(ESTIMATED PUB DATE) USE OF DILUTE AQUEOUS SOLUTION (5 MCG/ML) OF A BENZIMIDAZOLE DERIVATIVE WITH POTENT MORPHINE-LIKE ACTIONS ORALLY AS A PRESUMPTIVE REINFORCING AGENT IN CONDITIONING OF DRUG-SEEKING BEHAVIOR IN THE RAT

1.��� � ��� �-� 200 mg/kg of morphine by subcutaneous injection once daily for several months), likewise showed no apparent aversion to the 1.4-2 solution (5-meg/rill) when water-deprived. These animals were tested just prior to their regular daily dose or morphine, when the acute effects of the previous day's dose (tail rigidity, hyperactivity) were no longer apparent, and when they were exhibiting signs of morphine-abstinence, notably, repeated discrete twitches of the skin of the back, resemb...