Table 5.

Hartwig and Siegel severity scale

Level description
Level 1: An ADR occurred but required no change in treatment with the suspected drug.
Level 2: The ADR required that treatment with the suspected drug be held, discontinued, or otherwise changed. No antidote or other treatment requirement was required. No increase in length of stay
Level 3: The ADR required that treatment with the suspected drug be held, discontinued, or otherwise changed, and/or an antidote or other treatment was required. No increase in length of stay.
Level 4: Any level 3 ADR which increases length of stay by at least 1 day.
Level 5: Any level 4 ADR which requires intensive medical care.
Level 6: The adverse reaction caused permanent harm to the patient.
Level 7: The adverse reaction either directly or indirectly led to the death of the patient.