To buy and distinguish the authenticity of drugs, we must first look at whether the drug packaging is "No.3 complete", that is, 1 and the approval number. If it is a Chinese patent medicine, add the letter Z after the Chinese medicine standard, if it is a western medicine, add X, if it is an imported medicine, add J, and add Arabic numerals after the letter, with a specific document number. 2. Production batch number. 3. Production date and validity period. If there is a third product, you can check whether it is a officially approved drug on the website of the State Food and Drug Administration according to the approval number above. If you see pieces of Chinese herbal medicine (which need to be fried one by one), you can't buy them. Because all the pieces are prescription drugs, you need a doctor's prescription to take them. Traditional Chinese medicine decoction for sale as a patent medicine must have a production license approved by the state and formal packaging, and it must be available on the third. Drugs that do not meet the above basic conditions are counterfeit drugs. For the sake of your health and life safety, please be careful to buy drugs online.