Buspirone has been shown to increase serum prolactin.

Dinan TG, Yatham LN, Barry S, Chua A, Keeling PW (1990).  Serotonin
supersensitivity: the pathophysiologic basis of non-ulcer dyspepsia?  A
preliminary report of buspirone/prolactin responses.  Scand J Gastroenterol, 25,
541-544.

Frank J. Nice, DPA, CPHP