What Does a Penicillin Allergy Look Like?

This condition is one of the common symptoms seen in most allergic reactions. It is quite rare, but it can also be severe and life-threatening. Anaphylaxis can lead to a widespread dysfunction of the systems in the body. Symptoms include: sudden drop in the blood pressure, lightheadedness, diarrhea, vomiting, trouble breathing, cramps in the abdomen, seizure attacks, rapid pulse rate, nausea, and loss of consciousness.