The case of a patient who developed catatonia one week following Lyser
gic Acid Diethylamide (LSD) ingestion is presented, The psychosis deve
loped two days after the intake, The catatonic syndrome resolved drama
tically following one treatment of electroconvulsive therapy (ECT). Th
is is perhaps the first case report of catatonia following the use of
LSD. The need for a diagnostic category of organic catatonia is highli
ghted.