Rubidium chloride (RbCl) is an inorganic salt that is proposed to have stimulant, antidepressive and nootropic effects. It sold in some parts of Europe under the name "Rubinorm." The substance's mechanism of action is unknown; however, it is possibly similar to lithium's, as rubidium is in the same element group of the periodic table.
First trials of the salt as psychiatric treatment began in the 20th century. In one particular experiment, a group of patients with depressive and bipolar disorders were given RbCl. As a result, patients with bipolar disorder have had their mania phases prolonged, and their depressive symptoms decreased; depressive patients have also had their symptoms decreased. It was concluded that rubidium chloride exhibits antidepressive properties.