We use all claim records related to the utilization of cardiovascular agents (i.e., all agents with 薬効分類コード211-219) from April 2009 to March 2019. We plan to construct a medical institution-patient-month panel dataset. For each year between 2009 and 2019, we focus on drugs with multisource up to date (i.e., both brand-name and generic versions are available). For each brand-name drug, we pair at least one generic drug to it with the same dosage form and strength. There are three possible pairs for a specific class of drugs, i.e., beta-blockers. Pair I contains three drugs: a brand-name tablet with strength at 20mg, and two generic-version tablets with the same strength. Essentially, a pair can have more than two brand-name/generic drugs. Pair II differs from Pair I, despite the same strength (20mg), because of the different dosage form (capsule). Pair III differs from Pair II, despite the same dosage form (capsule), because the strength of the brand name is 10mg. Thus, there could be multiple pairs for a specific class of drugs.