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