Drug concentrations (mean±SD (%); n=3) of butorphanol tartrate (50 μg/mL) and ropivacaine hydrochloride (2 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 | 100.1±0.5 | 100.9±0.2 | 100.6±0.7 | 100.7±0.6 |
| 24 | 100.9±2.0 | 99.9±1.6 | 99.7±1.1 | 99.6±0.2 |
| 48 | 101.8±1.0 | 100.0±0.5 | 101.1±0.9 | 102.5±1.3 |
| 72 | 102.1±1.9 | 99.3±1.0 | 102.6±0.8 | 101.4±2.1 |
| 120 | 99.5±0.2 | 99.6±1.2 | 99.4±0.7 | 99.7±1.6 |
| 168 | 100.5±0.8 | 100.2±0.8 | 98.5±1.3 | 101.0±1.4 |
| 240 | 101.0±1.3 | 101.5±0.3 | 100.3±1.1 | 99.6±0.8 |
| 360 | 99.2±0.4 | 100.1±1.1 | 97.7±0.5 | 101.8±0.9 |