What does "Adverse reaction" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
An adverse reaction, in the context of medicine, refers to an unwanted or harmful effect that a person experiences after taking a medication or receiving a treatment. It can range from minor issues like a rash or stomach upset to serious problems such as liver damage or a severe allergic reaction. These reactions can occur immediately or may develop over time. They can happen with any type of treatment, including prescription drugs, over-the-counter medications, and even natural or herbal remedies.
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