Careful evaluation of the severity of the bite and the patient's sensitivity should be made before the use of antivenin.

In bites producing symptoms of this severity, antivenin must be given in amounts large enough to produce clinical improvement.

Ten to 20 units may be necessary to prevent the relapse that sometimes occurs after small doses of antivenin.

Antivenin—Antiserum is the keystone to the therapy of snakebite.