Confusing drugs with similar names constitute about 10% of all medication errors. The American Pharmacists Association reported that there are more than 33,000 trademarked medication names in the United States and more than 9,000 generic names (American Hospital Association, 2005). In this study, all participating hospitals reported LASA-related medication errors, both from the governmental and from the private sector. Most participants are affiliated with primary hospitals (62.34%) the most prevalent type of hospitals nationwide (730 hospitals, 91.7%) (Ministry of Public Health, 2011). These institutions provide primary health care for the most patients, resulting in highest workload for physicians in Thailand, followed by physicians in secondary, tertiary, university and private hospitals, respectively. Although most LASA reports came from respondents affiliated with primary or community hospitals, the overall response rate was low (11.16% or 154 completed questionnaires), perhaps due to Thailand’s insufficient medication-error-reporting infrastructure, such as MEDMARX® and USP-ISMP and due the voluntary nature of reporting (Ministry of Public Health, 2011; Macagba, 2011). It is also worth noting that there are no comparable data available from specialty hospitals and military hospitals, because they did not return the questionaire. The Joint Commission on Accreditation of Healthcare Organizations now requires that accredited health care organizations develop and maintain programs to minimize these LASA medication risks; a good example of this is the annual report list of