Quick answers
- What is Interferon BETA-1A used for?
- The FDA-approved label (Avonex, Biogen Inc., November 19, 2025) says: “AVONEX is indicated for the treatment of relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease, in adults. AVONEX is for the treatment of relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease, in adults.” This page is not medical advice. Talk to your doctor or pharmacist before you start, stop or change any medicine.
- Does Interferon BETA-1A have a boxed warning?
- No. None of the 2 FDA labels we found for this medicine has a boxed warning.
- Is there a shortage of Interferon BETA-1A?
- No current shortage is listed by the FDA for the products of this medicine (FDA data from October 30, 2026).
- Has Interferon BETA-1A been recalled?
- No recall linked to the products of this medicine appears in the FDA enforcement reports we use.
- Who makes Interferon BETA-1A?
- 2 companies list prescription products of Interferon BETA-1A in the FDA NDC Directory, including EMD Serono, Inc. and Biogen Inc..
What Interferon BETA-1A is used for
Quoted from the “Indications and Usage” section of the FDA-approved label.
AVONEX is indicated for the treatment of relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease, in adults. AVONEX is for the treatment of relapsing forms of multiple sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease, in adults.
— FDA label: Avonex, Biogen Inc., effective November 19, 2025. Read the full label on DailyMed →
The FDA has 2 labels for products of this medicine (different makers and forms); uses can differ between them. Check the label that comes with your own medicine.
This page is not medical advice. Talk to your doctor or pharmacist before you start, stop or change any medicine.
Conditions named on the label
These condition names appear word for word in the label’s “Indications and Usage” text (matched with a reviewed table). Each page lists hospitals whose own websites name the condition.
Related medical specialties
Boxed warning
A boxed warning (“black box”) is the FDA’s strongest warning on a drug label, for serious or life-threatening risks.
The label quoted above has no boxed warning.
0 of 2 FDA labels for this medicine have a boxed warning.
Forms and how it is given
| Dosage forms | Injection, solution |
|---|---|
| Route | Subcutaneous · Intramuscular |
| Prescription products | 6 in the FDA NDC Directory |
| Brand names | Rebif, Rebif Rebidose, Avonex, Avonex Pen |
What pharmacies pay (NADAC)
The National Average Drug Acquisition Cost (NADAC) is the average price U.S. retail pharmacies paid to buy one unit of a medicine (one tablet, one mL or one gram), from a monthly survey of pharmacy invoices by the Centers for Medicare & Medicaid Services (CMS). State Medicaid programs use it to pay pharmacies.
This is not the price you pay. What you pay depends on your insurance (copay or coinsurance), your pharmacy and any discounts, and pharmacies also charge for filling a prescription. Ask your pharmacist or your health plan what your price will be.
| Strength and form | Generic or brand | Pharmacies pay |
|---|---|---|
| interferon BETA-1A 44 ug/0.5 mL injection, solution | Brand: Rebif Rebidose | $1,848.67 per mL |
NADAC list of November 4, 2026; these prices took effect on January 3, 2026. Shown only where a package’s NDC code matches the NADAC list exactly, and only for that exact strength and form: nothing is averaged across strengths. Strengths and forms not listed here have no NADAC price.
Source: NADAC (National Average Drug Acquisition Cost) 2026, data.medicaid.gov (CMS) →
Companies that list this medicine
Labelers in the FDA NDC Directory: the company named on the package (maker or distributor), with the number of prescription products.
- EMD Serono, Inc.4 products
- Biogen Inc.2 products
FDA approval history
- BLA: Biologics License Application: how a biologic medicine (made from living cells) is approved.
| Application | Sponsor | Approved | Later changes approved |
|---|---|---|---|
| BLA103628 AVONEX | Biogen | May 17, 1996 | 22, latest July 28, 2023 2023: Labeling · 2021: Labeling · 2020: Efficacy |
| BLA103780 REBIF | Serono Inc | March 7, 2002 | 17, latest July 28, 2023 2023: Labeling · 2021: Labeling · 2020: Labeling |
Shortage status
The FDA drug shortage list does not show these products.
Recalls
No recall linked to these products (by their NDC code) appears in the FDA enforcement reports.
Official identifiers
Sources
- FDA-approved label on DailyMed (National Library of Medicine) — Avonex, Biogen Inc., effective November 19, 2025; via openFDA, FDA data exported October 30, 2026, retrieved October 31, 2026
- NDC Directory (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026
- Drugs@FDA (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026
- Drug recall enforcement reports (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 27, 2026, retrieved October 31, 2026
- Drug shortages (openFDA) — U.S. Food and Drug Administration (FDA), FDA data exported October 30, 2026, retrieved October 31, 2026
openFDA data is provided by the FDA as is; it may be incomplete. Always rely on the label that comes with your medicine. FDA Enforcement Report search →