During an anaphylactic attack, the emergency team may perform cardiopulmonary resuscitation (CPR) if you stop breathing or your heart stops beating. To ease your symptoms, you may be given other medications such as: Epinephrine (adrenaline) to suppress your body's allergic reaction Oxygen, to help you breathe Intravenous (IV) antihistamines and cortisol to reduce inflammation and improve breathing.