FDA pharmacologic class
Interferon beta
2 medicines are in FDA's class of interferon betas: interferon beta 1a (Avonex) and peginterferon beta 1a (Plegridy). 0 of the 2 are listed from generic labelers (FDA NDC Directory, October 8, 2026). The lowest pharmacy cost is rebif rebidose 44 mcg/0.5 ml at $1,848.67 per mL (NADAC).
Which medicines are interferon beta?
| Medicine | Brand names | Generic labelers (all forms) | Pharmacy cost | Boxed warning | Shortage | Recalls since 2012 |
|---|---|---|---|---|---|---|
| Interferon beta 1a | Rebif, Avonex | none listed | $1,848.67 per mL 44 mcg/0.5 mL | No | No current entry | 0 |
| Peginterferon beta 1a | Plegridy | none listed | n/a | 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