| Medication selection (n = 54) | Incorrect drug selection | 21 |
| Contraindication (including allergies) | 19 |
| Order omitted (to start or stop) | 8 |
| Duplicates (same or similar drugs) | 3 |
| Non-formulary selection | 1 |
| Expired product | 1 |
| Misplaced product | 1 |
| Dose (n = 53) | Incorrect dose | 47 |
| Dose omitted | 6 |
| Communication (n = 22) | Problem with pharmacy | 10 |
| Problem with patient | 8 |
| Problem with clinicians/staff in clinic | 3 |
| Problem with others in another clinic | 1 |
| Prescription (n = 20) | Insufficient information | 10 |
| Did not send prescription | 8 |
| Illegible | 1 |
| Misplaced prescription | 1 |
| Frequency (n = 8) | Inappropriate frequency (not enough or too much) | 8 |
| Documentation (n = 8) | Medication list not updated in medical record | 8 |
| Patient information (n = 4) | Wrong patient | 3 |
| Patient information not updated | 1 |
| Drug monitoring (n = 4) | Inadequate monitoring (subtherapeutic or supratherapeutic) | 3 |
| Lab test omitted | 1 |
| Quantity (n = 3) | Inappropriate quantity | 2 |
| Quantity omitted | 1 |
| Device (n = 1) | Malfunction | 1 |
| Insufficient information (n = 1) | Insufficient information from report to classify | 1 |
| Total | | 178 |