydrate can be produced by the use of the process.
  • a sterilization treatment or the like may be carried out in accordance with the procedure usually employed.
  • the lyophilized preparation since no organic solvents are used, the lyophilized preparation has no residual solvent.
  • the lyophilized preparation of the present invention is not harmful to a human body.
  • powder X-ray diffraction measurement conditions are as follows.
  • the characteristic peaks of powder X-ray diffraction sometimes varies depending on measurement conditions.
  • 2 ⁇ has a margin of error of ⁇ 0.2°.
  • the diffraction angle of X° represented by 2 ⁇ refers to “a diffraction angle of ((X ⁇ 0.2) to (X+0.2))° represented by 2 ⁇ ”.
  • the crystal of Salt A of the present invention includes a crystal of Hydrate 1, a crystal of Hydrate 2, and a crystal of an anhydrate. Furthermore, various shapes of crystals are included in the crystal.
  • Additives can be added to the lyophilized preparation containing Salt A of the present invention for improving solubility.
  • the temperature range of the annealing step can be extended by adding additives.
  • additives examples include amino acids, polyethers, saccharides, sugar alcohols, salts, urea, ethyl urea, creatinine, nicotinic acid amide, trometamol, purified soybean lecithin, egg albumin, bovine serum albumin, and polysorbates. These may be used alone or as a mixture of two or more types.
  • amino acids examples include glycine, L-alanine, L-phenylalanine, L-valine, L-leucine, L-isoleucine, taurine, DL-methionine, L-threonine, L-glutamine, sodium L-glutamate, acetyltryptophan, and L-histidine.
  • L-alanine, L-phenylalanine, L-valine, L-leucine, L-isoleucine, taurine, DL-methionine, L-glutamine, and L-histidine are more preferable, and L-leucine, L-isoleucine, and L-valine are further preferable.
  • polyethers examples include polyethylene glycol 300, polyethylene glycol 400, polyethylene glycol 600, and polyethylene glycol 4000. Polyethylene glycol 400 is more preferable.
  • saccharides examples include trehalose, maltose, glucose, lactose, purified white sugar, fructose, dextran 40, and cyclodextrin. Dextran 40 is more preferable.
  • sugar alcohols examples include D-sorbitol, xylitol, inositol, and D-mannitol.
  • salts examples include sodium acetate, sodium lactate, sodium L-tartrate, sodium citrate, sodium salicylate, sodium benzoate, and sodium caprylate.
  • polysorbates examples include polysorbate 20 and polysorbate 80.
  • Polysorbate 80 is more preferable.
  • preferable additives include amino acids, polyethers, saccharides, urea, and polysorbates.
  • solubility of a lyophilized preparation can be improved by controlling the pH of an aqueous solution of Compound A and base.
  • the pH of the aqueous solution of Compound A and base is satisfactorily 4.0 to 10, preferably 6.5 to 8.5, and more preferably 6.5 to 7.5.
  • additives such as an osmo-regulator, a pH regulator, a buffer, a solubilizer, a stabilizer, a surfactant, a soothing agent, and/or a preservative, may be added to the preparation of the present invention.
  • osmo-regulator examples include sodium chloride, glycerin, and propylene glycol.
  • Examples of the pH regulator and/or the buffer include acids such as hydrochloric acid, phosphoric acid, sulfuric acid, methanesulfonic acid, acetic acid, lactic acid, maleic acid, citric acid, tartaric acid, ascorbic acid, and benzoic acid; salts such as sodium bicarbonate, sodium carbonate, sodium dihydrogenphosphate, potassium dihydrogenphosphate, disodium hydrogenphosphate, dipotassium hydrogenphosphate, trisodium phosphate, disodium citrate, sodium deoxycholate, and sodium sulfite; and bases such as sodium hydroxide, trometamol, monoethanolamine, diethanolamine, triethanolamine, L-arginine, and L-lysine.
  • acids such as hydrochloric acid, phosphoric acid, sulfuric acid, methanesulfonic acid, acetic acid, lactic acid, maleic acid, citric acid, tartaric acid, ascorbic acid, and benzoic acid
  • salts such as sodium bicarbonate, sodium carbon
  • solubilizer examples include Macrogol and purified soybean lecithin.
  • the stabilizer examples include sodium hydrogen sulfite, sodium pyrosulfite, potassium pyrosulfite, sodium pyrophosphate, sodium thiosulfate, sodium metasulfobenzoate, sodium formaldehyde sulfoxylate, ethylene diamine, edetate sodium, thioglycolic acid, sodium gluconate, potassium L-glutamate, L-lysine-L-glutamate, sodium chondroitin sulfate, albumin, L-aspartic acid, L-cysteine, and dibutylhydroxytoluene.
  • surfactant examples include, sorbitan fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan monolaurate, polyoxyethylene polyoxypropylene glycol, and polysorbate.
  • Examples of the soothing agent include lidocaine, procaine, meprylcaine, and benzyl alcohol.
  • preservative examples include cresol, phenol, methyl paraoxybenzoate, ethyl paraoxybenzoate, benzalkonium chloride, and benzethonium chloride.
  • the dose of an active ingredient is appropriately determined in accordance with dosage form, age and gender of a patient, conditions of a disease, and other conditions; however, usually 0.1 to 100 mg/kg per adult per day may be administered.
  • the content of Compound A is 10 to 6000 mg, and preferably 100 to 2000 mg.
  • the content of the additives to be added for improving solubility is 0.1 to 100% (w/w), and preferably 3 to 50% (w/w) relative to the content of Compound A.
  • the water content was measured by the Karl Fischer method.
  • the obtained crystal (100.5 mg) was dissolved to distillated water (120 mL), and then potentiometric titration was conducted by using 0.1 mol/L hydrochloric acid. As a result, a crystal of monosodium salt was obtained.
  • thermogravimetric analysis of the crystal is shown in FIG. 4 .
  • Weight of water (0.5 equivalent) was decreased at 136 to 201° C.
  • Example 2 The crystal obtained in Example 1 was milled to obtain a powder. Each vial was filled with the powder (718 mg) to obtain an injectable preparation.
  • thermogravimetric analysis of the crystal is shown in FIG. 5 and FIG. 6 .
  • thermogravimetric analysis was conducted at the temperature increase rate of 5° C./min.
  • Weight of water (1.5 equivalent) was decreased at 70 to 84° C. ( FIG. 5 ).
  • Weight of water (2.0 equivalent) was decreased at 30 to 97° C., ( FIG. 6 ).
  • Salt A Hydrate 2 was found to be a dihydrate.
  • Example 3 The crystal obtained in Example 3 was milled to obtain a powder. Each vial was filled with the powder (787 mg) to obtain an injectable preparation.
  • Example 3 The crystal (400 mg) obtained in Example 3 was allowed to stand still at 40° C. under vacuum (50 Pa or below) for 64 hours to obtain a crystal of an anhydrate.
  • the powder X-ray diffraction pattern of the lyophilized preparation was identical with that of example 5.
  • Vials were cooled at a shelf temperature of ⁇ 60° C. to freeze the content. 2. The temperature of the vials was increased to a shelf temperature of ⁇ 5° C. and the vials were maintained at the same temperature for 24 hours. 3. The temperature of the vials was cooled to a shelf temperature of ⁇ 55° C. or below and the vials were maintained at the same temperature for 2 hours. 4. The temperature of the vials was increased to a shelf temperature of 10° C. under vacuum (50 Pa or below) and the vials were maintained at the same pressure and temperature for 30 hours. 5. The temperature of the vials was increased to a shelf temperature of 20° C. and the vials were maintained at the same pressure and temperature for 2 hours. 6. The temperature of the vials was increased to a shelf temperature of 40° C. and the vials were maintained at the same pressure and temperature for 12 hours.
  • the powder X-ray diffraction pattern of the lyophilized preparation was identical with that of example 5.
  • Vials were cooled at a shelf temperature of ⁇ 60° C. to freeze the content. 2. The temperature of the vials was increased to a shelf temperature of ⁇ 10° C. and the vials were maintained at the same temperature for 24 hours. 3. The temperature of the vials was cooled to a shelf temperature of ⁇ 55° C. or below and the vials were maintained at the same temperature for 2 hours. 4. The temperature of the vials was increased to a shelf temperature of 10° C. under vacuum (50 Pa or below) and the vials were maintained at the same pressure and temperature for 48 hours. 5. The temperature of the vials was increased to a shelf temperature of 20° C. and the vials were maintained at the same pressure and temperature for 2 hours. 6. The temperature of the vials was increased to a shelf temperature of 40° C. and the vials were maintained at the same pressure and temperature for 20 hours.
  • the powder X-ray diffraction pattern of the lyophilized preparation was identical with that of example 5.
  • Vials were cooled at a shelf temperature of ⁇ 60° C. to freeze the content. 2. The temperature of the vials was increased to a shelf temperature of ⁇ 15° C. and the vials were maintained at the same temperature for 24 hours. 3. The temperature of the vials was cooled to a shelf temperature of ⁇ 55° C. or below and the vials were maintained at the same temperature for 2 hours. 4. The temperature of the vials was increased to a shelf temperature of 10° C. under vacuum (50 Pa or below) and the vials were maintained at the same pressure and temperature for 24 hours. 5. The temperature of the vials was increased to a shelf temperature of 20° C. and the vials were maintained at the same pressure and temperature for 2 hours. 6. The temperature of the vials was increased to a shelf temperature of 40° C. and the vials were maintained at the same pressure and temperature for 12 hours.
  • the powder X-ray diffraction pattern of the lyophilized preparation was identical with that of example 5.
  • Vials were cooled at a shelf temperature of ⁇ 60° C. to freeze the content. 2. The temperature of the vials was increased to a shelf temperature of ⁇ 10° C. and the vials were maintained at the same temperature for 24 hours. 3. The temperature of the vials was cooled to a shelf temperature of ⁇ 55° C. and the vials were maintained at the same temperature for 2 hours. 4. The temperature of the vials was increased to a shelf temperature of 40° C. under vacuum (50 Pa or below) and the vials were maintained at the same pressure and temperature for 70 hours.
  • Vials were cooled at a shelf temperature of ⁇ 60° C. to freeze the content.
  • the temperature of the vials was increased to a shelf temperature of ⁇ 10° C. and the vials were maintained at the same temperature for 24 hours.
  • the temperature of the vials was cooled to a shelf temperature of ⁇ 55° C. or below and the vials were maintained at the same temperature for 2 hours.
  • the temperature of the vials was increased to a shelf temperature of 10° C. under vacuum (50 Pa or below) and the vials were maintained at the same pressure and temperature for 85 hours.
  • the temperature of the vials was increased to a shelf temperature of 20° C. and the vials were maintained at the same pressure and temperature for 2 hours.
  • the temperature of the vials was increased to a shelf temperature of 40° C. and the vials were maintained at the same pressure and temperature for 20 hours.
  • Vials were cooled at a shelf temperature of ⁇ 60° C. to freeze the content.
  • the temperature of the vials was increased to a shelf temperature of ⁇ 10° C. under vacuum (50 Pa or below) and the vials were maintained at the same pressure and temperature for 37 hours.
  • the temperature of the vials was increased to a shelf temperature of 0° C. and the vials were maintained at the same pressure and temperature for 9 hours.
  • the temperature of the vials was increased to a shelf temperature of 10° C. and the vials were maintained at the same pressure and temperature for 4 hours.
  • the temperature of the vials was increased to a shelf temperature of 20° C. and the vials were maintained at the same pressure and temperature for 4 hours.
  • the temperature of the vials was increased to a shelf temperature of 40° C. and the vials were maintained at the same pressure and temperature for 15 hours.
  • Vials were cooled at a shelf temperature of ⁇ 60° C. to freeze the content. 2. The temperature of the vials was increased to a shelf temperature of 50° C. under vacuum (50 Pa or below) and the vials were maintained at the same pressure and temperature for 39 hours.
  • the dissolution time of an amorphous product was 60 seconds.
  • the dissolution time of an amorphous product was 65 seconds.
  • milled Hydrate 1 Example 2
  • milled Hydrate 2 Example 4
  • the milled crystals exhibited more superior solubility than the amorphous product.
  • the dissolution time of preparation (Example 7) produced by lyophilization including an annealing step was 25 seconds.
  • the preparation produced by this process exhibited more superior solubility than the amorphous product even though it is not milled.
  • Example 9 The dissolution time of preparation (Example 9) produced by lyophilizing a solution adjusted to pH 7.0 in the same manner as in Example 7 was 22 seconds.
  • the preparation in Example 9 exhibited much more superior solubility than the preparation in Example 7.
  • the dissolution time of preparation (Example 10) produced by lyophilizing a solution (24 mL) adjusted to pH 8.5 according to the process of Example 7 was 26 seconds.
  • the dissolution time of preparation (Example 11) produced by lyophilizing a solution (24 mL) adjusted to pH 7.0 was 14 seconds.
  • the dissolution time of preparation (Example 12) produced by lyophilizing a solution (24 mL) adjusted to pH 6.5 was 13 seconds.
  • the dissolution time was shortened by reducing pH value.
  • the dissolution time of preparation (Example 13) containing L-leucine as additives and produced by lyophilizing a solution (24 mL) adjusted to pH 8.5 was 19 seconds.
  • the dissolution time of preparation (Example 13) was shorter than that of preparation (Example 10) not containing L-leucine.
  • the dissolution time of preparations (Examples 14 to 16) produced by reducing pH value was 6 to 13 seconds.
  • the dissolution time was shortened by reducing pH value.
  • the dissolution time of preparations containing amino acids as additives (Examples 17 to 27), preparation containing urea as additives (Example 28), preparation containing polysorbate 80 as additives (Example 29), preparation containing polyethylene glycol 400 as additives (Example 30), and preparation containing dextran 40 as additives (Example 31) all fall within the range of 20 seconds, and these preparations exhibit much more superior solubility than an amorphous product.
  • FIG. 1 is a powder X-ray diffraction pattern of a crystal of a sodium salt (Hydrate 1) of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide;
  • FIG. 2 is a powder X-ray diffraction pattern of a crystal of a sodium salt (Hydrate 2) of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide;
  • FIG. 3 is a powder X-ray diffraction pattern of a crystal of a sodium salt (anhydrate) of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide;
  • FIG. 4 is a thermogravimetric analysis pattern of a crystal of a sodium salt (Hydrate 1) of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide;
  • FIG. 5 is a thermogravimetric analysis pattern of a crystal of a sodium salt (Hydrate 2) of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide (weight of water (1.5 equivalent) was decreased);
  • FIG. 6 is a thermogravimetric analysis pattern of a crystal of a sodium salt (Hydrate 2) of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide (weight of water (2 equivalent) was decreased);
  • a preparation filled with a crystal of a sodium salt of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide of the present invention is superior in solubility and useful as an injectable preparation.

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