Abstract
1 Injection of rats with morphine or methadone, before they received a water load equivalent to 5% of their body weight, produced a dose-dependent antidiuretic effect. Following the antidiuresis, urine was eliminated with kinetics similar to control untreated rats. 2 The antidiuretic effect of morphine or methadone was blocked by naloxone administered before the opiate, or reversed when given after the opiate. 3 Rats implanted with morphine pellets developed a marked degree of tolerance to the antidiuretic effect of morphine. Tolerance was also obtained on injection of three daily doses of morphine or methadone over two days. 4 Withdrawal symptoms were precipitated by naloxone in rats implanted with pellets of morphine; under these conditions the animals showed a marked reduction in urine production as compared to naive rats.
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