Zolpidem has little effect of the muscle relaxant or anti-seizure but more of the sedative effect. Thus, it is a sedative-hypnotic (non-benzodiazepine ) used to treat insomnia. The tartrate salt of zolpidem is a white to off-white crystalline powder; slightly soluble in water, sparingly soluble in alcohol, propylene glycol, practically insoluble in methylene chloride.