The narcotic antagonist naloxone enhances clinical pain.

Nature

Levine JD, Gordon NC, Jones RT, Fields HL. The narcotic antagonist naloxone enhances clinical pain. Nature. 1978 Apr 27; 272(5656):826-7.

1978
http://profiles.ucsf.edu/profile/83695491
347307

Levine JD, Gordon NC, Jones RT, Fields HL