Both thyrotropin-reieasing hormone (TRH) and amphetamine antagonize pentobarbital. They are more effective in the day than at night. This is true for TRH even when the dose of pentobarbital is increased at night to prolong sedation. Under this condition the day-night difference is lost for amphetamine. Both substances are more effective in cold ambient temperatures (18 °C) and less effective in warm temperatures, but their activity at warmer temperatures (37 °C) is still substantial. In contrast, somatotropin release-inhibiting factor (SRIF) augments the effects of pentobarbital at room temperature. This action is unaffected by time of day. However, the increase in sleeping time is lost in both a warm environment and in a cold environment.

Keywords:
Pentobarbital, Sedation, Hypothermia, Thyrotropin-releasing hormone (TRH), Somatropin release-inhibiting hormone (SRIF), Somatostatin, Amphetamine
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© 1975 S. Karger AG, Basel
1975
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