You have a penicillin allergy if your immune system reacts abnormally when you take penicillin or any medicine containing penicillin. Signs and symptoms of penicillin allergy usually occur within an hour of taking a medication containing the substance. In some cases, you may experience symptoms hours, days, or even weeks later.
Signs and symptoms of penicillin allergy include:
- Skin rash
- Shortness of breath
- Runny nose
- Itchy, watery eyes
- Anaphylaxis* (life-threatening condition that impairs breathing and sends body into shock)
*You should call 911 immediately or go to the nearest hospital emergency room if you experience this serious symptom.
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