Merge9 (also known by its trade name Empathin) is one of the drugs available in Bay City. A stronger version of Merge5 this biochemical pheromone designed to "put bodies in touch with one another" and cause powerful sexual arousal and enhanced physical sensations is hard to come by and exceedingly expensive. Miriam Bancroft and many female meths, have designer clone bodies that secrete merge9 when they experience arousal. Miriam uses this drug to seduce Takeshi Kovacs into making love to her while being watched by a bug.

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