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Allopurinol is almost completely metabolized to oxipurinol within two hours of oral administration, whereas oxipurinol is slowly excreted by the kidneys over 18–30 hours. For this reason, oxipurinol is believed responsible for the majority of allopurinol's effect.
Methotrexate also indirectly inhibits purine synthesis by blocking the metabolism of folic acid (it is an inhibitor of the dihydrofolate reductase). Allopurinol is a drug that inhibits the enzyme xanthine oxidoreductase and, thus, lowers the level of uric acid in the body. This may be useful in the treatment of gout, which is a disease caused ...
Because xanthine oxidase is a metabolic pathway for uric acid formation, the xanthine oxidase inhibitor allopurinol is used in the treatment of gout. Since xanthine oxidase is involved in the metabolism of 6-mercaptopurine, caution should be taken before administering allopurinol and 6-mercaptopurine, or its prodrug azathioprine, in conjunction.
Gout is a disorder of purine metabolism, [5] and occurs when its final metabolite, ... Allopurinol blocks uric acid production, and is the most commonly used agent. [20]
Historically, heterozygous females were often diagnosed using an allopurinol challenge. In a female with reduced enzyme activity, an oral dose of allopurinol would be metabolized to oxypurinol ribonucleotide, which blocks the pyrimidine biosynthetic pathway. When this induced enzymatic block is combined with reduced physiologic enzyme activity ...
Allopurinol is metabolized to oxipurinol, a product with a far slower renal excretion rate than its parent compound. Renal impairment is associated with abnormally high blood levels of oxipurinol and an increased risk of developing the DRESS syndrome, particularly the more severe forms of this disorder.
ATC code M04 Antigout preparations is a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System, a system of alphanumeric codes developed by the World Health Organization (WHO) for the classification of drugs and other medical products.
For example, allopurinol is metabolized to oxipurinol, a product with a far slower renal excretion rate than its parent compound. Renal impairment is associated with abnormally high blood levels of oxipurinol and an increased risk of developing the DRESS syndrome, particularly the more severe forms of this disorder.