Do you need to announce the formula and process after the generic drug patent expires?

No need. According to the provisions of the Measures for the Administration of Drug Registration, the application for generic drugs should meet the following conditions: generic drugs should have the same active ingredients, routes of administration and therapeutic effects as generic drugs, including oral administration and injection, and the therapeutic effects include therapeutic purposes and characteristics; There are many synthetic routes to prepare the same active ingredient, and there is no patent restriction, which can be used to prepare generic drugs; If the prescription process is restricted by the patent, the reasons for choosing the prescription process should be explained, so it is not necessary to publish the formula and process after the generic drug patent expires.