1. After entering the website of the Food and Drug Administration, we click on the "information disclosure" column on the home page (red box below 1) to enter the "data query" sub-column (underlined below).
2. After entering the query bar, if you don't know which option to choose, you can use "Advanced Query". We can check one or more of the approval number, product name, trade name and production unit of the drug to be verified in the advanced query.
3. The batch number of each conventional drug is unique. For those health care products produced with the batch number of Weijianzi and counterfeit drugs produced with the batch number of others, we only need to check the batch number in the Food and Drug Administration and compare the batch number in the results with the manufacturer's situation to know whether it is true or not.