Washing your hair with Soapwort He Shouwu Sapindus can help to kill insects and stop itching and so on. However, due to the toxicity of the drug, it is not recommended to use on their own. Soapwort has the efficacy of expelling phlegm and relieving cough, opening and closing the orifices, killing insects and dispersing knots. It is used for phlegm cough and asthma, stroke and silence, phlegm and saliva congestion (abnormal phlegm, excessive production of saliva), dizziness, epilepsy, laryngeal paralysis (pharyngeal redness, swelling and pain, or dryness, foreign body sensation, or pharyngeal itching and discomfort, difficulty in swallowing), inability to pass the stool, carbuncle, swelling, and scabies. It is forbidden to be taken by those who are physically weak, pregnant women or those who have hemoptysis. He Shou Wu has the function of tonifying the liver and kidney, benefiting the essence and blood, black hair, and is mainly used for treating deficiency of essence and blood, dizziness, early whitening of hair, lumbar and knee soreness, malaria, carbuncle and gangrene (a kind of venomous sores, acute suppurative diseases occurring on the body surface, limbs and internal organs), scrofula (mainly refers to cervical lymph node tuberculosis), etc. It is not recommended to take it if there is loose stools or if there is no dryness, or if there is itching and discomfort in swallowing, or if the person who is pregnant has hemoptysis. It should be noted that people with loose stools and damp phlegm should take it with caution. Sapindus has the efficacy of clearing away heat, expelling phlegm, eliminating accumulation and killing worms. It can be used to treat paralysis and swelling of the throat, coughing and wheezing with lung heat, hoarseness, food stagnation, chancre, abdominal pain of roundworm, trichomonas vaginitis, ringworm, and swelling and poisoning. Caution should be exercised for those with deficiency and coldness of the spleen and stomach (spleen and stomach weak and cold). The adverse reactions and contraindications of the above drugs are not known. Soap horn and Sapindus indica have small toxicity and are mainly used externally to kill worms to treat ringworm, while He Shouwu is used externally with other traditional Chinese medicines for rubella and itching. Therefore, decoction of the above medicines to wash the head has a certain effect of killing insects and stopping itching. Before using traditional Chinese medicine, you need to ask your doctor for identification and use it under the doctor’s guidance, so as not to use improper medication and delay the condition.