Karrak

Karrak was a spice variant peddled by spice dealers and studied by the Imperial Science Bureau during the Galactic Civil War.

Description
A powerful painkiller known for its degenerative toxins, karrak was pushed by spice dealers as a medicine. While karrak suppressed most symptoms, its degenerative toxins would build up after long-term use and cause more harm then good. As it did not actually cure users of their ailments, dealers hoped to continue to sell their products to ailing buyers until their ultimate death.

Aside from its use as a faux-medicine, the Imperial Science Bureau discovered that karrak suppressed a user's ability to use the Force for forty-eight hours. While Imperial scientists attempted to refine or duplicate the properties, the Imperial Security Bureau began developing improved forms of the spice and distributed it to agents tasked with hunting fugitive Force-sensitives.