ACTIMMUNE vs VERSAPEN

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated June 7, 2026·How we rate

Possible drug interaction. ACTIMMUNE and VERSAPEN are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.

Attribute	ACTIMMUNE	VERSAPEN
Rating	New	New
Pharmacy pays	—	—
Type	RX	RX
Active ingredient	INTERFERON GAMMA-1B	HETACILLIN
Manufacturer	Horizon Therapeutics Ireland Dac	Bristol
Dosage forms	Injectable	—
Drug class	Interferon Gamma	—
Boxed warning	None	None
Treats	Bacterial Infections, Brain Neoplasms, Renal Cell Carcinoma	Bacterial Infections

actimmune versapen

Rating

New

Pharmacy pays

—

Type

Active ingredient

INTERFERON GAMMA-1B

HETACILLIN

Manufacturer

Horizon Therapeutics Ireland Dac

Bristol

Dosage forms

Injectable

—

Drug class

Interferon Gamma

—

Boxed warning

None

Treats

Bacterial Infections, Brain Neoplasms, Renal Cell Carcinoma

Bacterial Infections

Frequently asked questions

What is the difference between Actimmune and Versapen?

Actimmune contains Interferon Gamma-1b, while Versapen contains Hetacillin — they have different active ingredients.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.