Received from NORML:

A primary compound in marijuana, delta-9-tetrahydrocannabinol (THC), is effective in reducing "tics" in patients suffering from Tourette's Syndrome (TS), according to clinical trail data published in a recent edition of the Journal of Clinical Psychiatry. Tourette's Syndrome is a complex neuropsychiatric disorder characterized by motor tics (sudden spasms especially in the facial muscles, neck and shoulders) and one or more vocal tics.

Twenty-four patients participated in the double-blind placebo-controlled trial over a period of six weeks. Treatment with up to 10 mg of THC resulted in significant improvement of tic severity, authors wrote. No serious adverse effects to the treatment were reported.

In a separate article published in Neuropsychopharmacology, authors elaborated, "No detrimental effect was seen on learning curve, interference, recall and recognition of word lists, immediate visual memory span, and divided attention" from THC during or after the treatment.