Reserpine lowers blood pressure by decreasing the levels of certain chemicals in your blood. This allows your blood vessels (veins and arteries) to relax (widen) and your heart to beat more slowly and easily. Reserpine is used to treat hypertension (high blood pressure). Reserpine is also sometimes used to treat psychotic states such as schizophrenia. Reserpine may also be used for purposes other than those listed in this medication guide.