Can new drugs be produced and sold with patents?

Patent right is exclusive right, not production right. That is, having the patent right, others may not produce, sell, promise to sell (advertise) and use (unlimited appearance) without the authorization of the patentee.

To produce, according to the product type, those with approval number should be approved, those that should meet the national mandatory standards should meet the corresponding standards, drug production should meet the pharmaceutical production standards, and food should meet the food production standards.