FDA pharmacologic class
Aromatase inhibitors
3 medicines are in FDA's class of aromatase inhibitors (aromatase inhibitors): anastrozole (Arimidex), letrozole (Femara) and exemestane (Aromasin). All 3 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is anastrozole 1 mg tablet at $0.142 per tablet (NADAC).
Which medicines are aromatase inhibitors?
| Medicine | Brand names | Generic labelers (all forms) | Pharmacy cost | Boxed warning | Shortage | Recalls since 2012 |
|---|---|---|---|---|---|---|
| Anastrozole | Arimidex | 24 labelers | $0.142 per tablet 1 mg tablet | No | No current entry | 4 |
| Letrozole | Femara | 19 labelers | $0.145 per tablet 2.5 mg tablet | No | No current entry | 1 |
| Exemestane | Aromasin | 10 labelers | $0.748 per tablet 25 mg tablet | No | 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