These special Genjutsu Pills (幻術屋久, Genjutsu Yaku, literally meaning: Illusion Technique Pills) were developed by Orochimaru. Once ingested, the pills will cast a genjutsu on the target that paralyses the body. The drugs also affect the target's mind to some degree as Gyūki had troubles remembering his last rampage after Blue B took the pills.
