Explained in plain English

What is an allergic reaction?

An allergic reaction happens when the body's immune system overreacts to a normally harmless substance, treating it as a threat. In Ryan Swain's case, doctors described his experience with atomoxetine as a 'violent allergic reaction'. This can manifest in many ways, from mild rashes to severe, life-threatening responses like anaphylaxis, which can affect multiple body systems and require urgent medical attention.