Collaboration with Dr Torsten Passie

In 2010, we collaborated on a pilot study demonstrating that 2-bromo-LSD (a non-psychoactive analogue of LSD) could stop or reduce the frequency of cluster headaches, a debilitating condition with almost no treatment options.

Torsten Passie has also coauthored a comprehensive book on LSD, that was published by the Beckley Foundation press.

He was also involved in a recently published study showed the safety and efficacy of LSD-assisted psychotherapy in patients with anxiety associated with life-threatening diseases (Gasser et al. 2014). Participants of the study were included in a qualitative psychological study including a prospective follow-up.


Our publications:



Hintzen A & Passie T (2010). The pharmacology of LSD. OUP Oxford.


LSD-assisted psychotherapy for anxiety associated with a life-threatening disease: a qualitative study of acute and sustained subjective effects. Gasser P, Kirchner K, Passie T (2015). J Psychopharmacology



Safety and efficacy of lysergic acid diethylamide-assisted psychotherapy for anxiety associated with life-threatening diseases. Gasser P, Holstein D, Michel Y, Doblin R, Yazar-Klosinski B, Passie T, Brenneisen R (2014). J Nerv Ment Dis.


The non-hallucinogen 2-bromo-lysergic acid diethylamide as preventative treatment for cluster headache: An open, non-randomized case series. Karst M, Halpern JH, Bernateck M & Passie T (2010). Cephalalgia.