FDA pharmacologic class
Purine Antimetabolite
2 medicines are in FDA's class of purine antimetabolites: azathioprine (Imuran) and cladribine (Mavenclad). All 2 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is azathioprine 50 mg tablet at $0.124 per tablet (NADAC).
Which medicines are purine antimetabolite?
| Medicine | Brand names | Generic labelers (all forms) | Pharmacy cost | Boxed warning | Shortage | Recalls since 2012 |
|---|---|---|---|---|---|---|
| Azathioprine | Imuran, Azasan | 17 labelers | $0.124 per tablet 50 mg tablet | Yes | No current entry | 1 |
| Cladribine | Mavenclad | 6 labelers | n/a | Yes | No current entry | 0 |
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