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| Drug | Concentration (μg mL−1) | Intra-day (n = 5) | Inter-day (n = 15) | ||
|---|---|---|---|---|---|
| Concentration (μg mL−1) | RSD (%) | Concentration (μg mL−1) | RSD (%) | ||
| Metoprolol | 0.5 | 0.51 ± 0.02 | 3.92 | 0.52 ± 0.03 | 5.77 |
| 5 | 4.03 ± 0.13 | 3.23 | 4.12 ± 0.18 | 4.37 | |
| 20 | 20.43 ± 1.07 | 5.24 | 20.86 ± 1.22 | 5.85 | |
