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The use of ketamine has boomed acrdoss the country, something medical experts have said is being driven by clinics and online services offering intravenous treatments and prescriptions for in-home use — such as lozenges and nasal sprays — for ailments including depression, post-traumatic stress and substance use disorder.

The 53-year-old is a former infantryman with King's Own Scottish Borderers who is blind in one eye and suffers from post-traumatic stress disorder.

"The kind of growth that people ultimately find can be beneficial ... It is very much akin to a kind of post-traumatic growth."

In the qualitative study, more than half of the 26 participants either explicitly reported their experience as traumatic or described experiencing symptoms of post-traumatic stress disorder.

“It is very much akin to a kind of post-traumatic growth.”