Injectable solution containing a pyridyl methylsulfinylbenzimidazole

Abstract

An injectable solution of a compound useful as an anti-ulcer agent of the formula; ##STR1## wherein R.sup.1 represents hydrogen, methoxy or trifluoromethyl group; R.sup.2 and R.sup.3, being the same as or different from each other, represent hydrogen or methyl group; and R.sup.4 represents a fluorinated C.sub.2 to C.sub.5 lower alkyl group, is provided by dissolving the compound in at least one of ethanol, propylene glycol and polyethylene glycol; or by dissolving the freeze-dried material of an alkaline aqueous solution of the compound in a mixture of an acidic substance and at least one of the above solvents.

Description

This invention relates to injectable solutions containing pyridine derivatives (hereinafter referred to, in some instances, as "Compound (I)") of the below-described formula which are useful as an anti-ulcer agent: ##STR2## wherein R.sup.1 represents hydrogen, methoxy or trifluoromethyl group, R.sup.2 and R.sup.3, each being the same as, or different from, the other, represent hydrogen or methyl group; and R.sup.4 represents fluorinated C.sub.2 to C.sub.5 lower alkyl group.

There have been known injectable solutions (refer to The European Unexamined Patent Publication No. 124495), which are obtained by dissolving omeprazole sodium having anti-ulcer activity in sterilized water, followed by filtration and lyophilization to give a lyophilized material, which is then dissolved in a sterile-filtered mixed solution of polyethylene glycol 400 for injection, sodium dihydrogenphosphate and sterilized water.

In developing injectable solutions of Compound (I), there are encountered some problems being attributable to its characteristic properties.

Among the species Compound (I), for example, 2-(3-methyl-4-trifluoroethoxy-2-pyridyl)methylsulfinylbenzimidazole (hereinafter referred to briefly as "Compound (I-1) shows a certain degree of solubility in water but only in the strongly alkaline region of pH 11 or more, with an extremely low solubility in the pH range below pH 11 (33 mg/ml at pH 13, 1 mg/ml at pH 11 and 0.06 to 0.01 mg/ml at pH 9 to 3). Referring to the stability in an aqueous solution, Compound (I-1) is satisfactorily stable in an alkaline solution, but becomes less stable as the pH of the aqueous solution is decreased to the neutral to acidic range, while the resulting solution turns in appearance dark purple in a short period of time.

Thus Compound (I), because of its characteristic properties as described above, has been difficult to process into the dosage form of injectable solution at the physiologically allowable pH range using water alone as a solvent and without employing a sophisticated processing technique, because injectable solutions favorably exhibit a pH value not being far from neutrality in terms of hemolysis, pain or local irritation.

In view of these circumstances described above, the present inventors, after extensive investigation, found that Compound (I) is very soluble in solvents, such as ethanol, propylene glycol and polyethylene glycol, with its stability in said solvents being excellent, and that the powder produced by lyophilizing an alkaline solution of Compound (I) does not tend to discolor with length of time elapsed and is extremely soluble in the above solvents, and the findings, coupled with further research, have culminated into the present invention.

Thus, the present invention is directed to; (1) injectable solutions containing (a) a compound of the formula (I): ##STR3## wherein R.sup.1 represents hydrogen, methoxy or trifluoromethyl, R.sup.2 and R.sup.3, each being the same as, or different from, the other, represent hydrogen or methyl; and R.sup.4 represents fluorinated C.sub.2 to C.sub.5 lower alkyl and (b) at least one solvent selected from the group consisting of ethanol, propylene glycol and polyethylene glycol; and (2) Injectable solutions consisting of a lyophilized material of an alkaline solution of Compound (I) being dissolved in a mixed solution composed of (a) an acid substance and (b) at least one solvent selected from the group consisting of ethanol, propylene glycol and polyethylene glycol.

In the above-described formula, examples of the fluorinated C.sub.2 to C.sub.5 lower alkyl group represented by R.sup.4 include 2,2,2-trifluoroethyl, 2,2,3,3,3-pentafluoropropyl, 2,2,3,3-tetrafluoropropyl, 1,1,1-trifluoromethyl, 2,2,2-trifluoroethyl, 2,2,3,3,4,4,4-heptafluorobutyl, 2,2,3,3,4,4,5,5-octafluoropentyl and the like. In the above formula, preferably, R.sup.1 and R.sup.3 are hydrogen, and R.sup.2 is methyl, with R.sup.4 being 2,2,2-trifluoroethyl.

It is to be noted that the above-mentioned Compound (I) is a known compound as described in The European Unexamined Patent Publication No. 174726.

As the said polyethylene glycol, there can be used polyethylene glycols having varied average molecular weights, and favorably usable are those having preferably an average molecular weight of 100 to 600.

In the present invention, in cases where ethanol, propylene glycol and polyethylene glycol are used as an admixture of more than two kinds, their mutual mixing ratio may be in any proportions.

When water is contained in the solvent, an increased proportion of water in the total volume of solvent results in a lowered solubility of Compound (I); particularly in the case of Compound (I) being dissolved in the solvent composed of ethanol and water, the dissolved Compound (I) in some instances separates out with lapse of time, and consequently, the proportion of water in the total volume of solvent is desirably not more than 80 % (V/V).

The injectable solutions according to the present invention can be obtained by dissolving Compound (I) in the form of amorphous powder or crystalline powder in the above-mentioned solvent, but it is preferable to dissolve a lyophilized material of an alkaline aqueous solution of Compound (I) in a mixed solution composed of an acidic and the above-mentioned solvent.

As the alkaline aqueous solution of Compound (I), there may be mentioned, for example, an aqueous solution produced by dissolving in water Compound (I) in conjunction with a strongly basic substance such as sodium hydroxide, potassium hydroxide, sodium carbonate, arginine and N-methylglucamine, and adjusting the resulting solution to a pH of not less than 11, preferably not less than 12.

Among the strong basic substances, sodium hydroxide is particularly preferred.

The concentration of Compound (I) in the said alkaline aqueous solution may be of any concentration only if it permits lyophilization, and is preferably 2 to 30 mg/ml, more preferably 5 to 30 mg/ml.

In order to provide the resulting lyophilized material with improved solid-forming property, it is preferred to add to the alkaline aqueous solution sucrose, lactose, neutral amino acids, such as glycine, alanine, proline, valine and methionine, inorganic salts, such as sodium succinate, and the like, These additives can be employed usually in an amount of 0.2 to 5 mg, preferably 0.5 to 3 mg, per mg of Compound (I).

Among these solid-forming agents, mannitol and glycine are preferable, with mannitol being particularly preferred.

The said lyophilized material can be produced by lyophilizing the alkaline aqueous solution of Compound (I) by use of a method known per se, and in general, lyophilization is preferably carried out by means of a method which comprises freezing the solution at a temperature of below -25.degree. C. and drying the frozen material on plates in a dryer by warming the plates up to 25.degree. C. or 40.degree. C. at a rate of 5.degree. to 20.degree. C./hr while keeping the degree of vacuum in the dryer at not more than about 0.1 Torr.

The lyophilized material obtained in this manner produces the appearance of white lump form or powder form, and hardly varies in appearance with length of time elapsed, thereby offering the advantageous characteristic that Compound (I) can be preserved stable for a prolonged period of time.

The said lyophilized material contains a strongly basic substance which has been incorporated therein, therefore, when dissolved in the abovementioned solvent, the material produces a solution with a strong alkalinity. In order to adjust the pH of the solution to a physiologically allowable range, it is preferable to incorporate into the above-mentioned solvent a specifically determined amount of an acidic substance as a pH adjusting agent. Examples of the acidic substance include inorganic acids, such as hydrochloric acid and phosphoric acid, and organic acids, such as sccinic acid and tartaric acid, as well as sodium dihydrogenphosphate, glycine, etc. Among others, hydrochloric acid or sodium dihydrogenphosphate is preferable.

Incidentally, when the pH of the solvent is stabilized by utilizing the buffer capacity of the acidic substance, it is preferable to adjust the pH to desired range by adding a suitable amount of sodium hydroxide etc. thereto, if necessary.

Also, it is desirable to incorporate the acidic substance in such a way that the pH of the injectable solution of this invention may be adjusted finally to 7 to 11.

Employing the said solvent having the above-mentioned acidic substance admixed can permit the lyophilized material containing Compound (I) to be dissolved quickly, and it is preferable to dissolve or dilute the material on the occasion of use.

As the injectable solution of this invention, there may be employed a liquid composition having Compound (I) in conjunction with a strongly basic substance like the previously mentioned ones dissolved in the above-described solvent, which is to be diluted with a solvent being admixed with the above-mentioned acidic substance on the occasion of use to adjust its pH to the physiologically allowable range (ca. 7 to 11).

The injectable solutions thus prepared desirably have the concentration of Compound (I) of 0.1 to 20 mg/ml, particularly 2 to 10 mg/ml.

In addition, it is preferable to incorporate the injectable solution according to the present invention with additives, including buffer solutions for the stabilization of its pH, such as arginine, N-methylglucamine, glycine, sodium dihydrogenphosphate, disodium hydrogenphosphate, isotonizing agents for the adjustment of its osmotic pressure, such as sodium chloride, stabilizers, such as sodium hydrogensufite, pain-relieving agents, such as glucose, sorbitol, mannitol, benzyl alcohol, mepivacaine hydrochloride and xylocaine hydrochloride, and preservatives, such as methyl p-oxybenzoate, propyl p-oxybenzoate, thymelosal and chlorobutanol, as the case may be. These substances can added usually in an amount of 0.2 to 10 mg, preferably 0.5 to 5 mg, per mg of Compound (I).

In order to enhance the solubility of Compound (I), also there can be incorporated sodium chloride, magnesium chloride and potassium chloride. The amount of these salts in the formulation is usually 1 to 30 mg, preferably 3 to 15 mg, per mg of Compound (I).

The injectable solution of this invention is preferably prepared normally by means of the sterile preparation method known per se.

It is preferable to administer usually the said injectable solution intravenously, and its dosage amount is desirably selected in such a way that it may be 5 to 100 mg of Compound (I) daily for male adults, preferably 10 to 50 mg.

In the injectable solution of this invention, the use of at least one of ethanol, propylene glycol and polyethylene glycol as a solvent renders Compound (I) soluble in water and can contribute to the provision of desired stability to Compound (I). Consequently, it becomes possible to have Compound (I) demonstrate its excellent anti-ulcer activity in an adequate manner.

Below described are the examples to illustrate this invention specifically, but these are not to be understood to limit the scope of this invention.

EXAMPLE 1

Compound (I-1) was dissolved in ethanol and propylene glycol to the concentration of 2 mg/ml, respectively, and the resulting solutions were sterile filtered and filled in 5-ml portions into ampoules of a 5-ml capacity, followed by sealing.

The test specimens as filled into the ampoules were investigated for appearance, clarity and content of Compound (I) immediately after preparation and after storage at 25.degree. C. for 24 hours, with the results being shown in Table 1. The test specimens prepared by dissolution in ethanol and propylene glycol were observed to produce a slight change in appearance after storage at 25.degree. C. for 24 hours, but the changes were judged to be so slight that they might in no way influence the injectable solution. The test specimens were found to be stable in terms of content of the active ingredient.

TABLE 1______________________________________Stability of Compound (I-1) in the solution state:Compositionof test specimen Item of After After storage(in 1 ml) investigation preparation at 25.degree. C./24 hrs.______________________________________Compound (I-1): Appearance Colorless Yellowish2 mg Clarity Clear ClearEthanol: 1 ml Content* 100.0% 99.2%Compound (I-1): Appearance Colorless Light red-purple2 mg Clarity Clear ClearPropylene Content* 100.0% 103.0%glycol: 1 ml______________________________________ Note, *As measured by use of highperformance liquid chromatography (HPLC) whereby the content determined immediately after preparation was taken as 100.0% (the same method was employed for measurement in examples to be described in the following). chromatographic conditions of HPLC: Carrier; Nucleosil 5 C.sub.18 (supplied by GasChro Kogyo K.K. of Japan) 4.0 mm .times. 150 mm Solvent; Methanol:water:triethylamine (60:40:1, pH 7) Detection method; UV spectrophotometry at 285 nm

EXAMPLE 2

Ethanol, polyethylene glycol 400, propylene glycol and water were mixed at the composition ratios as shown in Table 2 illustrated below, and 2 mg of Compound (I-1) was dissolved in 1 ml each of the resulting solvents, respectively, followed by adjustment to pH 9.0 with 5N-aqueous sodium hydroxide solution. As a control, there were prepared a suspension of 2 mg of Compound (I-1) in 1 ml of water being adjusted to pH 9.0 with 5N-aqueous sodium hydroxide solution and an aqueous solution of 2 mg of Compound (I-1) in 1 ml of 0.01N aqueous sodium hydroxide solution. These solutions were sterile-filtered by the conventional method and were filled in 5-ml portions into ampoules of a 5-ml capacity, respectively, followed by sealing.(A control of the suspension was not subjected to sterile-filtration). The test specimens as filled into ampoules were investigated for each item of appearance, pH and content immediately after preparation and after storage at 25.degree. C. for 24 hours, with the results being shown in Table 2.

As may be evident, from Table 2, all of the test specimens, except the controls, were observed to produce a slight change in appearance after storage at 25.degree. C. for 24 hours, but the changes were judged to be so slight that they might in no way influence the injectable solution. In addition, the test specimens were found to show slight change in content. The control specimens, when adjusted to the same pH value as other test specimens, failed to allow adequate dissolution of Compound (I-1), and were needed to be adjusted to a pH of not less than 11 in order to secure dissolution.

TABLE 2______________________________________Stability of Compound (I-1) in the solution stateComposition Afterof test specimen Item prepar- After storage(in 1 ml) investigation ation at 25.degree. C./24 hrs.______________________________________Compound (I-1): Appearance Colorless Slightly to light2 mg green-yellowPEG-400*: 0.05 ml pH 9.0 --Ethanol: 0.35 ml Content 100.0% 98.0%Water: 0.6 mlCompound (I-1): Appearance Colorless Slightly to light2 mg green to yellowPEG-400: 0.05 ml pH 9.0 --Propylene glycol: Content 100.0% 94.4%0.35 mlWater: 0.6 mlCompound (I-1): Appearance Colorless Slightly to light2 mg green-yellowPEG-400: 0.4 ml pH 9.0 --Water: 0.6 ml Content 100.0% 91.8%Compound (I-1): Appearance Colorless Slightly to light2 mg red-purpleEthanol: 0.5 ml pH 9.0 --Propylene glycol: Content 100.0% 98.0%0.5 mlCompound (I-1): appearance White Slightly to light2 mg sus- grey suspension pensionWater: 1 ml pH 9.1 -- Content -- --Compound (I-1): Appearance Colorless Colorless2 mg0.01 N aq. sodium pH 11.4 --hydroxide sol'n.: Content 100.0% 92.5%1 ml______________________________________ Note, *Polyethylene glycol having an average molecular weight of 400.

EXAMPLE 3

Ethanol, polyethylene glycol 400, propylene glycol and water were mixed at the composition ratios as shown in Table 3 illustrated below, and 5-mg of Compound (I-1) was dissolved in 1 ml each of the resulting solvents, respectively, followed by adjustment to pH 9.0 with 5N-aqueous sodium hydroxide solution. As a control, there were prepared a suspension of 5 mg of Compound (I-1) in 1 ml of water being adjusted to pH 9.0 with 5N-aqueous sodium hydroxide solution and an aqueous solution of 5 mg of Compound (I-1) in 1 ml of 0.02N aqueous sodium hydroxide solution. These solutions were sterile-filtered by the conventional method and were filled in 5-ml portions into ampoules of a 5-ml capacity, respectively, followed by sealing. (A control of the suspension was not subjected to sterile-filtration).

These test specimens as filled into ampoules were investigated for each item of appearance, pH and clarity immediately after preparation and after storage at 25.degree. C. 24 hours, with the results being shown in Table 3.

As may be evident from Table 3, all of the test specimens, except the controls, were observed to produce a slight change in appearance after storage at 25.degree. C. for 24 hours, but the changes were judged to be so slight that they might in no way influence the injectable solution. In addition, they were observed to shown no change in clarity. The control specimens, when adjusted to the same pH value as other test specimens, failed to allow adequate dissolution of Compound (I-1), and were needed to be adjusted to a pH of not less than 11 in order to secure dissolution.

TABLE 3______________________________________Stability of Compound (I-1) in the solution stateComposition Afterof test specimen Item prepar- After storage(in 1 ml) investigation ation at 25.degree. C./24 hrs.______________________________________Compound (I-1): Appearance Colorless Slightly to light5 mg green-yellowEthanol: 0.6 ml pH 9.0 --water: Clarity Clear ClearCompound (I-1): Appearance Colorless Slightly to light5 mg green-yellowPEG-400*: 0.4 ml pH 9.0 --Water: 0.6 ml Clarity Clear ClearCompound (I-1): Appearance Colorless Slightly to light5 mg green-yellowEthanol: 0.3 ml pH 9.0 --Propylene glycol: Clarity Clear Clear0.3 mlWater: 0.4 mlCompound (I-1): Appearance Colorless Slightly to light5 mg green-yellowPEG-400: 0.3 ml pH 9.0 --Ethanol: 0.3 ml Clarity Clear ClearWater: 0.4 mlCompound (I-1): Appearance White Slightly to light5 mg sus- grey suspension pensionWater: 1 ml pH 8.9 -- Clarity -- --Compound (I-1): Appearance Colorless Colorless5 mg0.02 N aq. sodium pH 11.6hydroxide sol' n.: Clarity Clear Clear1 ml______________________________________

EXAMPLE 4

TABLE 5______________________________________Composition of the aqueous solution to befilled into vials (in 1 ml) No.Ingredient 1 2 3______________________________________Compound (I-1) 15 mg 15 mg 15 mgMannitol 15 mg 50 mg 15 mgSodium hydroxide 2.4 mg 2.4 mg 4.8 mgDistilled water Suitable volume to make up to the total of 1 ml.______________________________________ TABLE 6______________________________________Composition of the lyophilized vials (per vial) No.Ingredient V1 V2 V3______________________________________Compound (I-1) 30 mg 30 mg 30 mgMannitol 30 mg 100 mg 30 mgSodium hydroxide 4.8 mg 4.8 mg 9.6 mg______________________________________ TABLE 7______________________________________Compositions after being dissolved (per 10 ml)No.Ingredient S1 S2 S3 S4 S5______________________________________PEG-400 3000 mg 3000 mg 3000 mg 3000 mg 3000 mgSodium 90 mg 90 mg 90 mg 90 mg 90 mgchlorideN-methyl- 10 mg 40 mg 40 mg -- --glucamineNaH.sub.2 PO.sub.4.- -- -- -- 13 mg 50 mg2H.sub.2 OHydro- 1.1 mg 7.7 mg 8.4 mg -- --chloric acidSodium -- -- -- 2.8 mg 11 mghydroxidepH 9.0 3.1 8.5 8.5 7.0______________________________________ A 1000 mg quantity of Compound (I-1) was dispersed in distilled water for injection, and 3 ml of 1N-aqueous sodium hydroxide solution was added to dissolve the Compound (I-1), followed by addition of water to make up the total of 50 ml and sterile filtration by the conventional method. The resulting filtrate was filled in 1 ml portions into vials of a 12 cm.sup.3 capacity, followed by lyophilization by means of the conventional technique. The lyophilized powder as contained in vials was dissolved in in Solvent A (which was composed of 50 mg of N-methylglucamine, 0.27 ml of 1N-hydrochloric acid and 2 ml of propylene glycol being admixed with ethanol to make up the total of 4 ml), Solvent B (which was composed of 50 mg of N-methylglucamine, 0.27 ml of 1N-hydrochloric acid, 1.2 ml of polyethylene glycol 400 and 1.2 ml of ethanol being admixed with distilled water for injection to make up the total of 4 ml), Solvent C (which was composed of 50 mg of N-methylglucamine, 0.27 ml of 1N-hydrochloric acid, 1.2 ml of ethanol and 1.2 ml of propylene glycol being admixed with distilled water for injection to make up the total of 4 ml and Solvent D (which was composed of 50 mg of N-methylglucamine, 0.27 ml of 1N-hydrochloric acid and 2.5 ml of polyethylene glycol 400 bing admixed with distilled water for injection to make up the total of 4 ml), respectively, to perform inspection for their solubilities as well as to conduct investigation into appearance, clarity and contents immediately after dissolution and after storage at 25.degree. C. for 24 hours.

The results are shown in Table 4. The lyophilized powder showed excellent solubilities in all of these solvents, and were able to be dissolved quickly. In addition to this, the resulting solutions was observed to produce slight changes in appearance immediately after dissolution and after storage for 24 hours, but the changes were found to be so slight that they might in no way influence the injectable solution. The solutions were found to show no change in the clarity while being observed to decrease slightly in content of Compound (I-1).

TABLE 4______________________________________Stability of lyophilized Compound (I-1)after being dissolved in vials: SolventItem A B C D______________________________________Solubility Good Good Good GoodpH after dissolution 8.7 9.0 9.0 9.0dissolutionAfter dissolution:Appearance Colorless Colorless Colorless ColorlessClarity Clear Clear Clear ClearContent 100% 100% 100% 100%After storage at25.degree. C. for 24 hrs.:Appearance Slightly to lightly green-yellowClarity Clear Clear Clear ClearContent 97.0% 96.5% 96.7% 96.1%______________________________________

EXAMPLE 5

There were prepared 100 ml each of three kinds of aqueous solutions containing Compound(I-1), mannitol and sodium hydroxide at the individually different compositions per ml as shown in Table 5. The resulting aqueous solutions were sterile-filtered by the conventional method, and the filtrates were filled in 2 ml portions into vials of a 18 cm.sup.3 capacity, respectively, followed by lyophilization by the conventional technique to give three kinds of lyophilized vials (V1, V2 and V3) having the compositions as shown in Table 6.

Then, there were prepared 500 ml each of five kinds of aqueous solutions containing PEG-400, sodium chloride, N-methylglucamine, sodium bihydrogenphosphate, hydrochloric acid and sodium hydroxide at the individually different compositions per each 10 ml as shown in Table 7. The aqueous solutions were sterile-filtered by the conventional method, and the resulting filtrates were filled in 10 ml portions into ampoules of a 10 ml capacity, respectively. The ampoules were sealed and sterilized by high-pressure steam at 115.degree. C. for 30 minutes to give five kinds of the solutions for dissolution (S1, S2, S3, S4 and S5) having the individual formulations as shown in Table 7.

Following the combinations as described in Table 8, then, the lyophilized vials were dissolved again in the solutions for dissolution, and the resulting drug solutions were investigated for pH and state of clarity immediately after preparation and after storage at 25.degree. C. for 24 hours. As may be evident from the results shown in Table 8, the drug solutions resulting from any of the combinations were found to be stable in pH and good in clarity, whereby the lyophilized vials after being dissolved by any of the combinations exhibited good solubility.

TABLE 5______________________________________Composition of the aqueous solution to befilled into vials (in 1 ml) No.Ingredient 1 2 3______________________________________Compound (I-1) 15 mg 15 mg 15 mgMannitol 15 mg 50 mg 15 mgSodium hydroxide 2.4 mg 2.4 mg 4.8 mgDistilled water Suitable volume to make up to the total of 1 ml.______________________________________ TABLE 8______________________________________Stability after dissolution of lyophilizedvials containing Compound (I-1) StabilityCombination Immediately After storage at Solution after preparation 25.degree. C. for 24 hrs.Vial for diss'n pH Clarity pH Clarity______________________________________V1 S1 9.8 Clear 9.8 ClearV2 S1 9.9 Clear 9.8 ClearV3 S2 10.1 Clear 9.9 ClearV1 S4 9.9 Clear 10.0 ClearV2 S4 10.2 Clear 10.0 ClearV3 S5 10.0 Clear 9.9 Clear______________________________________

EXAMPLE 6

There were prepared 100 ml each of three kinds of aqueous solutions containing Compound (I-1), mannitol, N-methylglucamine and sodium hydroxide at individually different compositions per ml as shown in Table 9. The aqueous solutions were sterile-filtered in a conventional manner, and the filtrate were filled in 2 ml portions into vials of 18 cm.sup.3 capacity, respectively, followed by lyophilization in a conventional manner to give three kinds of lyophilized vials (No. V4, V5 and V6) having the compositions as shown in Table 10.

Subsequently, there were prepared 500 ml each of three kinds of aqueous solutions containing PEG-400 and sodium hydroxide at individually different compositions per each 10 ml as shown in Table 11. The aqueous solution were sterile-filtered in a conventional manner, and the resulting filtrate were filled in 10 ml portions into ampoules, respectively. The ampoules were sealed and sterilized with high-pressure steam at 115.degree. C. for 30 minutes to give three kinds of solutions for dissolution ((No. S6, S7 and S8) as shown in Table 11.

Then, following the combinations as shown in Table 12, the contents of the lyophilized vials were dissolved again in the solutions for dissolution, and the resulting drug solutions were investigated for pH and clarity immediately after preparation and after storage at 25.degree. C. for 24 hours.

As evident from the results shown in Table 12, the drug solutions obtained from any of the combinations were found to be stable in pH and good in clarity. In addition, the contents of the lyophilized vials exhibited good solubility to any one of the combination.

TABLE 9______________________________________Compositions of the aqueous solution to befilled into vials (in 1 ml) No.Ingredient 1 2 3______________________________________Compound (I-1) 15 ml 15 mg 15 mgMannitol 30 mg 30 mg 30 mgN-methylglucamine 10 mg 5 mg 2.5 mgSodium hydroxide 2.4 mg 2.4 mg 2.4 mgDistilled water making 1 ml making 1 ml making 1 mlfor injection in total in total in total______________________________________ TABLE 10______________________________________Compositions of lyophilized ampoules (in one vial) No.Ingredient V4 V5 V6______________________________________Compound (I-1) 30 mg 30 mg 30 mgMannitol 60 mg 60 mg 60 mgN-methylglucamine 20mg 10 mg 5 mgSodium hydroxide 4.8 mg 4.8 mg 4.8 mg______________________________________ TABLE 11______________________________________Compositions of solutions for dissolution (in 10 ml) No.Ingredient S6 S7 S8______________________________________PEG-400 3000 mg 3000 mg 3000 mgNaH.sub.2 PO.sub.4.2H.sub.2 O 7.8 mg 6.2 mg 5.5 mgSodium hydroxide proper proper proper amount amount amountpH 6.7 6.7 6.7______________________________________ TABLE 12______________________________________Stability of Compound (I-1) containedin lyophilized vials after dissolution StabilityCombination Immediately After 24 hours Solution for after dissolution at 25.degree. C.Vial dissolution pH Clarity pH Clarity______________________________________V4 S6 10.4 Clear 10.4 ClearV5 S7 10.4 Clear 10.3 ClearV6 S8 10.3 Clear 10.2 Clear______________________________________

Claims

1. An injectable solution made by the process comprising the steps of:

(a) freeze drying an aqueous solution having a pH not less than 11 and comprising a compound represented by the formula: ##STR4## wherein R.sup.1 represents hydrogen, methoxy or trifluoromethyl group, R.sup.2 and R.sup.3, being the same or different from each other, represent hydrogen or methyl group, and R.sup.4 represents a fluorinated C.sub.2 to C.sub.5 lower alkyl group, and N-methylglucamine; and

(b) mixing the freeze-dried material with polyethylene glycol 400 and an acidic substance in water to obtain and injectable solution having a pH of 7 to 11.

2. An injectable solution according to claim 1, of pH 7 to 11 which comprises a solution wherein a freeze-dried material of an alkaline aqueous solution containing N-methylglucamine and a compound represented by formula; ##STR5## wherein R.sup.1 represents hydrogen, methoxy or trifluoromethyl group, R.sup.2 and R.sup.3, being the same as or different from each other, represent hydrogen or methyl group; and R.sup.4 represents a fluorinated C.sub.2 to C.sub.5 lower alkyl group, said alkaline aqueous solution being not less than pH 11, has been dissolved with a mixed solution of (a) an acidic substance and (b) polyethylene glycol 400.

3. An injectable solution according to claim 1, wherein said freeze-dried material is a freeze-dried material of said alkaline aqueous solution containing a saccharide besides said compound.

4. An injectable solution according to claim 1, wherein said saccharide is mannitol.

5. An injectable solution according to claim 1, wherein said acidic substance is hydrochloric acid or sodium dihydrogenphosphate.

6. An injectable solution according to claim 1, wherein said mixed solution additionally contains sodium chloride.

7. An injectable solution according to claim 1, wherein said mixed solution contains N-methylglucamine and sodium chloride.

8. An injectable solution according to claim 1, wherein said acidic substance is hydrochloric acid or sodium dihydrogenphosphate.

9. An injectable solution made by the process comprising the steps of:

(a) freeze drying an aqueous solution having a pH not less than 11 and comprising a compound represented by the formula: ##STR6## wherein R.sup.1 represents hydrogen, methoxy or trifluoromethyl group, R.sup.2 and R.sup.3, being the same or different from each other, represent hydrogen or methyl group, and R.sup.4 represents a fluorinated C.sub.2 to C.sub.5 lower alkyl group; and

(b) mixing the freeze-dried material with polyethylene glycol 400, an acidic substance and N-methylglucamine in water to obtain an injectable solution having a pH of 7 to 11.

10. An injectable solution according to claim 9, of pH 7 to 11 which comprises a solution wherein a freeze-dried material of an alkaline aqueous solution containing N-methylglucamine and a compound represented by formula; ##STR7## wherein R.sup.1 represents hydrogen, methoxy or trifluoromethyl group, R.sup.2 and R.sup.3, being the same as or different from each other, represent hydrogen or methyl group; and R.sup.4 represents a fluorinated C.sub.2 to C.sub.5 lower alkyl group, said alkaline aqueous solution being not less than pH 11, has been dissolved with a mixed solution of (a) an acidic substance and (b) polyethylene glycol 400.

11. An injectable solution according to claim 9, wherein said freeze-dried material is a freeze-dried material of said alkaline aqueous solution containing a saccharide besides said compound.

12. An injectable solution according to claim 9, wherein said saccharide is mannitol.

13. An injectable solution according to claim 9, wherein said acidic substance is hydrochloric acid or sodium dihydrogenphosphate.

14. An injectable solution according to claim 9, wherein said mixed solution additionally contains sodium chloride.

15. An injectable solution according to claim 9, wherein said mixed solution contains N-methylglucamine and sodium chloride.

16. An injectable solution according to claim 9, wherein said acidic substance is hydrochloric acid or sodium dihydrogenphosphate.