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The head of a man and a woman are shown side by side in a research study focused on ketamine and depression.

Ketamine’s remarkable effect bolsters a new theory of mental illness.

Vets say marijuana treats PTSD, but their doctors can’t prescribe it

PTSD develops after a person experiences, or is a witness to, a life-threatening or traumatic event — a natural disaster, for example — or is exposed to combat, or sexual […]