Definition · Plain-language
CIOMS form
The CIOMS form is the internationally recognised standard format for reporting individual case safety reports of suspected adverse drug reactions between regulators, companies and other parties.
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What the CIOMS form is
The CIOMS form is a standardised reporting format developed by the Council for International Organizations of Medical Sciences (CIOMS), an international body that has produced widely adopted guidance on pharmacovigilance. The best-known version, CIOMS I, is the classic single-page form for transmitting an individual case safety report of a suspected adverse drug reaction. It provides a common structure so that the essential elements of a case can be communicated in a consistent way between regulatory authorities, marketing-authorisation holders and other organisations internationally.
What it captures
A CIOMS I form records the core data needed to describe and assess a suspected adverse reaction case: identifying details about the patient (in de-identified form), the suspected medicinal product and its dosing, the description and timing of the reaction, the outcome, relevant medical history and concomitant medicines, and information about the reporter and the sender. Capturing these elements in a standard layout allows the receiving party to evaluate and, where required, enter the case into pharmacovigilance systems with the necessary minimum information.
Its place in modern reporting
Historically the CIOMS I form was the principal vehicle for cross-border exchange of individual case safety reports. Much routine reporting has since moved to electronic transmission using the international ICH E2B standard for structured electronic ICSRs, which databases like EudraVigilance and FAERS rely on. Nonetheless, the CIOMS form remains a recognised and still-used format, and the term endures as shorthand for the standardised case-report concept it introduced. The CIOMS organisation also produces influential guidance beyond the form itself.
Key facts
At a glance
- Definition: Internationally recognised form for reporting individual case safety reports.
- Specific version: CIOMS I (the classic single-page ICSR form).
- Developed by: Council for International Organizations of Medical Sciences (CIOMS).
- Captures: Patient, suspect product, reaction, outcome, reporter details.
- Used between: Regulators, marketing-authorisation holders and other parties.
- Modern context: Electronic ICSRs use the ICH E2B standard.
Common misconceptions
What people often get wrong
Often heard: There is only one CIOMS document and it is the reporting form.
Actually: CIOMS produces a body of pharmacovigilance guidance through its working groups. The CIOMS I form is the well-known reporting format, but "CIOMS" refers to the organisation and its wider outputs too.
Often heard: The CIOMS form is mainly used for communication with patients.
Actually: It is used to exchange individual case safety reports between regulators, companies and other organisations — a regulatory and industry instrument, not a patient-facing one.
Often heard: Submitting a CIOMS form confirms the drug caused the reaction.
Actually: The form reports a suspected adverse reaction. It documents a case for assessment; it does not establish causation.
Going deeper
