Follow-On Biologic
A Follow-On Biologic is a biologic product developed to be highly similar to an already-approved reference biologic, broadly synonymous with a biosimilar, intended to offer comparable safety and efficacy at lower cost once the originator's exclusivity expires.
What is a follow-on biologic?
A follow-on biologic is a biologic product developed to be highly similar to an already-approved reference biologic. The term is broadly synonymous with biosimilar and describes a product designed to match the original closely in structure and clinical effect.
Because biologics are large, complex molecules made in living systems, a follow-on biologic cannot be an identical copy the way a small-molecule generic can. Instead, it must demonstrate that there are no clinically meaningful differences from the reference product in safety, purity, and potency.
Why do follow-on biologics matter?
Follow-on biologics are intended to offer comparable safety and efficacy at lower cost once the originator's market exclusivity expires. By introducing competition into a class of expensive therapies, they can expand patient access and reduce spending.
Their availability reshapes formulary decisions and contracting throughout the pharmaceutical and payer landscape. As more reference biologics lose exclusivity, follow-on products become an increasingly important lever for managing drug costs.
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