'저문의약품' is considered as a typo of '전문의약품'. 전문의약품 can be translated in 'ethical drug' which is the most commonly used in medical field, it need a prescription of a medical doctor in South Korean. In addition, 'prescription drug' can be used in 'Specialized Drug' or 'Professional Medicine' which are used in various documents. However, 'prescription drug' is recommendable. On the other hand, 'over the counter drug' does not need any prescription from medical doctors, can be purchased in pharmacies.