OTC is the abbreviation of Over The Counter in English, which refers to over-the-counter drugs in medical terms. The definition of OTC by the Medical Bureau of China's Ministry of Health is: OTC refers to drugs that consumers can buy directly from pharmacies or pharmacies without a doctor's prescription and can use safely without the guidance of medical professionals. Non-prescription drugs mainly include dietary supplements (including vitamins and minerals), skin drugs (including skin health products), cold and cough drugs, painkillers and gastrointestinal drugs. R is the mark of "registered trademark", which means that the trademark has applied for registration in the State Trademark Office and has been approved by the Trademark Office to become a registered trademark. R in the circle is the initial letter of English register registration. Registered trademarks have the characteristics of exclusiveness, exclusiveness and uniqueness. It belongs to the registered trademark owner and is protected by law. Without the permission or authorization of the registered trademark owner, no enterprise or individual may use it, otherwise it will bear tort liability.