FDA pharmacologic class
Xanthine oxidase inhibitors
2 medicines are in FDA's class of xanthine oxidase inhibitors (xanthine oxidase inhibitors): allopurinol (Aloprim) and febuxostat (Uloric). All 2 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is allopurinol 100 mg tablet at $0.0315 per tablet (NADAC).
Which medicines are xanthine oxidase inhibitors?
| Medicine | Brand names | Generic labelers (all forms) | Pharmacy cost | Boxed warning | Shortage | Recalls since 2012 |
|---|---|---|---|---|---|---|
| Allopurinol | Aloprim | 44 labelers | $0.0315 per tablet 100 mg tablet | No | A presentation being discontinued | 6 |
| Febuxostat | Uloric | 23 labelers | $0.191 per tablet 40 mg tablet | Yes | No current entry | 5 |
Source: FDA Established Pharmacologic Class (NDC Directory, openFDA); CMS NADAC of October 7, 2026; FDA shortages and recalls (FDA files October 8, 2026)
What do pharmacies pay?
Each medicine's most widely listed form, per unit, in the NADAC survey: what pharmacies paid, not what a patient pays; strengths differ, so compare like with like.
Source: CMS National Average Drug Acquisition Cost (NADAC) survey, October 7, 2026: what retail pharmacies paid per unit; not a counter price