Some Connecticut hospitals and doctors and a clinic are starting to treat severely depressed patients with a new nasal spray called Spravato, touted as the most significant federally approved depression medication since Prozac was approved in 1987. Spravato, which received Food and Drug Administration (FDA) approval in March, has raised hopes for preventing suicides and relieving depression after other treatments have failed. But there are concerns about possible side effects, including drug abuse, elevated blood pressure and heart rate, sedation, and hypersensitivity to surroundings. The nasal spray is prescribed for treatment-resistant depression after at least two other antidepressants haven’t worked and is given with an oral antidepressant. It is only administered in restrictive clinical settings to reduce potential for abuse and side effects.