Effects of verapamil on the acute toxicity of doxorubicin in vivo.

BACKGROUND Studies indicating that verapamil substantially enhances doxorubicin levels in certain drug-resistant tumor cells have led to the use of verapamil in combination with doxorubicin in animal and clinical studies of multidrug-resistant tumors. These studies have shown this drug combination to be associated with severe toxic effects. It is important… (More)