**Question:** A patient with anaphylactic shock, after receiving penicillin injection comes to you, which of the following life-saving treatment you would take into consideration:

A. Administer adrenaline
B. Administer corticosteroids
C. Administer antihistamines
D. Administer oxygen therapy

**Core Concept:** Anaphylaxis is a severe, life-threatening systemic allergic reaction involving histamine, cytokines, and other mediators. It presents with acute onset of symptoms affecting multiple organ systems. Penicillin is a common allergen that can trigger anaphylaxis.

**Why the Correct Answer is Right:**

In cases of anaphylactic shock, the correct treatment involves addressing the underlying cause and managing the immediate symptoms. Penicillin is a common allergen, and its administration can lead to anaphylaxis. In such cases, adrenaline (epinephrine), a potent vasoconstrictor and bronchodilator, is the first choice for treatment.

**Why Each Wrong Option is Incorrect:**

1. **Administer corticosteroids (Option B):** Corticosteroids are used to suppress inflammation but are not effective in treating anaphylaxis. Administering corticosteroids in this context would be inappropriate and potentially counterproductive, as they could exacerbate the inflammatory response.

2. **Administer antihistamines (Option C):** Antihistamines are used to block histamine action, which is a key mediator in anaphylaxis. However, in anaphylactic shock, an immediate response is needed, and administering antihistamines would be too slow and ineffective.

3. **Administer oxygen therapy (Option D):** While oxygen therapy is important for patients with anaphylaxis, especially those with respiratory compromise, it is not a direct treatment for anaphylaxis itself. Administering oxygen therapy alone would not adequately address the immediate life-threatening symptoms caused by anaphylaxis.

**Clinical Pearl:** Administer adrenaline, also known as epinephrine, as it addresses the immediate symptoms of anaphylaxis and provides a dual action: vasoconstriction to minimize tissue hypoxia and bronchodilation to relieve airway obstruction. Oxygen therapy should be provided simultaneously to support respiratory function, but adrenaline is crucial for treating the underlying cause and managing the symptoms of anaphylactic shock.