Final answer:
When a patient on beta-blockers develops anaphylaxis, the primary treatment is an epinephrine injection. To support the treatment, antihistamines and corticosteroids are usually administered alongside epinephrine to help with histamine-induced symptoms and inflammation.
Step-by-step explanation:
If a patient on beta-blockers (BB) develops anaphylaxis, the primary treatment is an epinephrine injection. Epinephrine is crucial as it increases blood pressure, relaxes bronchial smooth muscle, and modulates heart rate, which counteracts the life-threatening symptoms of anaphylaxis. In conjunction with epinephrine, it is generally recommended to administer antihistamines and corticosteroids. Antihistamines can help control histamine-induced symptoms such as itching and hives, while corticosteroids may help reduce inflammation and prevent late-phase allergic reactions. However, the effectiveness of antihistamines and corticosteroids in this context is based on theoretical considerations rather than robust clinical evidence.