RL65

From Smallville Wiki

RL65 is a drug developed by Dr. Pamela Black, a scientist hired by Oliver Queen's Queen Industries to develop a drug to speed up healing (Rage). The drug worked, but it also aggravates the amygdala-the part of the brain that manages aggression-in the process. RL65 thereby caused episodes of rage in patients who took the drug (much like steroids).

Lionel Luthor later used RL65 as a cover story in his dealings with Lex. After Chloe healed him from his gunshot wound, Lex woke up very confused about why he was completely fine. Lionel gave him a possible explanation: that he had saved a dose of RL65 for himself, but decided to use it on Lex instead (Fracture).