Dipsogen

A dipsogen is an agent that causes thirst. (From Greek: "δίψα" "(dipsa)", "thirst" and the suffix "-gen", "to create".)
Physiology.
Angiotensin II is thought to be a powerful dipsogen, and is one of the products of the renin–angiotensin pathway, a biological homeostatic mechanism for the regulation of electrolytes and water.