This study aims to classify the business models of pharmaceutical firms in Thailand. Through qualitative analysis of 12 in-depth interviews, the study identified 7 key themes (market, customer, product, price, strategy, cost management, performance) to classify business models as public health, innovative, or mixed. A public health model focuses on accessible pricing and standard products for public markets. An innovative model focuses on premium pricing and first-in-class products for private/self-pay markets. Many firms use a mixed model balancing public health and innovative approaches. The classification provides guidance for pharmaceutical management in determining suitable business models.