The manufacturing, processing, re-packaging, packaging, storage, and distribution of Western medicinal products, including those only for export, shall comply with the good manufacturing practices for Western medicinal products adopted by the competent central health authority with reference to the Pharmaceutical Inspection Convention and Pharmaceutical Inspection Co-operation Scheme (PIC/S). Implementation of the aforesaid good manufacturing practices may be phased in; the items to which the phased-in implementation applies and the related schedules shall be announced by the competent central health authority.