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Eight sodium dithiocarbamates (NaS2CNR1R2) have been examined as antidotes for acute cadmium intoxication. While all of them possess an ability to increase survival when given to mice 2 hr after a lethal (greater than 99%) intraperitoneal injection of 10 mg/kg of CdCl2 X 2.5H2O, their effects on the organ distribution of cadmium vary considerably. It has been possible to show that the accumulation of cadmium in the brain and kidney as well as the survival rates can be correlated with a numerical measure of the polarity of the groups R1 and R2. Each factor has a different dependence on the polarity, but it is possible to construct a composite factor for antidotal efficacy which incorporates survival rate, brain cadmium levels and kidney cadmium levels. The factor constructed here exhibits an optimal value approximately in the middle of the polarity range studied. Compounds which have R1 = -CH2CH1OH and R2 = -CH2CH2OH, or -CH3 or -C2H5 appear to be the most effective antidotes of the compounds examined.

Structure-activity relationships among dithiocarbamate antidotes for acute cadmium chloride intoxication.