Distribution Vd exceeds total body water content, suggesting localization in some body tissue, probably liver. Not appreciably bound to proteins.
Metabolism Extensive major metabolite is 5-amino-imidazole-4 carboxamide.
Elimination Biphasic, initial t ½ is 19 min and terminal t ½ is 5 h; 40% excreted unchanged in urine in 6 h.
Special Populations Hepatic Function Impairment
Initial t ½ increased to 55 min and terminal t ½ increased to 7.2 h in a patient with renal and hepatic function impairment.
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