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Changes in the blood levels of caffeine and its metabolites over time.
| Elapsed time from visit [h] | 0 | 7 | 12 | 24 | 48 | 69 | 75 | |
|---|---|---|---|---|---|---|---|---|
| Blood concentration[μg/m L] | Caffeine | 384.96 | 245.99 | 87.23 | 55.20 | 7.51 | 1.72 | 1.24 |
| Paraxanthine | 6.48 | 15.13 | 11.18 | 8.09 | 2.47 | 0.99 | 0.98 | |
| Theobromine | 1.32 | 2.55 | 2.37 | 1.49 | 0.56 | 0.29 | 0.30 | |
| Theophylline | 0.50 | 1.12 | 0.91 | 0.86 | 0.22 | 0.07 | 0.07 | |
Note: Blood tests performed more than 40 h after initiating CHD show that the patient's blood levels are below the toxic range for the first time.
