Treatment using dantrolene

Abstract

Provided are low-volume, safe for injection formulations of dantrolene yielding significant advantages over the currently approved and marketed dantrolene for malignant hyperthermia (MH) threatening anesthetic crisis. Once dantrolene can be made immediately available to patients triggered of MH, the anesthesiologist will be able to focus exclusively on the management of the patient's physiologic status in this complex and evolving crisis, not on the laborious and time consuming reconstitution process of the rescue agent. The low volume, safe for injection formulations of dantrolene have significant advantages over currently used approaches to the prevention and treatment of pumphead, and other neurological, cognitive and motor dysfunction incident to iatrogenically or trauma induced situations of altered blood flow, including those incurred during surgical procedures involving CPB or related procedures, as well as those incurred during non-normothermic episodes caused iatrogenically or by disease.

What is claimed is: 
     
         1 . A method of treating a human at risk of developing heat stroke, comprising intravenously administering to said human a formulation comprising:
 a salt of dantrolene;   a polyvinylpyrrolidone; and   water;   wherein the formulation includes up to 500 mg of dantrolene in a volume of less than or equal to about 150 mL   wherein the concentration of dantrolene is 30-80 mg/mL;   wherein the formulation is in the form of a stable colloidal suspension,   wherein the particles of the colloidal suspension are less than about 2 microns in average diameter; and   wherein the amount of dantrolene administered to said human is from 0.1 to 10 mg/kg.   
     
     
         2 . The method of  claim 1 , wherein the amount of dantrolene administered to the patient is from 0.5 to 4 mg/kg. 
     
     
         3 . The method of  claim 1 , wherein the amount of dantrolene administered to the patient is 2.5 mg/kg. 
     
     
         4 . The method of  claim 1 , wherein the salt of dantrolene is a sodium, potassium, ammonium, calcium, or magnesium salt. 
     
     
         5 . The method of  claim 4 , wherein the salt of dantrolene is a sodium salt. 
     
     
         6 . The method of  claim 1 , wherein the volume is less than or equal to about 100 mL. 
     
     
         7 . The method of  claim 1 , wherein the volume is less than or equal to about 30 mL. 
     
     
         8 . The method of  claim 1 , wherein the volume is less than or equal to about 5 mL. 
     
     
         9 . The method of  claim 1 , wherein the particles are less than 0.8 microns in average diameter. 
     
     
         10 . The method of  claim 1 , wherein the particles are less than 0.45 microns in average diameter. 
     
     
         11 . The method of  claim 1 , wherein said formulation further comprises lactose, trehalose, sorbitol, sucrose, dextrose, or mannitol. 
     
     
         12 . The method of  claim 1 , wherein the method prevents the human from developing heat stroke.