Generally, your immune system is supposed to fight off the bacteria that make you sick. But sometimes your body fights the medicine itself. That’s what happen when you have a penicillin allergy, which is an abnormal reaction of your immune system to the antibiotic drug penicillin. Penicillin is prescribed for treating various bacterial infections.
If you have penicillin allergy, you may experience:
- Itchy, watery eyes
- Skin rash
- Shortness of breath
- Runny nose
You may also experience side effects of penicillin when you take it with other medications, which are not an allergic reaction to the drug. Depending on the type of penicillin, common side effects may include mild nausea or diarrhea, headache, or vaginal itching.