Famotidine injections
The present invention exhibits a remarkable effect of making it possible to provide a famotidine injection solution containing famotidine at a high concentration, being stable for a long period of time at room temperature, and having a low viscosity without impairing the absorption of famotidine, which can be hardly provided so far.
1. A famotidine injection solution containing famotidine or its salt in an amount of about 1 mg/ml to about 40 mg/ml in terms of the base, further containing one or two or more water-soluble acid amides selected from the group consisting of nicotinic acid amide, isonicotinic acid amide, gentisic acid ethanolamide, urea and N,N-dimethylacetamide in an amount of about 1 mg to about 30 mg per 1 mg of famotidine, and an acidic substance, and having a pH of about 5.5 to about 7.5 and a kinematic viscosity at room temperature of about 0.9 centistokes or more to about 3 centistokes or less.
2. The famotidine injection solution according to claim 1 , which further contains a sugar alcohol and/or sugar.
3. The famotidine injection solution according to claim 2 , wherein a mixing amount of the sugar alcohol and/or sugar is from about 0.2 to about 16% by weight.
4. The famotidine injection solution according to claim 2 , wherein the sugar alcohol and/or sugar is one or two or more compounds selected from the group consisting of mannitol, sorbitol, glucose, and mannose.
5. The famotidine injection solution according to claim 2 , wherein the sugar alcohol and/or sugar is mannitol.
6. The famotidine injection solution according to claim 1 , which further contains ascorbic acid and/or erythorbic acid.
7. The famotidine injection solution according to claim 1 , wherein the concentration of famotidine or its salt is from about 5 mg/ml to about 20 mg/ml in terms of the base.
8. The famotidine injection solution according to claim 1 , wherein the amount of the acidic substance to be added is from 0.2 to 20 mols relative to 1 mol of famotidine or its salt.
9. The famotidine injection solution according to claim 1 , wherein the acidic substance is one or two or more compounds selected from the group consisting of hydrochloric acid, lactic acid, L-aspartic acid, L-glutamic acid, benzoic acid, citric acid, malic acid, ascorbic acid, erythorbic acid, gluconic acid, acetic acid, and nicotinic acid.
10. The famotidine injection solution according to claim 1 , wherein the water-soluble acid amide is one or two or more compounds selected from the group consisting of nicotinic acid amide, isonicotinic acid amide, and N,N-dimethylacetamide.
11. The famotidine injection solution according to claim 1 , wherein the acidic substance is lactic acid, L-aspartic acid, or L-glutamic acid.