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Noun
1. side effect; adverse reactionMedicine
Wikipedia definition
2. Adverse effectIn medicine, an adverse effect is a harmful and undesired effect resulting from a medication or other intervention such as surgery. An adverse effect may be termed a "side effect", when judged to be secondary to a main or therapeutic effect. If it results from an unsuitable or incorrect dosage or procedure, this is called a medical error and not a complication. Adverse effects are sometimes referred to as "iatrogenic" because they are generated by a physician/treatment.
Read “Adverse effect” on English Wikipedia
Read “副作用” on Japanese Wikipedia
Read “Adverse effect” on DBpedia

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