naltrexone doses as low as 0.03 mg/kg ( monkeys ) or 0.1 mg/kg ( pigeons ) and naloxone doses as low as 0.1 mg/kg ( monkeys ) or 1 mg/kg ( pigeons ) shifted morphine dose-effect curves by one or more log units to the right .
C0027360
naltrexone
C0027358
naloxone