In clinical settings, when administering tetanus injections, it is very easy for allergic reactions to occur, even severe complications like anaphylactic shock. In such cases, the following emergency measures can be taken:

First, establish an intravenous access immediately, then start the patient on infusion therapy;

Second, if the patient experiences a drop in blood pressure, vasopressor agents can be used for pressor therapy;

Third, it's essential to provide the patient with cardiac monitoring, oxygenation, and other supportive treatments. In addition, it's crucial to use anti-allergy medications. There are many anti-allergic drugs available clinically, and the specific medication to be used should be decided based on the patient's specific condition.

(Please administer medications under the guidance of a professional physician, and do not self-medicate.)