Tiefenbacher, S., Davenport, M. D., Novak, M. A. et al. 2003. Fenfluramine challenge, self-injurious behavior, and aggression in rhesus monkeys. Physiology and Behavior 80(2-3), 327-331.

The present study examined serum prolactin and cortisol responses to the 5-HT releasing agent D,L-fenfluramine (FEN) in 24 individually housed rhesus monkeys (Macaca mulatta), 15 of which carried a veterinary record of self-wounding (SW). Prolactin and cortisol responses to FEN were unrelated either to wounding history or to rates of self-directed biting. However, there were significant inverse correlations between levels of aggression and the prolactin response to both doses of FEN. A dose-dependent response to FEN was observed only for prolactin, suggesting that this variable is more appropriate than cortisol as an endpoint for FEN challenge in monkeys.