Leakage inhibiting agent for local injection preparation, local injection preparation including the same, and method for producing local injection preparation
A leakage inhibiting agent includes a gelatin hydrolysate having a weight average molecular weight of 5000 or lees, wherein a degree of viscosity at 25° C. of a first solution obtained by dissolving the gelatin hydrolysate in phosphate buffered saline and adjusting the concentration of the gelatin hydrolysate to 40% by mans is 20 mPa·s or less.
1 . A leakage inhibiting agent for a local injection preparation, comprising a gelatin hydrolysate having a weight average molecular weight of 5000 or less, wherein
a degree of viscosity at 25° C. of a first solution obtained by dissolving the gelatin hydrolysate in phosphate buffered saline and adjusting a concentration of the gelatin hydrolysate to 40% by mass is 20 mPa·s or less.
2 . The leakage inhibiting agent according to claim 1 , wherein the leakage inhibiting agent consists of the gelatin hydrolysate.
3 . The leakage inhibiting agent according to claim 1 , wherein the leakage inhibiting agent is for a local injection preparation with which a syringe including an injection needle having an outer diameter of 23 G or more and 37 G or less is filled.
4 . The leakage inhibiting agent according to claim 1 , wherein the leakage inhibiting agent is for a local injection preparation with which a syringe including an injection needle having an outer diameter of 23 G or more and 27 G or less is filled.
5 . A local injection preparation comprising the leakage inhibiting agent according to claim 1 .
6 . The local injection preparation according to claim 5 , wherein
the local injection preparation comprises 5% by mass or more and 40% by mass or less of the leakage inhibiting agent, and
a degree of viscosity at 25° C. of the local injection preparation is 2 mPa·s or more and 20 mPa·s or less.
7 . The local injection preparation according to claim 5 , wherein
the local injection preparation comprises 5% by mass or more and 40% by mass or less of the leakage inhibiting agent, and
a degree of viscosity at 25° C. of the local injection preparation is 2 mPa·s or more and 10 mPa·s or less.
8 . The local injection preparation according to claim 5 , wherein
the local injection preparation comprises 5% by mass or more and 40% by mass or less of the leakage inhibiting agent, and
a degree of viscosity at 25° C. of the local injection preparation is 8 mPa·s or more and 20 mPa·s or less.
9 . A method for producing the local injection preparation according to claim 5 , the method comprising:
preparing the leakage inhibiting agent, a water-based solvent, and an active ingredient; and
obtaining the local injection preparation by mixing the leakage inhibiting agent and the active ingredient into the water-based solvent at 1° C. or more and 30° C. or less.
10 . The method for producing the local injection preparation according to claim 9 , wherein
the obtaining the local injection preparation is any of
obtaining the local injection preparation by mixing the leakage inhibiting agent into the water-based solvent to obtain a first injection precursor and then mixing the active ingredient into the first injection precursor, or
obtaining the local injection preparation by mixing the active ingredient into the water-based solvent to obtain a second injection precursor and then mixing the leakage inhibiting agent into the second injection precursor, or
obtaining the local injection preparation by simultaneously mixing the leakage inhibiting agent and the active ingredient into the water-based solvent.