Biosimilars are biologic medical products that are almost identical copies of an original product that is manufactured by a different company. They are officially approved versions of original "innovator" products and can be manufactured when the original product's patent expires. Biosimilars are not to be confused with generic drugs, which are exact chemical replicas. Because biologics are made from living organisms, slight variations can occur, which is why biosimilars are considered “highly similar” rather than identical.
