These three all need to apply for a legal license such as retail and wholesale need to drug business license and GSP certification.
Medical institutions need a medical practice license.
Then you have to have a legal purchase channel. Purchasing channels are wholesale enterprises, manufacturing enterprises.
Wholesalers must have a drug license and GSP certification.
Manufacturing companies have to have a drug production license and GMP certificate.
Lastly, the purchase of drugs is a legitimate product
Drugs have to have a registered approval, equivalent to a person's ID card, and then have to sell you the batch of drugs factory test report.
Additionally, the drugs have to be inspected for quality, to see if there are any quality problems and if they have exceeded the expiration date.
Additionally, there are restrictions on the sale of medicines, for example, if you are a retailer and your sales target is a patient, then the sale of prescription medicines, you also have to ask for a prescription, and you can't sell termination of pregnancy medicines, and the sale of ephedrine-containing medicines is limited to a certain number.
If you are a wholesale company and your sales target is also a wholesale company, then you also need to collect each other's license. If you are a retailer, you also need to collect each other's qualifications and licenses. After reviewing and signing the agreement then you can sell to each other.
There are many more requirements. You can look at the quality management standard of drug business