The World Health Organization recommends that the analysis of causality follow certain patterns. In its official website http://www.who-umc.org/DynPage.aspx?id=22682, there are general guidelines to determine if a suspected adverse reaction is related to drug use.
Therefore, a suspected adverse reaction can be:
- CERTAIN
- PROBABLE/ LIKELY
- POSSIBLE
- UNLIKELY
- CONDITIONAL/ UNCLASSIFIED
- UNASSESSIBLE/ UNCLASSIFIABLE
Uppsala Monitoring Centre
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