Table 1.

Drug-drug Interaction Rules by Severity

Interaction Severity*	Rules	Active Rules by Hospital
		A	B	C
1	8246	16	16	16
2	60833	73	74	74
3	7902	490	552	550

^*Severity scale provided by vendor

1 – minor drug interaction, 2 – moderate drug interaction, 3 – major drug interaction