Side Effect

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A side effect, or adverse reaction, is an unintended response to a medication. Side effects are generally regarded as being harmful, and may occur after a single dose or prolonged administration. They might result from the normal use of a medicine, or from the use of a medicine in a way unintended by the marketing authorisation holder (MAH) – such as taking an overdose or from the combination of two or more medicines being taken at once.

Synonyms:
adverse reaction, adverse reactions
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