Anaphylaxis is a severe, potentially life-threatening allergic reaction that can occur within seconds or minutes of exposure to an allergen like bee venom or peanuts. Common symptoms involve the skin, respiratory tract, heart, and gastrointestinal system, such as hives, difficulty breathing, dizziness, and nausea. Epinephrine is the first line treatment and should be injected immediately to help lower the risk of complications. Antihistamines and bronchodilators may also be used to treat specific symptoms of anaphylaxis.