Yuan Hu Pain Relieving Drops Pill is a proprietary Chinese medicine preparation with the effects of regulating Qi, activating blood circulation and relieving pain. It is used for stomachache, dystocia (pain in the area of the ribs), headache and dysmenorrhea caused by qi stagnation and blood stasis (stagnation of blood due to lack of qi flow). The main ingredients of Yuan Hu Pain Relieving Drops Pills are Yan Hu Suo (延胡索) in vinegar and Angelica dahurica (白芷). Yanhuosuo is a drug that activates blood circulation and removes blood stasis (promoting blood circulation and eliminating blood stasis in the body). The use of vinegared Yanhuosuo in the formula can enhance the effect of moving qi and relieving pain (relieving pain by regulating the body’s qi). Angelica dahurica has the function of dispersing cold and relieving pain (relieving pain by removing cold from the body), which can treat pain caused by cold and dampness. The formula of the two can enhance the effect of relieving pain and activating blood circulation. It should be noted that it should be used with caution for those with stomach pain due to deficiency of cold in the spleen and stomach (weak and cold spleen and stomach) and insufficient stomach yin (insufficient yin fluid in the stomach); and pregnant women should be cautious in using this medicine. Taking this medicine needs to be under the supervision of a doctor.