Formulation of Resiniferatoxin
Disclosed herein are safer formulations of resiniferatoxin (RTX) for intrathecal, intraganglionic intraarticular and pericardial administration. More specifically, there is disclosed alcohol-free formulations of RTX comprising a solubilizing component, a monosaccharide or sugar alcohol, a saline buffer, and RTX, and having narrow ranges for pH range and specific gravity.
1 . A non-alcoholic formulation of RTX comprising from about 10 μg/mL to about 200 μg/mL RTX solubilized in a solubilizing agent, a monosaccharide or sugar alcohol, and a buffer solution, wherein the formulation has a pH from about 6.5 to about 7.5.
2 . The non-alcoholic formulation of RTX of claim 1 , wherein the solubilizing agent is selected from the group consisting of PEG, polysorbate and cyclodextrin, or combinations thereof.
3 . The non-alcoholic formulation of RTX of claim 1 , wherein the formulation comprises from about 25-50 μg/mL RTX.
4 . The non-alcoholic formulation of RTX of claim 1 , wherein the monosaccharide or sugar alcohol is selected from the group consisting of dextrose and mannitol, or combinations thereof.
5 . The non-alcoholic formulation of RTX of claim 1 , wherein the saline buffer is selected from the group consisting of a phosphate buffer, an acetate buffer, and a citrate buffer, or combinations thereof.
6 . The non-alcoholic formulation of RTX of claim 1 , further comprising an antioxidant.
7 . The non-alcoholic formulation of RTX of claim 6 , wherein the antioxidant is selected from the group consisting of ascorbic acid, citric acid, potassium bisulfate, sodium bisulfate acetone sodium bisulfate, monothioglycerol, potassium metabisulfite, and sodium metabisulfite, or combinations thereof.
8 . The non-alcoholic formulation of RTX of claim 2 , wherein the solubilizing agent is selected from the group consisting of PEG (0-40%), polysorbate (0-5%) and cyclodextrin (0-5%), or combinations thereof.
9 . The non-alcoholic formulation of RTX of claim 1 , comprising from about 10 μg/mL to about 200 μg/mL RTX solubilized in polysorbate 80, dextrose, and a phosphate buffer solution, wherein the formulation has a pH from about 6.5 to about 7.5.
10 . The non-alcoholic formulation of RTX of claim 9 , comprising 200 μg/mL RTX solubilized in 0.03% v/v polysorbate 80, 0.05% w/v dextrose, and 30 mM phosphate buffer solution, wherein the formulation has a pH of about 7.2.