Serum Sickness (Allergic Reaction to Amoxicillin)

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Amoxicillin for an Ear Infection

When my daughter was diagnosed with an ear infection, we never anticipated the subsequent medical journey that would unfold. What began as a standard course of amoxicillin quickly turned into a concerning situation, as a severe allergic reaction emerged, leading to a series of urgent care visits and an eventual diagnosis that required swift intervention.

My 6 year old daughter had to take amoxicillin for an ear infection. She has taken amoxicillin before many times and never had a reaction. After a week of medication, a rash and hives suddenly appeared on her side and back. The next day, the rash spread rapidly and worsened, covering her entire back, stomach, neck, and back of her legs.

Urgent Care for Hives

We visited urgent care, where they prescribed Zyrtec and suggested that the rash was likely an allergic reaction to the amoxicillin. They advised us to discontinue the amoxicillin and prescribed Zyrtec and Benadryl around the clock to manage the intense itching and spreading rash.

However, the next day, the rash continued to worsen, affecting her back, stomach, underarms, and legs. Concerned about her condition, we returned to urgent care. During our visit, she complained of knee pain and difficulty walking. While descending stairs, she sat down and stated that she couldn’t walk. Additionally, she developed a low-grade fever of 100.5 degrees Fahrenheit.

The doctors performed tests for the flu and COVID-19, but they couldn’t find any evidence of these infections. They reviewed the progression of the rash, which had spread significantly since our previous visit. Based on this information, they suspected that it might be serum sickness, a delayed reaction to amoxicillin that typically develops seven days after the medication is taken.

Emergency Room for Hives, Fever, and Joint Pain

In response to this diagnosis, they advised us to seek immediate medical attention at the emergency room. Upon arrival, the doctors conducted blood work and administered an intravenous infusion of steroids. These treatments proved effective, allowing her to regain mobility and the rash to start receding.

To further investigate the cause of her reaction, they suggested that we undergo an allergy test with an allergist who said you can’t test for allergies related to this.