Pathologic Function
side effect
Definitions related to adverse effects:
  • (side effect) A problem that occurs when treatment affects healthy tissues or organs. Some common side effects of cancer treatment are fatigue, pain, nausea, vomiting, decreased blood cell counts, hair loss, and mouth sores.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • (side effect) An unwanted, and sometimes dangerous, reaction caused by medication or other treatment.
    Harvard Dictionary of Health Terms
    Harvard Medical Publishing, 2011
  • (side effect) The term was used in various ways in the past, to describe unintended effects of medical intervention, usually negative (unfavourable), but also positive (favourable) ones. It is recommended that this term no longer be used and particularly should not be regarded as synonymous with adverse event or adverse reaction.
    NCI
    U.S. National Cancer Institute, 2021
  • (side effects) Any actions or effects of a drug or treatment other than the intended effect. Negative or adverse effects may include headache, nausea, hair loss, skin irritation, or other physical problems. Experimental drugs must be evaluated for both immediate and long-term side effects.
    CDISC Terminology
    Clinical Data Interchange Standards Consortium (CDISC), 2021
  • (therapy adverse effect) The unintended, deleterious effects of licit therapies, that are properly administered; for adverse or side effects of pharmaceuticals use DRUG ADVERSE EFFECT; for erroneous administration of therapies see PATIENT SAFETY/MEDICAL ERROR.
    CRISP Thesaurus
    National Institutes of Health, 2006
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This content should not be used in place of medically-reviewed decision support reference material or professional medical advice. Some terms may have alternate or updated definitions not reflected in this set. The definitions on this page should not be considered complete or up to date.