| 1st line opiate withdrawal seizures | 1st line polydrug withdrawal seizures | ||
| Phenobarbitone | 128 (73%) | Phenobarbitone | 134 (81%) |
| Morphine | 33 (19%) | Morphine | 14 (9%) |
| Benzodiazepines | 4 (2%) | Benzodiazepine | 7 (4%) |
| Phenytoin | 2 (1%) | Phenytoin | 3 (2%) |
| Methadone | 2 (1%) | Methadone | 2 (1%) |
| Combination therapy | 7 (4%) | Combination therapy | 5 (3%) |