Biopharmaceutical medicines are complex molecules obtained from a living organism (plant or animal cells) and may contain components of a living organism using biotechnology. Biosimilars are closely similar to already approved biopharmaceutical products that could form a new generation of medicines that are available widely at an affordable cost. The expiry of patent and data protection of Remicade (infliximab) aggravated biosimilar acceptance in the open market. Analysis of data package submitted for infliximab biosimilar and assessment reports published by agencies shows the importance of European Medicines Agency (EMA) product-specific guidelines (monoclonal antibodies) that are being followed by different regulatory agencies worldwide. Considering utilization of case-by-case basis for biosimilar development, infliximab biosimilar product evaluation assessment report suggests similarity in nature and extent of data required in analytical, nonclinical, and clinical studies even on utilizing cell lines different from the reference product's. Specific additional clinical study (phase III) is required for a biosimilar to be authorized by the Ministry of Health, Labour and Welfare (MHLW). US Food and Drug Administration and EMA widely accept the concept of extrapolation to other indications approved for the reference product. However, the Ministry of Health, Labour andWelfare, Japan shows a conservative approach for extrapolation to other indications in the absence of direct or indirect safety and efficacy data.