Drug concentrations (mean±SD (%); n=3) of butorphanol tartrate (50 μg/mL) and ropivacaine hydrochloride (1 mg/mL) in polyolefin bags at different storage conditions
| Time (h) | Solution stored at 4°C | Solution stored at 25°C | ||
|---|---|---|---|---|
| Butorphanol | Ropivacaine | Butorphanol | Ropivacaine | |
| 0 | 100.0 | 100.0 | 100.0 | 100.0 |
| 8 | 98.7±1.7 | 101.1±0.1 | 98.7±0.5 | 99.1±1.8 |
| 24 | 100.2±1.1 | 102.5±1.3 | 98.3±1.2 | 100.4±0.5 |
| 48 | 99.2±0.3 | 99.8±0.7 | 102.2±2.1 | 97.7±2.4 |
| 72 | 100.6±0.4 | 102.1±1.6 | 101.8±0.9 | 98.3±0.2 |
| 120 | 100.9±1.0 | 97.5±2.2 | 100.3±2.0 | 102.2±0.3 |
| 168 | 101.3±1.3 | 100.4±0.7 | 99.9±1.1 | 99.2±1.9 |
| 240 | 99.6±0.1 | 101.2±1.0 | 100.4±0.2 | 98.9±0.6 |
| 360 | 99.8±1.5 | 102.1±0.9 | 98.5±0.7 | 100.3±0.5 |