1. Unnecessary drug therapy
2. Needs additional drug therapy
3. Ineffective drug
4. Dosage too low
5. Adverse drug reaction
6. Dosage too high
7. Noncompliance
1 limited memory capacity
2 limited mental processing capacity
3 negative effects of fatigue other stressors
1 Generalized lack of awareness that causes errors
2 Patients suffer adverse events much more often than previously realised
3 Errors often NOT immediately observed