Per my drug book for medic school dextrose is classified as a carbohydrate and sodium is an electrolyte.Sodium bicarbonate; Sodium chloride or something else? Electrolyte would be my classification if sodium is the active agent in question. I consider dextrose kind of in a class of its own. You could call it a carbohydrate if you really wanted to classify it for some reason.
Because dextrose is absorbed and metabolized into the cells rapidly, leaving only free water. While something like D50 may be initially hyperosmolar (and causing resultant tissues destruction if it gets out of the vascular system) the time that dextrose molecules are in the vascular system is not long enough to cause a fluid shift outward. Meaning you're left with only the sterile water it was dissolved in, which is pretty much the definition of hypotonic. This is one of the reasons you won't see D5 on TBI patients unless it's absolutely essential.Why do you think hypOtonic?