http://www.sciencemag.org/news/2018...ight-depression-muzzling-bursting-brain-cells https://m.medicalxpress.com/news/2018-02-ketamine-brain-area-depression-quickly.html
This is the abstract of the article in Nature. I have paragraphed it for easier reading. https://www.nature.com/articles/nature25509
Problem with many street drugs is you don't know what you're taking or, in the case of white powders, what it's been cut with. Unless you got it direct from the vet, how would you know?