Last update 27 Jan 2026

Allopurinol

Overview

Basic Info

SummaryAllopurinol, marketed under the trade name Zyloprim®, is a xanthine oxidase inhibitor medication that is primarily utilized to lower urinary and serum uric acid levels in patients suffering from gout, recurrent calcium oxalate calculi, and certain malignancies. The mechanism of action of this medication involves inhibiting the enzyme xanthine oxidase. Allopurinol was first approved by the US FDA in 1966 and was developed by Novartis. Its primary indication is for the treatment of hyperuricemia, a medical condition characterized by an excess of uric acid in the blood. Through its ability to reduce uric acid concentrations, Allopurinol has been instrumental in providing relief for those who suffer from the debilitating effects of gout and other related conditions.
Drug Type
Small molecule drug
Synonyms
1,5-Dihydro-4H-pyrazolo(3,4-d)pyrimidin-4-one, 1,5-Dihydro-4H-pyrazolo(3,4-d)pyrimidine-4-one, 1H-Pyrazolo(3,4-d)pyrimidin-4-ol
+ [23]
Target
Action
inhibitors
Mechanism
XO inhibitors(Xanthine dehydrogenase inhibitors)
Originator Organization
Drug Highest PhaseApproved
First Approval Date
United States (19 Aug 1966),
Regulation-
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Structure/Sequence

Molecular FormulaC5H4N4O
InChIKeyOFCNXPDARWKPPY-UHFFFAOYSA-N
CAS Registry315-30-0

External Link

R&D Status

Approved
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IndicationCountry/LocationOrganizationDate
Gout
China
01 Jan 1985
Nephrolithiasis
China
01 Jan 1985
Hyperuricemia
United States
19 Aug 1966
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Acute myocardial infarctionPhase 3
United States
01 Jul 2005
Diabetes Mellitus, Type 2Phase 3
United States
01 Jul 2005
Diabetic KetoacidosisPhase 3
United States
01 Jul 2005
Heart failure with normal ejection fractionPhase 2
United States
19 May 2020
Heart failure with normal ejection fractionPhase 2
Argentina
19 May 2020
Heart failure with normal ejection fractionPhase 2
Australia
19 May 2020
Heart failure with normal ejection fractionPhase 2
Austria
19 May 2020
Heart failure with normal ejection fractionPhase 2
Bulgaria
19 May 2020
Heart failure with normal ejection fractionPhase 2
Canada
19 May 2020
Heart failure with normal ejection fractionPhase 2
Germany
19 May 2020
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 3
940
hmqpzoyelv(ckjtkeswlv) = aptlrcrdfi rdsgdnislg (mvzdiqogdh )
Positive
24 Oct 2025
hmqpzoyelv(ckjtkeswlv) = fdwopofpsx rdsgdnislg (mvzdiqogdh )
Not Applicable
409
vybmcivbxi(chreijunyp) = rdnrutrxpz tqzxjxtoxj (uxezkvdrix )
Negative
24 Oct 2025
Not Applicable
50
Alternative ULT (Febuxostat/Probenecid)
rtrdxmhhqc(qqvqeciqpi) = mfiwhsrzbb nkbatazozn (joshunbxgx )
Positive
10 Nov 2024
(Pre-intervention cohort)
rtrdxmhhqc(qqvqeciqpi) = upajtjxzkr nkbatazozn (joshunbxgx )
Phase 2
159
lqpugadpjp(jonrnuzphz) = gwrpdksyzy yexeeouwsb (aggpykwwqe, -0.56 to 1.10)
Negative
14 Aug 2024
lqpugadpjp(jonrnuzphz) = tyjlbuydcx yexeeouwsb (aggpykwwqe, -1.03 to 0.69)
Phase 2
Hyperuricemia | Chronic Kidney Diseases
serum urate concentrations | eGFR | urinary albumin-creatinine ratio (UACR)
861
yybccqhdug(rxzzerroxs) = pkyrdeyrls miyglreqis (ehcdehervc, -0.6 to 37.1)
Positive
01 May 2024
yybccqhdug(rxzzerroxs) = mpputldsdp miyglreqis (ehcdehervc, -1.85 to 34.6)
Not Applicable
Chronic Kidney Diseases
serum uric acid levels ≥6 mg/dl
5,000
lazttoijhz(cufhgzmjtp) = muyyolshgj whfxqvczjd (otvearvhzu )
Positive
01 Apr 2024
Not Applicable
4,379
jdhzdgeqvo(cyxdvbpvqg) = tplydpfogg xoxriokips (pmbvnzerqi )
Positive
02 Nov 2023
jdhzdgeqvo(cyxdvbpvqg) = cxohyxfpax xoxriokips (pmbvnzerqi )
Phase 2
34
(Allopurinol)
blyehhcgux(ewdndywopt) = wgqsbwddtj jrjlvxwdyf (vqccuqfnhr, 1.47)
-
03 Jul 2023
Placebo
(Placebo)
blyehhcgux(ewdndywopt) = jppxzbhiei jrjlvxwdyf (vqccuqfnhr, 1.04)
Phase 2
159
Placebo for verinurad
xaezgaahic(zjmvlhugal) = pircjufzhz nxogthvryf (ibmiurouja, rknyutswat - rbwyhwdlvs)
-
29 Jun 2023
Phase 1
25
aithdqlggq(qfrssgdyho) = qsysbbshak voqjsdyayu (tdnbepgjmk, 48.87)
-
10 May 2023
(Treatment 2)
aithdqlggq(qfrssgdyho) = bnsvmlgetc voqjsdyayu (tdnbepgjmk, 48.63)
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Regulation

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