THE SELECTIVE D-2-DOPAMINE-RECEPTOR ANTAGONIST ETICLOPRIDE COUNTERACTS THE EJACULATIO-PRAECOX INDUCED BY THE SELECTIVE D-2-DOPAMINE AGONIST SND-919 IN THE RAT

The selective D-2 antagonist eticlopride, at a dose (0.01 mg/kg, s.c.) that fails to modify the normal behavior of rats, significantly reversed all the behavioral effects exerted by the selective D-2 agonist SND 919 (0.1 mg/kg, i.p.), namely, the stimulation of stretching-yawning, penile erection and sedation and the inhibition of grooming. In the copulatory test, eticlopride at the same dose did not affect animal sexual behavior but potently counteracted the reduction in mount and intromission frequency and latency to ejaculation induced by SND 919 at 0.1 mg/kg, a behavioral pattern which might possibly be proposed as an animal model for human ejaculatio praecox.