morphine ( 10 mg ) , methadone ( 10 mg ) , pentazocine ( 30 mg ) , nalorphine ( 10 mg ) and 0.25 mg of the met-enkephalin analogue , damme , all caused similar increases in circulating prolactin with falls in serum lh and cortisol .
C0014295
met-enkephalin
C0949300
damme