What is the alternative for Epinephrine in ACLS?

Ref. API Textbook of Medicine. Pg. 284   Vasopressin was used as an alternative, but no more used in ACLS Vasopressin In high concentrations, it raises blood pressure by inducing moderate vasoconstriction, and it has been shown to be effective in asystolic cardiac arrest Vasopressin also is thought to cause cerebral vessel dilation and theoretically increase cerebral perfusion. Vasopressin may be given IV/IO or by endotracheal tube. 40 units of vasopressin IV/IO push may be given to replace the first or second dose of epinephrine