Australia – A new study published in the British Journal of Psychiatry says more than one in five patients with treatment-resistant depression saw severe depression symptoms disappear after receiving ketamine injections in a clinical trial, while one third reported their symptoms improved by at least 50 per cent. Lead author Colleen Loo said in a news release: “We found that in this trial, ketamine was clearly better than the placebo – with 20 per cent reporting they no longer had clinical depression compared with only two per cent in the placebo group. This is a huge and very obvious difference and brings definitive evidence to the field which only had past smaller trials that compared ketamine with placebo.”