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Stock solution stability tests for the determination of tadalafil in rat plasma (n = 6).
| Storage conditions | Concentration added (ng/mL) | Tadalafil | |
|---|---|---|---|
| RSD (%) | RE (%) | ||
| Ambient, 24 h | 25 | 4.19 | 2.3 |
| 500 | 2.30 | 3.1 | |
| 1500 | 1.12 | 2.7 | |
|
| |||
| Three freeze-thaw | 25 | 2.34 | −2.4 |
| 500 | 2.17 | 3.7 | |
| 1500 | 1.43 | −5.4 | |
|
| |||
| −80°C, 4 weeks | 25 | 4.03 | 3.9 |
| 500 | 2.81 | −2.7 | |
| 1500 | 1.21 | 3.1 | |
