1. Skin Rashes or Hives
Patients allergic to antivirals may develop red or inflamed skin shortly after taking the medication. This can manifest as generalized or localized rashes or hives, typically characterized by flat red patches or raised, itchy welts on the skin.
2. Difficulty Breathing
Difficulty breathing may occur due to the allergic reaction causing swelling in the airways, making it hard to breathe. This and other respiratory symptoms such as wheezing, chest tightness, coughing, or shortness of breath, can be dangerous if not promptly managed.
3. Swelling of Lips, Face or Tongue
Some people allergic to antivirals may experience swelling of the lips, face, throat, or tongue. This is known as angioedema and is potentially life-threatening due to the risk of airway obstruction if not addressed quickly.
4. Abdominal Pain and Nausea
Abdominal discomfort and nausea can be signs of an allergic reaction. The patient may experience a severe stomach ache, diarrhea, or vomiting. Nausea caused by allergic reactions is independent of eating food.
5. Dizziness or Fainting
An allergic reaction to antivirals may also lead to dizziness or fainting. This is usually caused by a drop in blood pressure (hypotension) and can be accompanied by a rapid heartbeat or palpitations.
6. Anaphylaxis
Anaphylaxis is a severe and potentially lethal allergic reaction that requires immediate medical attention. It includes many of the symptoms listed above such as difficulty breathing, swelling, and dizziness, and can also lead to a sudden drop in blood pressure, confusion, loss of consciousness, and even death if not promptly treated.
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