The effect of systemic administration of baclofen on food intake in rats.

The effects of systemic administration of the GABAB agonist, baclofen was investigated on food intake in non-fasted rats. Baclofen (1.0, 2.0 and 4.0 mg/kg, s.c.) produced a dose-related increase in food intake in a free-feeding paradigm during the first 90 min after administration, with maximum increases occurring at a dose of 2 mg/kg (Experiment 1). Baclofen (0.5 and 1.0 mg/kg, s.c.) also increased food intake in the 40 min post-drug recording period in non-fasted rats, trained to make operant responses for food on a fixed-ratio schedule (Experiment 2). These results demonstrate that systemic administration of baclofen can stimulate ingestive behaviour in satiated rats and suggest a possible role for a GABAB receptor-mediated mechanism in the control of food intake.