al or parenteral use, is poorly soluble or insoluble in the organic solvent, and will preferably form an isotonic solution in water in a concentration range of from about 1 to about 10% w/v, and preferably from about 3 to about 7% w/v; examples of such additional carrier materials include sorbitol, mannitol, xylitol, or naturally occurring amino acids such as arginine or glycine, with sorbitol bei