Theophylline is metabolized to 1,3-dimethyluric acid (1,3-DMU), 3-methylxanthine (3MX), and 1-methylxanthine (1MX) mainly by CYP1A2, and 1MX is rapidly converted to 1-methyluric acid (1MU) by xanthine oxidase (1-3).
What does 1U stand for?
1U stands for 1-Methyluric Acid (caffeine metabolite)
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