Overview
Allopurinol is a purine analogue that revolutionized gout treatment when introduced in 1966. As a competitive inhibitor of xanthine oxidase, it effectively lowers serum urate levels by blocking the conversion of hypoxanthine to xanthine and xanthine to uric acid. The drug is listed on the WHO Essential Medicines List and remains the first-line urate-lowering therapy globally. Its chemical structure (C5H4N4O) mimics hypoxanthine, enabling targeted enzyme inhibition with high specificity.
Physical and Chemical Properties
This heterocyclic compound appears as a white crystalline powder with moderate thermal stability, decomposing rather than melting at high temperatures. Its limited water solubility (about 0.5 mg/mL at 25°C) influences pharmaceutical formulation design. The planar molecular structure contributes to its enzyme-binding characteristics. Allopurinol demonstrates stability in acidic conditions but may degrade under strong oxidation or prolonged UV exposure, necessitating protective packaging.
Main Applications
Primary indications include chronic gout management (reducing attack frequency) and prevention of tumor lysis syndrome uric acid nephropathy. Off-label uses encompass Lesch-Nyhan syndrome and recurrent calcium oxalate stones with hyperuricosuria. In industrial contexts, allopurinol serves as a reference standard in analytical chemistry and biochemical research, particularly in studies of purine metabolism and oxidative enzymes. Veterinary applications mirror human uses for urate control in animals.
Safety and Storage
The compound requires careful handling due to potential hypersensitivity reactions, including Stevens-Johnson syndrome. Proper storage involves temperature-controlled environments (15-25°C) with desiccants to prevent hydration. Pharmaceutical manufacturers must comply with GMP standards for containment, as airborne powder may cause respiratory irritation. Shelf life typically reaches 36 months when stored in original sealed containers protected from light.
B2B Procurement Guide
Bulk pharmaceutical buyers should prioritize suppliers with WHO-GMP or FDA-approved facilities. Key evaluation criteria include: HPLC purity certificates (>99.5%), residual solvent analysis, and microbial limit tests. Procurement contracts should specify particle size distribution (critical for tablet formulation) and polymorphic form (Form I preferred). MOQs generally start at 1kg for API purchases, with price breaks at 10kg and 50kg quantities. Lead times average 4-6 weeks for international shipments.
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