Symptoms of anaphylaxis usually require treatment with epinephrine, by injection. People who have had anaphylaxis can carry a pre-loaded syringe containing epinephrine. This is the most important treatment for anaphylaxis symptoms, because it can help to prevent a blocked airway from throat swelling, which can otherwise result in suffocation. Symptoms can also be improved with antihistamines, anti-acid medicines known as "H2 blockers," and corticosteroids such as prednisone. It is important for a doctor to see you right away for allergy reactions that are severe, and for all reactions that are treated with epinephrine. Low blood pressure may need treatment with intravenous fluids or with medication to support blood pressure.