Why are some felodipine sustained-release tablets called Boidin and others called Etexin?

Well, if a drug is patented by one manufacturer, it cannot be produced by other manufacturers. If the production is illegal, the drug will only be branded by the manufacturer of the drug. If no manufacturer applies for a patent for this medicine, many manufacturers can produce this medicine, and different manufacturers will indicate different trade names to indicate that they are produced by different manufacturers. The felodipine sustained-release tablets you mentioned belong to two different pharmaceutical companies.