Biosimilars: current perspectives and future implications.

Biosimilars are biological products that are the replicas of their innovator biopharmaceuticals. These are developed after patent expiration of innovator biopharmaceuticals and are submitted for separate marketing approval. In view of the structural and manufacturing complexities of biopharmaceuticals, biosimilars should not be considered as "biological generics". These are rather unique molecules with limited data at time of approval, so there are concerns about the safety and efficacy of biosimilars. This article will address the differences between biosimilars and chemical generics, issues of concern with the use of biosimilars and need of appropriate regulations for their approval.