1. When you first get the medicine, you can observe it from the appearance of the packaging. Really imported drugs generally have Chinese and English introductions to the drug name, trademark, ingredients, usage and dosage, etc. If you see a drug that is all introduced in English and has no Chinese words, then you can doubt the way it came from.

2. Secondly, you can know the authenticity from the registration certificate number. To sell imported drugs in China, they must obtain a registration certificate number. For foreign drugs, it is an "Imported Drug Registration Certificate", and for Hong Kong, Macau and Taiwan, it is a "Pharmaceutical Product Registration Certificate" number. These numbers will be printed on the exterior packaging and instructions.

3. Finally, it is still impossible to determine the authenticity through the above two methods. Please check it from the official website of the State Food and Drug Administration. The steps are as follows, log in to the website and click on data query. You can select imported drugs from the drugs and click to enter. Then you will see the quick query below. Enter the name of the drug you want to query, and you can see the detailed description of the drug.