“Further, Matsumoto & Horita (1962) and Day (1962) have shown that the adrenergic neurone blocking effect of bretylium is reversed by amphetamine.”
“It is interesting in this connection that Brodie, Chang & Costa (1965) showed that the uptake of bretylium in the rat heart was inhibited by amphetamine although it was not made certain whether the inhibition of bretylium binding is associated directly with the antagonism of adrenergic neurone blockade.”
“On the other hand, the anti-hypertensive effect of bretylium is antagonized by amphetamine (Wilson & Long, 1960).”