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Naltrexone decreases both ethanol and sucrose seeking. Naltrexone (1 mg/kg s.c.) administered 30 min before the start of the session significantly inhibits active lever pressing for both 10% ethanol (A) and 5% sucrose (B). The values are expressed as mean no. of active lever presses ± SEM (paired Student's t test). *, P < 0.05; **, P < 0.01 compared with vehicle, n = 7–8.
