The formula of Er Zhen Drink is petunia seeds, neem, fennel, and sansha beads. The efficacy of Erzhen Drink is to clear away dampness and heat, and promote urination, treating the symptoms of impassable urination, difficulty in urination, and even occlusion of urination, etc. It consists of petunia seeds, neem, cumin, and shanjiazhu. In Erzhen Drink, Petunia seeds are bitter and cold in nature, which belong to lung, kidney and large intestine meridian, and have the efficacy of draining water to pass stools, eliminating phlegm and cleansing drink, killing worms and attacking accumulation; Neem seeds are bitter and cold in nature, which belong to liver and triple jiao meridian, and have the efficacy of dispersing and diarrheal heat from the liver, moving qi to alleviate pain (relieving pain by adjusting the qi in the human body), and killing worms. Fennel in this formula is pungent and warm in nature, belonging to the liver, kidney, spleen and stomach meridians, with the effects of dispersing cold and relieving pain (relieving pain by dispelling cold in the body), regulating qi and harmonizing the stomach; and Andrographis paniculata is salty and slightly cold in nature, belonging to the liver and stomach meridians, with the effects of invigorating blood circulation and removing stagnation in the blood, facilitating the operation of blood and eliminating blood stasis in the body, promoting the flow of blood and eliminating the stagnation of blood in the body, promoting menstruation to lower lactation, and draining pus to eliminate swelling. Croton is prohibited when taking this medicine. Note that it is contraindicated for those who are allergic to the constituents of this formula, and should be used with caution by allergy sufferers. This drug needs to be used under the guidance of a physician, do not take it blindly on your own, so as not to lead to adverse consequences.