Unlike common side effects, it is dose-independent and may occur even with prior use of the medication without any reaction.
Allergic reactions to medications can range from mild to severe—and in some cases, even life-threatening. Knowing how to identify the symptoms and act quickly is essential to avoiding complications.
What is drug allergy?
It is an exaggerated response by the immune system to a drug considered "foreign" by the body. Unlike common side effects, it does not depend on the dose and can occur even with drugs that have been used previously without any problems.
What are the most common symptoms?
Signs of drug allergy may appear within minutes or even hours after use and include:
- Intense itching and redness of the skin;
- Hives (red, raised patches);
- Swelling of the face, lips, eyes, or throat (angioedema);
- Difficulty breathing;
- Wheezing;
- Dizziness or drop in blood pressure;
- Fever or feeling unwell.
In the most severe cases, anaphylaxis may occur, a generalized allergic reaction that requires immediate medical attention.
What to do in case of an allergic reaction to medication?
- Consult your doctor or trusted pharmacist and report the symptoms you are experiencing, as well as the name of the medication(s) you are using.
- Seek urgent medical attention if you have difficulty breathing, swelling of the face, or feel faint.
- Avoid self-medicating with antiallergic drugs without professional guidance, as this can mask symptoms and make diagnosis difficult.
- Record the name of the medication causing the allergy and always inform your doctor, hospital, or pharmacy when you visit.
Prevention: the best approach
- Always inform your healthcare professional about any known drug allergies.
- Keep the packaging or name of the medication that caused the reaction.
- Wear allergy bracelets or ID cards, especially if the reaction was severe.
- Never take medication on your own, even if it "seems harmless."
Drug allergy is a serious condition, but with attention to symptoms and quick action, complications can be avoided. Diagnosis and follow-up should always be performed by specialized healthcare professionals.
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