Penicillin Allergy Symptoms

Penicillin effectively treats conditions caused by a bacterial infection. Although penicillin isn't effective against conditions caused by viruses such as colds, the flu or even chicken pox, this antibiotic has been used to treat strep throat, ear infections and other bacteria-based illnesses. According to the National Science Foundation, researchers are considering penicillin coating for surgical tools and implants as a way to prevent post-surgical staph infections. Unfortunately, penicillin can also cause an allergic reaction in some patients. The Centers for Disease Control and Prevention reports that approximately 3 percent to 10 percent of the population is allergic to penicillin. For these patients, penicillin use can be dangerous.

Skin Symptoms

Many patients demonstrate outward signs of a penicillin allergy. Raised bumps that are often red and itchy begin to appear on the skin. These bumps or hives can vary in size and intensity and sometimes persist for hours or days. Other patients may experience a rash that appears a few hours or even days after taking penicillin. Itching may occur with or without the onset of hives or a rash.

Respiratory

An anaphylactic or serious reaction to penicillin can become life-threatening if the reaction involves the airway. In some patients, the throat constricts or the patient's tongue swells and affects her ability to continue breathing. The restricted airways can also cause a drop in blood pressure and can lead to shock because the organs are not receiving adequate blood flow.

Other Warning Signs

As the flow of oxygen and blood is restricted, patients may experience dizziness or even fainting as well as nausea or vomiting. Changes in blood pressure may also affect the patient's heart and cause the pulse to become weak and rapid, or cause his skin to appear flushed or pale. Any of these symptoms can be indicators of a life-threatening reaction and require immediate medical attention. It's important to inform your physician about any prior allergic reaction to penicillin in order to avoid another reaction.