The effect of
diphenylhydantoin on LD 50 of
ouabain was investigated in frogs, using "one hour frog
method".
LD50 of
ouabain in
control group was 1.90 microg/10g. A
dose of 100 microg/10g diphenylhydantion did not
affect the systemic manifestations of the frogs, but increase the
LD50 of
ouabain to 2.60 microg/10g. The difference of
LD50 of
ouabain and
potency ratio between
control group and
diphenylhydantoin-treated group was statistically significant.