Everyone’s depression is different, but Ted, a 40-year-old resident of Portland, Oregon, describes his as a “continuous dark veil — a foul, dark, awful perspective that informs every moment of your whole life.” He’d tried to treat it with antidepressants, therapy, visits to psychiatrists, “the whole nine,” but although the antidepressants kept him functional, they by no means offered relief. He was getting desperate, so when his sister — an obstetrician who works in New York — mentioned the National Institute of Health was conducting experimental studies using ketamine to treat depression, he gave them a call.