Effects of tetrabenazine and phenylpiperidine analgesics during daily clorgyline treatment.

Pigeons responded under a multiple fixed-ratio 30-response, fixed-interval 5-min schedule of food presentation. Daily administration of clorgyline (10 mg/kg, IM) tended to decrease rates of responding in both schedule components. Before daily clorgyline, tetrabenazine had no effect or decreased responding in the FI component at doses that markedly increased responding during chronic clorgyline. The clorgyline treatment resulted in a slight increase in sensitivity to the rate-decreasing effects of morphine, but no increased sensitivity to the rate-decreasing effects of meperidine, anileridine, alphaprodine, or fentanyl.