Is rebif a biologic?

Is Rebif considered a biologic drug?

Yes. Rebif (interferon beta-1a) is classified as a biologic medicine. It is an interferon product made by biological manufacturing processes rather than by standard chemical synthesis, which is how biologics are generally defined.

What exactly is Rebif (and why it’s grouped with biologics)?

Rebif contains interferon beta-1a, a protein-based therapy used for multiple sclerosis. Because it’s a manufactured protein therapeutic (produced through biologic manufacturing), it falls under the biologic/biopharmaceutical category rather than a small-molecule drug category.

Is it the same as a biosimilar?

No. Rebif itself is the reference/brand biologic product. Biosimilars are different products that are made to be highly similar to a specific reference biologic and are evaluated through a separate biosimilar pathway.