The side effects of Yuanhu Pain Relieving Drops Pills are not clear at present. Yuan Hu Pain Relieving Drops Pills belongs to Chinese patent medicine, which consists of Yan Hu Suo in vinegar and Angelica dahurica, in which Yan Hu Suo in vinegar has the effect of regulating qi, activating blood circulation and relieving pain, while Angelica dahurica has the effect of dispelling wind and dispersing cold (dispelling the wind evils and dispersing the cold evils), clearing the orifices to relieve pain, activating blood circulation to drain pus, generating muscles to relieve pain, and drying dampness and stopping leucorrhoea (stopping leucorrhoea by drying the dampness), which together play the functions of regulating qi, activating blood circulation and relieving pain. Yuan Hu Pain Relieving Drops is often used in the treatment of cold pain in the abdomen during menstruation, dystocia (pain in the area of the ribs), headache and other conditions. Its adverse effects are not known. Caution should be exercised if there is deficiency of cold in the spleen and stomach (spleen and stomach weak and cold) and insufficient stomach yin (insufficient yin fluid in the stomach) for stomach pain. Use with caution in pregnant women. If there is a need for medication, it should be used under the guidance of a doctor to identify the symptoms, and should not be used blindly on its own to avoid adverse effects.