| Code | Description | Comment | Version |
| AW | Abatement of event after product withdrawn | | added v2.3 |
| BE | Event recurred after product reintroduced | | added v2.3 |
| DR | Dose response observed | | added v2.3 |
| EX | Alternative explanations for the event available | | added v2.3 |
| IN | Event occurred after product introduced | | added v2.3 |
| LI | Literature reports association of product with event | | added v2.3 |
| OE | Occurrence of event was confirmed by objective evidence | | added v2.3 |
| OT | Other | | added v2.3 |
| PL | Effect observed when patient receives placebo | | added v2.3 |
| SE | Similar events in past for this patient | | added v2.3 |
| TC | Toxic levels of product documented in blood or body fluids | | added v2.3 |