Quinaldine sulfate is a highly soluble light yellow powder that has a wider margin of safety than tricaine. It is not metabolized
by fish and is excreted unchanged (Harms and Bakal 1994). Unlike its cousin Quinaldine, which is a slightly water-soluble, oily liquid, the salt Quinaldine sulfate has no odor. Both are irritating to mucous membranes. Like tricaine, Quinaldine depresses sensory centers of the central nervous system. Because it is lipid soluble, Quinaldine accumulates preferentially in the brain (Summerfelt and Smith 1990). Quinaldine and stock solutions of Quinaldine sulfate must be stored in tightly sealed containers that protect them from light.