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. 2006 Dec 7;63(6):709–714. doi: 10.1111/j.1365-2125.2006.02809.x

Table 5.

Drug interactions classified with significance rating 1 and 2 in the DIF: how they were classified in other compendia

Vidal (%) BNF (%) Micromedex (%)
DIF NI CI A O NI H NH NI Maj Mod Min
S1 25.9 26.7 17.8 29.6 17.7 77.7 4.6 6.0 66.2 24.8 0
S2 43.9 5.0 14.6 36.5 30.0 18.3 51.7 18.5 12.1 64.6 4.8
Total 38.6 11.4 15.6 34.4 26.5 35.3 38.2 14.6 29.1 53.0 3.3

NI = not included. CI = contraindication. A = avoid. O = other categories including ‘to take into account’ and ‘precautions’. S = significance rating. Maj = major severity. Mod = moderate severity. Min = minor severity.