What are signs of anaphylaxis to a medication and the initial actions?

• A. Rash only.
• B. Nausea only.
• C. Headache only.
• D. Skin hives, swelling, wheezing, throat tightness, hypotension; call for help, administer epinephrine per protocol, monitor closely.

Answer: (D)

Anaphylaxis is a rapid, life-threatening allergic reaction that affects more than one body system. The signs reflect both skin involvement and airway or circulatory problems, such as hives or swelling on the skin plus wheezing or throat tightness and a drop in blood pressure. Because of this multi-system involvement, these symptoms together indicate a true anaphylactic reaction rather than a mild or single-system allergy.

Rash alone, nausea alone, or headache alone can occur with allergies or other conditions but do not define anaphylaxis. The priority is to act quickly when the reaction involves airway or breathing difficulties or low blood pressure, or when there are multiple affected systems.

Initial actions are urgent: recognize the seriousness, call for help, and administer epinephrine as soon as protocol allows (usually an intramuscular dose in the thigh). Then monitor the patient closely, keep them in a safe position that supports breathing and circulation, and be prepared to repeat epinephrine if symptoms persist or recur and to provide further emergency care as needed. Epinephrine works by reducing airway swelling and improving blood pressure and airway flow, which is why timely administration is essential to prevent progression.