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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.