More than a generation later, Peter Gasser and others have reignited the study of LSD’s medical potential. In a recent paper published online this month in the Journal of Psychopharmacology, he and his co-authors report on their efforts to incorporate the chemical into psychotherapy sessions with 12 patients. Most of them had terminal cancer, and severe anxiety.

During sessions, half the patients were given a low, sub-effective dose of LSD, and half were given a moderately high amount (200 micrograms). Those who took low doses did not show improvements in anxiety levels, while those who got the full dose did. The former group was then given the option of taking the larger amount in a subsequent session.

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