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Adverse effect (medicine)

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In medicine, an adverse effect is a harmful and undesired effect that results from a therapy like medication, chemotherapy, surgery or other intervention. An adverse effect may be called a "side-effect" (when it is less important than the therapeutic effect).

It may result from an unsuitable or incorrect dosage or procedure (which could be caused by medical error). Some adverse effects happen only at the beginning or a change of a treatment.

Reporting systems

In many countries, adverse effects have to be reported and researched in clinical trials and included into the patient information accompanying medical devices and drugs for sale to the public.

Examples of adverse effects associated with specific medications

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