As thousands of Ukrainian soldiers struggle with debilitating PTSD since the Russian invasion, one unconventional therapy has proved surprisingly effective: ketamine. How did this become a treatment for mental illness? And does it really work? 

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Guest: Catherine Philp, World Affairs Editor, The Times.

Host: Luke Jones.

Producer: Taryn Siegel.

Clips: Netflix/How to change your mind.

Photo: Getty Images.

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