text: CRH caused a rise in plasma ACTH after both loperamide (from 30 +/- 16.6 to a peak of 108 +/- 31 pmol/l) and placebo (from 98.5 +/- 47 to 211 +/- 61.7 pmol/l): the interaction between treatments and time was significant, and the first phase of CRH-induced << ACTH >> secretion was significantly lower after [[ loperamide ]].