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. 2006 Nov 20;63(3):258–267. doi: 10.1111/j.1365-2125.2006.02797.x

Table 2.

Structured assessment of drug–drug interactions: categories for the quality of evidence [27, 36]

Category Description
0 Pharmacodynamic animal studies; in vitro studies with a limited predictive value for the human in vivo situation; data on file
1 Incomplete, published case reports (no re- or dechallenge, presence of other explanatory factors for the adverse reaction)
2 Well-documented, published case reports; retrospective analyses of case series
3 Controlled, published interaction studies in patients or healthy volunteers with surrogate end-points
4 Controlled, published interaction studies in patients or healthy volunteers with clinically relevant end-points
Posters and abstracts from scientific meetings: 0 or 1, depending on the information provided. When the information of the poster or abstract is not published in a peer-reviewed journal within 3 years after the scientific meeting, this information is recategorized as 0
Information from the Summary of Product Characteristics/European Public Assessment Report (EPAR): 0, 1 or 2, depending on the information provided
Retrospective case series: 2 or 3, depending on the information provided