Where is Huanglian Shangqing Tablet produced best?

Beijing Tongrentang is better. In fact, Huanglian Shangqing Tablet, a very common medicine, can be produced by most Chinese medicine manufacturers, as long as it is not a fake medicine. Shandong Xianhe Pharmaceutical, Shaanxi Panlong Pharmaceutical, Chaohu Gina Pharmaceutical, Guizhou Bailing, Henan Wanxi Pharmaceutical, Shanxi Kaiyuan Pharmaceutical and Shuanghe Pharmaceutical are all good, and there are many more, so I won't list them here.