Transparency in business practice is a necessary factor that leads to good governance and anti-corruption practice in the industry. Consequently, the first code of practice in the world was published by Association of the British Pharmaceutical Industry (ABPI) in 1958. Later, International Federation of Pharmaceutical Manufacturers Association ( IFPMA) also created the first code of practice for their members which are world-wide research-based pharmaceutical companies. As IFPMA member, Pharmaceutical Research and Manufacturers Association (PReMA) created and implemented the first code of practice for its members in Thailand in 1986 under the name “P.P.A Code of Pharmaceutical Marketing Practices”. In the same year, World Health Organization also released its code of practice. In the past 30 years, the code compliance subcommittee has consequently revised and updated PReMA code mainly based on APEC Mexico City Principles for Voluntary Code of Business Ethics in the Biopharmaceutical Sector and IFPMA Code of Practice 2012 to reflect changes in the market and new laws and regulations. The most current PReMA Code of Practice is PReMA Code of Practice for Ethical Channel, 10th Edition, 2016. In addition to hospital channel, PReMA also released and implemented PReMA Code of Sales & Marketing Practices for Drugstore, Drugstore Operator and Drugstore Operator Who Sells Pharmaceutical Products. The most updated edition is 3rd Edition, 2011.