What are the signs of an allergic reaction to medication?

The signs of an allergic reaction to medication primarily involve the immune system's response to a substance it identifies as harmful. Rash, itching, and swelling are common manifestations of such reactions. A rash may appear as hives, which are raised, red areas on the skin, while itching often accompanies these skin changes. Swelling, particularly in areas like the face, lips, or throat, indicates a more severe reaction known as angioedema, which can threaten airway function. Recognizing these symptoms is crucial for prompt intervention, as allergic reactions can escalate quickly and may require medical attention.

In contrast, signs such as headache and fatigue, nausea and diarrhea, or blurred vision and confusion are typically associated with other types of drug side effects or complications, not necessarily allergic reactions. Understanding the distinctive signs of an allergic reaction helps caregivers effectively monitor and respond when these situations arise.