2. It is believed that the inventor of "Bai Tong Pill" was Wu Youlan, a doctor in the Qing Dynasty, who improved it according to the ancient prescription. However, this statement is doubtful and lacks conclusive evidence. There is little information about Wu Youlan's life. He is mainly famous for publishing Lin Yi's Correction. Whether he really developed the "Bai Tong Pill" remains to be verified.
3. More data show that the invention and dissemination of "Bai Tong Pill" should originate from the people, and its specific producer and invention time are unknown. The names of prescriptions prescribed by folk doctors in different periods and regions are similar according to their own experience, but the specific prescriptions may be different. This also makes it more difficult to judge the exact source of Bai Tong pills.
4. At present, the products of "Bai Tong Pill" circulating in the market are also produced by different manufacturers, but the specific ingredients and origin are different, but they are all called "Bai Tong Pill". This also brings some troubles, and it is difficult to judge which product is the most original and authentic "Bai Tong Pill".
To sum up, it can be considered that the exact producer and source of "Bai Tong Pill" is difficult to verify. It originated from ancient prescriptions and was improved and passed down by folk doctors in different periods and regions. It is considered to be an effective anti-inflammatory and analgesic drug, which is highly praised by some people. However, the information about its specific inventor and original formula needs further professional research and excavation.