CN114767626A - Famotidine injection and preparation method thereof - Google Patents

Famotidine injection and preparation method thereof Download PDF

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CN114767626A
CN114767626A CN202210342858.0A CN202210342858A CN114767626A CN 114767626 A CN114767626 A CN 114767626A CN 202210342858 A CN202210342858 A CN 202210342858A CN 114767626 A CN114767626 A CN 114767626A
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famotidine
injection
chlorogenic acid
water
quaternary ammonium
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曹琦
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Tianjin Jinyao Group Hubei Tianyao Pharmaceutical Co ltd
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Tianjin Jinyao Group Hubei Tianyao Pharmaceutical Co ltd
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00Medicinal preparations containing organic active ingredients
    • A61K31/33Heterocyclic compounds
    • A61K31/395Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/425Thiazoles
    • A61K31/4261,3-Thiazoles
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/08Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
    • A61K47/10Alcohols; Phenols; Salts thereof, e.g. glycerol; Polyethylene glycols [PEG]; Poloxamers; PEG/POE alkyl ethers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/06Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
    • A61K47/08Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen, e.g. ethers, acetals, ketones, quinones, aldehydes, peroxides
    • A61K47/14Esters of carboxylic acids, e.g. fatty acid monoglycerides, medium-chain triglycerides, parabens or PEG fatty acid esters
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K47/00Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/30Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
    • A61K47/36Polysaccharides; Derivatives thereof, e.g. gums, starch, alginate, dextrin, hyaluronic acid, chitosan, inulin, agar or pectin
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K9/00Medicinal preparations characterised by special physical form
    • A61K9/0012Galenical forms characterised by the site of application
    • A61K9/0019Injectable compositions; Intramuscular, intravenous, arterial, subcutaneous administration; Compositions to be administered through the skin in an invasive manner
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
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    • A61K9/08Solutions
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/04Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61PSPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P7/00Drugs for disorders of the blood or the extracellular fluid
    • A61P7/04Antihaemorrhagics; Procoagulants; Haemostatic agents; Antifibrinolytic agents

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Abstract

The invention discloses a famotidine injection and a preparation method thereof. The famotidine injection comprises the following components: famotidine, chlorogenic acid, propylene glycol, chitosan quaternary ammonium salt and water for injection. The chlorogenic acid can greatly increase the solubility of famotidine in water, and the molecular structure of the chlorogenic acid contains a large amount of phenolic hydroxyl groups and has strong oxidation resistance, so that the famotidine injection is stable and is not degraded into other impurity substances; when sodium hydroxide or potassium hydroxide is added into the famotidine injection to adjust the pH value of the solution, as the molecular structure of chlorogenic acid contains carboxyl, the chlorogenic acid and the sodium hydroxide or the potassium hydroxide form a salt, the chlorogenic acid and the chlorogenic acid salt form a buffer system, the pH value of the solution can be kept stable for a long time, and the famotidine in the injection can be kept stable; the chitosan quaternary ammonium salt can adsorb phosphate radical and carboxylate radical on pyrogen molecules, and further remove pyrogen in famotidine injection.

Description

Famotidine injection and preparation method thereof
Technical Field
The invention belongs to the technical field of biological medicines, and particularly relates to famotidine injection and a preparation method thereof.
Background
Famotidine (Famotidine), the third generation histamine H2 receptor antagonist of the family of peridothiazoles, was first discovered and synthesized in the 70's of the 20 th century by the central institute of pharmaceutical corporation, japan. The medicine has high affinity to H2 receptor, can reduce the stimulation of gastric acid to gastric mucosa, promote ulcer healing, increase blood flow of gastric mucosa to enhance defense factor, and has good therapeutic effect on peptic ulcer. Clinically, famotidine is mainly used for treating diseases such as upper gastrointestinal hemorrhage caused by peptic ulcer and gastric and duodenal chyle hemorrhage caused by tumor, esophagus or gastric fundus varicosis. Famotidine, chemically known as 3- [ [ [2- [ (diaminomethylene) -4-thiazolyl ] methyl ] thio ] -N-sulfamoylpropionamidine, is a white or off-white crystalline powder; slightly bitter in taste; the color becomes dark when meeting light; slightly soluble in methanol, very slightly soluble in acetone, hardly soluble in water or chloroform, and easily soluble in glacial acetic acid; the melting point is 160-165 ℃, and the materials are decomposed simultaneously during melting.
Because famotidine has poor solubility, the famotidine has extremely poor stability after being dissolved in water and is not dissolved in cold water, and the famotidine is dissolved by an acid solution which is used for assisting in dissolving, but the famotidine has poor stability in an acid environment and is more stable in a neutral solution. At present, common famotidine dosage forms are tablets, capsules, injections and the like. Chinese patent document CN 113143859A discloses a famotidine injection and a preparation method thereof, wherein the famotidine injection consists of famotidine, ethanol, glycerol, acid and mannitol, and the scheme adopts a compound system formed by ethanol-glycerol-acid to synergically and obviously increase the solubility, the tolerance to pH and the stability of the famotidine, so that the safety of the preparation is improved; chinese patent document CN 112006999A discloses a preparation method of famotidine preparation for injection, which greatly reduces the content of relevant substances of the prepared preparation and keeps the water content stable in the storage period by controlling the temperature of the prepared liquid at 20-30 ℃ and controlling the drying weight loss of a rubber plug to be below 0.15 percent, accelerates the dissolution speed of main medicine and obviously shortens the liquid preparation time by controlling the sequence of adding auxiliary materials, and all standards of the preparation accord with the regulations.
The prepared famotidine injection also has the problems of poor solubility, low stability, high impurity content and the like, and in view of the above, a famotidine injection is needed to be provided to solve the technical problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a famotidine injection and a preparation method thereof. Solves the problems of poor solubility, low stability, high impurity content and the like of the existing famotidine injection.
The invention aims to provide a famotidine injection.
A famotidine injection comprises the following components: famotidine, chlorogenic acid, propylene glycol, chitosan quaternary ammonium salt and water for injection.
Further, by mass percentage, the amount of famotidine is 1-1.5%, the amount of chlorogenic acid is 1-3%, the amount of propylene glycol is 5-8%, the amount of chitosan quaternary ammonium salt is 0.05-1%, and the balance is water for injection.
Further, the pH value of the famotidine injection is 5.2-6.0, and the pH value can be adjusted by adding sodium hydroxide or potassium hydroxide.
Furthermore, the pH value of the famotidine injection is 5.5-5.8.
The invention also aims to provide a preparation method of the famotidine injection.
The preparation method of the famotidine injection comprises the following steps:
s1, taking injection water with the amount of 80-90% of the prescription amount, heating and preserving heat;
s2, adding chlorogenic acid in a prescription amount into the water for injection in the step S1, fully stirring to dissolve the chlorogenic acid, adding famotidine in the prescription amount, and continuing stirring to fully dissolve the famotidine to obtain a first mixed solution;
s3, cooling the first mixed solution obtained in the step S2, then respectively adding the formula amount of propylene glycol, the formula amount of chitosan quaternary ammonium salt and the balance of water for injection, stirring uniformly, and adjusting the pH value of the solution to obtain a second mixed solution;
s4, filtering the second mixed solution obtained in the step S3 by a filter membrane, and then sterilizing to obtain the famotidine injection.
Further, in step S1, the heating temperature is 70-80 ℃.
Further, in step S3, the temperature of the temperature decrease is 30 ℃ or lower.
Further, in step S4, the filter size is 0.22 μm.
Further, in step S4, the sterilization parameters are as follows: sterilizing for 15-30 min at the temperature of 100-115 ℃.
Compared with the prior art, the invention has the following advantages:
the famotidine injection comprises the following components: famotidine, chlorogenic acid, propylene glycol, chitosan quaternary ammonium salt and water for injection. The chlorogenic acid is a depside acid formed by caffeic acid and quinic acid, the molecular structure of the chlorogenic acid has three partial structures of carboxyl, unsaturated double bond and polyphenol, the aqueous solution of the chlorogenic acid is acidic, the solubility of famotidine in water can be greatly increased, and the molecular structure of the chlorogenic acid contains a large amount of phenolic hydroxyl groups and has strong oxidation resistance, so that famotidine injection can be kept stable and is not degraded into other impurity substances; when sodium hydroxide or potassium hydroxide is added into the famotidine injection to adjust the pH value of the solution, as the molecular structure of chlorogenic acid contains carboxyl, the chlorogenic acid and the sodium hydroxide or the potassium hydroxide form a salt, the chlorogenic acid and the chlorogenic acid salt form a buffer system, the stability of the pH value of the solution can be kept for a long time, and the famotidine in the injection is kept stable; meanwhile, chlorogenic acid is also an antibacterial agent, and can obviously prolong the storage time of the famotidine injection; the propylene glycol is used as a dispersing agent, so that the famotidine injection is uniformly dispersed; the chitosan quaternary ammonium salt is a high molecular compound, has positive charges in the molecular structure, can adsorb phosphate radicals and carboxylate radicals on pyrogen molecules, further removes the pyrogen in the famotidine injection, has antibacterial performance, and has synergistic effect with chlorogenic acid, so that the storage time of the famotidine injection is greatly prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are merely exemplary embodiments, rather than exemplary embodiments, and that all other embodiments may be devised by those skilled in the art without departing from the scope of the present invention.
The conventional reagents and equipment used in the present invention are commercially available unless otherwise specified.
Example 1
The famotidine injection comprises, by mass, 1% of famotidine, 1% of chlorogenic acid, 5% of propylene glycol, 0.05% of chitosan quaternary ammonium salt and the balance of water for injection.
The preparation method of the famotidine injection comprises the following steps:
s1, taking injection water with the amount of 80-90% of the prescription amount, heating to 70-80 ℃, and then preserving heat;
s2, adding chlorogenic acid in a prescription amount into the water for injection in the step S1, fully stirring to dissolve the chlorogenic acid, adding famotidine in the prescription amount, and continuing stirring to fully dissolve the famotidine to obtain a first mixed solution;
s3, cooling the first mixed solution obtained in the step S2 to a temperature below 30 ℃, then respectively adding the formula amount of propylene glycol, the formula amount of chitosan quaternary ammonium salt and the balance of water for injection, uniformly stirring, and adjusting the pH value of the solution to 5.8 to obtain a second mixed solution;
s4, filtering the second mixed solution obtained in the step S3 by a filter membrane with the specification of 0.22 mu m, and sterilizing for 15-30 min at the temperature of 100-115 ℃ to obtain the famotidine injection.
Example 2
The famotidine injection comprises, by mass, 1.2% of famotidine, 1.8% of chlorogenic acid, 6% of propylene glycol, 0.07% of chitosan quaternary ammonium salt and the balance of water for injection.
The preparation method of the famotidine injection comprises the following steps:
s1, taking injection water with the amount of 80-90% of the prescription amount, heating to 70-80 ℃, and then preserving heat;
s2, adding chlorogenic acid in a prescription amount into the water for injection in the step S1, fully stirring to dissolve the chlorogenic acid, adding famotidine in the prescription amount, and continuing stirring to fully dissolve the famotidine to obtain a first mixed solution;
s3, cooling the first mixed solution obtained in the step S2 to a temperature below 30 ℃, then respectively adding the propylene glycol, the chitosan quaternary ammonium salt and the rest of the water for injection according to the prescription amount, uniformly stirring, and adjusting the pH value of the solution to 5.7 to obtain a second mixed solution;
s4, filtering the second mixed solution obtained in the step S3 by a filter membrane with the specification of 0.22 μm, and sterilizing for 15-30 min at the temperature of 100-115 ℃ to obtain the famotidine injection.
Example 3
The famotidine injection comprises, by mass, 1.4% of famotidine, 2.5% of chlorogenic acid, 7% of propylene glycol, 0.09% of chitosan quaternary ammonium salt and the balance of water for injection.
The preparation method of the famotidine injection comprises the following steps:
s1, taking injection water with the amount of 80-90% of the prescription amount, heating to 70-80 ℃, and then preserving heat;
s2, adding chlorogenic acid in a prescription amount into the water for injection in the step S1, fully stirring to dissolve the chlorogenic acid, adding famotidine in the prescription amount, and continuing stirring to fully dissolve the famotidine to obtain a first mixed solution;
s3, cooling the first mixed solution obtained in the step S2 to a temperature below 30 ℃, then respectively adding the formula amount of propylene glycol, the formula amount of chitosan quaternary ammonium salt and the balance of water for injection, uniformly stirring, and adjusting the pH value of the solution to 5.6 to obtain a second mixed solution;
s4, filtering the second mixed solution obtained in the step S3 by a filter membrane with the specification of 0.22 mu m, and sterilizing for 15-30 min at the temperature of 100-115 ℃ to obtain the famotidine injection.
Example 4
The famotidine injection comprises, by mass, 1.5% of famotidine, 3% of chlorogenic acid, 8% of propylene glycol, 1% of chitosan quaternary ammonium salt and the balance of water for injection.
The preparation method of the famotidine injection comprises the following steps:
s1, taking injection water with the amount of 80-90% of the prescription amount, heating to 70-80 ℃, and then preserving heat;
s2, adding chlorogenic acid in a prescription amount into the water for injection in the step S1, fully stirring to dissolve the chlorogenic acid, adding famotidine in the prescription amount, and continuing stirring to fully dissolve the famotidine to obtain a first mixed solution;
s3, cooling the first mixed solution obtained in the step S2 to a temperature below 30 ℃, then respectively adding the propylene glycol, the chitosan quaternary ammonium salt and the rest of the water for injection according to the prescription amount, uniformly stirring, and adjusting the pH value of the solution to 5.5 to obtain a second mixed solution;
s4, filtering the second mixed solution obtained in the step S3 by a filter membrane with the specification of 0.22 μm, and sterilizing for 15-30 min at the temperature of 100-115 ℃ to obtain the famotidine injection.
Comparative example 1
The formula and preparation method of famotidine injection are basically the same as those in example 2, except that chlorogenic acid is not added into the famotidine injection, and hydrochloric acid is added during the preparation process.
Comparative example 2
The formulation and preparation method of famotidine injection are basically the same as those in example 2, except that chlorogenic acid in the famotidine injection is replaced by aspartic acid.
Comparative example 3
The formula and preparation method of famotidine injection are basically the same as those in example 2, except that chitosan quaternary ammonium salt is not added into famotidine injection.
Example 5
The famotidine injection solutions prepared in examples 1-4 and comparative examples 1-3 were tested for long-term stability, and samples were taken for 12 months under long-term conditions (25 + -2 deg.C, 60 + -10% RH), and then sampled at months 0, 6 and 12, respectively, to determine the contents, pH and related substances, and the results are shown in Table 1 below:
wherein, the content, the pH value and related substances are measured according to the regulations in famotidine injection in the second part of China pharmacopoeia 2020 edition.
TABLE 1 Long term stability test results
Figure BDA0003575528830000071
As can be seen from the results in the table, after the famotidine injection prepared in the examples 1-4 is placed for 12 months, the pH value of the solution is basically kept stable, the related substances are slightly increased, the content of famotidine is slightly reduced, the storage time of the whole injection is longer, and the solution is kept stable.
The formula and preparation method of the motidine injection in the comparative example 1 are basically the same as those in the example 2, except that chlorogenic acid is not added into the famotidine injection, and hydrochloric acid is added during the preparation process. As a result, after the prepared famotidine injection is placed for 12 months, the pH value of the solution is reduced, related substances are obviously increased, and the content of famotidine is obviously reduced. The water solution of the chlorogenic acid is acidic, so that the solubility of the famotidine in water can be greatly increased, and the molecular structure of the chlorogenic acid contains a large amount of phenolic hydroxyl groups and has strong oxidation resistance, so that the famotidine injection is stable and is not degraded into other impurity substances; when sodium hydroxide or potassium hydroxide is added into the famotidine injection to adjust the pH value of the solution, as the molecular structure of chlorogenic acid contains carboxyl, the chlorogenic acid and the sodium hydroxide or the potassium hydroxide form a salt, the chlorogenic acid and the chlorogenic acid salt form a buffer system, the pH value of the solution can be kept stable for a long time, and the famotidine in the injection can be kept stable.
The formulation and preparation method of famotidine injection in comparative example 2 are substantially the same as those in example 2, except that chlorogenic acid in the famotidine injection is replaced by aspartic acid. As a result, after the prepared famotidine injection is placed for 12 months, the pH value of the solution is reduced to a certain extent, related substances are increased, and the content of famotidine is reduced. Although the aqueous solution of the aspartic acid is acidic, the solubility of the famotidine in water can be greatly increased, but the aspartic acid lacks the anti-oxidation performance, so that the stability of the prepared famotidine injection is reduced.
The formulation and preparation method of famotidine injection in comparative example 3 are substantially the same as those in example 2, except that chitosan quaternary ammonium salt is not added to the famotidine injection. As a result, after the prepared famotidine injection is placed for 12 months, the pH value of the solution is reduced to a certain extent, related substances are increased, and the content of famotidine is reduced. This is because the pyrogen in the prepared famotidine injection cannot be removed without adding chitosan quaternary ammonium salt, which results in the increase of the content of other substances.
Example 6
10 patients with peptic ulcer and hemorrhagic symptoms were selected and treated with intravenous infusion using famotidine injection (2 mL: 24mg) prepared in example 2, and first, famotidine injection was diluted with 5% dextrose saline so that the concentration of the dilution was 0.08mg/mL, and then intravenous infusion was performed on each of the above 10 patients, and the presence or absence of side effects during the infusion was observed.
No side effect occurs in 10 cases of patients who are transfused during the transfusion process, and the result shows that the famotidine injection prepared by the invention is safe and has no obvious side effect.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.

Claims (9)

1. The famotidine injection is characterized by comprising the following components: famotidine, chlorogenic acid, propylene glycol, chitosan quaternary ammonium salt and water for injection.
2. The famotidine injection according to claim 1, wherein the famotidine is 1-1.5% by mass, the chlorogenic acid is 1-3% by mass, the propylene glycol is 5-8% by mass, the chitosan quaternary ammonium salt is 0.05-1% by mass, and the balance is water for injection.
3. The famotidine injection according to claim 1, wherein the famotidine injection has a pH value of 5.2-6.0, and the pH value can be adjusted by adding sodium hydroxide or potassium hydroxide.
4. The famotidine injection according to claim 3, wherein the famotidine injection has a pH of 5.5-5.8.
5. The method for preparing famotidine injection according to any one of claims 1 to 4, which comprises the following steps:
s1, taking 80-90% of injection water according to the prescription amount, heating and then preserving heat;
s2, adding chlorogenic acid with the prescription amount into the water for injection in the step S1, fully stirring to dissolve the chlorogenic acid, then adding famotidine with the prescription amount, and continuing stirring to fully dissolve the famotidine to obtain a first mixed solution;
s3, cooling the first mixed solution obtained in the step S2, then respectively adding the formula amount of propylene glycol, the formula amount of chitosan quaternary ammonium salt and the balance of water for injection, stirring uniformly, and adjusting the pH value of the solution to obtain a second mixed solution;
s4, filtering the second mixed solution obtained in the step S3 by a filter membrane, and then sterilizing to obtain the famotidine injection.
6. The method for preparing famotidine injection according to claim 5, wherein the heating temperature in step S1 is 70-80 ℃.
7. The method of claim 5, wherein the temperature of the solution is reduced to 30 ℃ or lower in step S3.
8. The method of claim 5, wherein the size of the filter membrane is 0.22 μm in step S4.
9. The method of claim 5, wherein the sterilization parameters in step S4 are as follows: sterilizing for 15-30 min at the temperature of 100-115 ℃.
CN202210342858.0A 2022-03-31 2022-03-31 Famotidine injection and preparation method thereof Pending CN114767626A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11193233A (en) * 1997-10-16 1999-07-21 Yamanouchi Pharmaceut Co Ltd Injection agent
CN1421204A (en) * 2002-12-04 2003-06-04 黄振华 Lafutidine injecta and its prepn
CN101716136A (en) * 2009-11-27 2010-06-02 河南辅仁怀庆堂制药有限公司 Famotidine injection and preparation method thereof
CN102225050A (en) * 2011-06-28 2011-10-26 回音必集团(江西)东亚制药有限公司 Method for preparing famotidine sodium chloride injection by inclusion method and product prepared by using the same
CN103550170A (en) * 2013-10-15 2014-02-05 海南卫康制药(潜山)有限公司 Lafutidine composition freeze-dried powder injection for injection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11193233A (en) * 1997-10-16 1999-07-21 Yamanouchi Pharmaceut Co Ltd Injection agent
CN1421204A (en) * 2002-12-04 2003-06-04 黄振华 Lafutidine injecta and its prepn
CN101716136A (en) * 2009-11-27 2010-06-02 河南辅仁怀庆堂制药有限公司 Famotidine injection and preparation method thereof
CN102225050A (en) * 2011-06-28 2011-10-26 回音必集团(江西)东亚制药有限公司 Method for preparing famotidine sodium chloride injection by inclusion method and product prepared by using the same
CN103550170A (en) * 2013-10-15 2014-02-05 海南卫康制药(潜山)有限公司 Lafutidine composition freeze-dried powder injection for injection

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