Actions of etorphine hydrochloride, (M99): a potent morphine-like agent.

the presence of the antagonist was determined. Log (x -1) was plotted against the negative logarithm of the molar dose (per 100 g body wt.) of the antagonist. Finally, the pA2 value for the antagonist, which may be obtained from the point of intersection of the regression line with the abscissa (&child, 1947; Arunlakshana & Schild, 1959; Cox & Weinstock, 1964), and its standard error were calculated.

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