What does it mean that the calcium tablet says sdyy?

Sdyy written on calcium tablets means pharmaceutical industry. According to relevant public information, sdyy is the abbreviation of "Shandong Medicine", which generally refers to the pharmaceutical industry in Shandong Province. Shandong Province is the largest pharmaceutical production base in Chinese mainland. The pharmaceutical industry in Shandong Province is developing rapidly, and there are many pharmaceutical production enterprises and pharmaceutical management enterprises.