Ren Dan has the effects of clearing away heat, relieving summer heat, inducing resuscitation and stopping vomiting. If the weather is too hot, causing dizziness, headache, nausea and chest tightness, you can take Ren Dan to relieve it. However, it should also be noted that Rendan contains cinnabar and should not be taken in excess to prevent mercury poisoning. Pregnant women, young children and "three highs" elderly people should use it with caution or disable it. Such drugs include Piwendan, Shidishui, Huoxiang Zhengqi Water, etc. It is a good medicine to dispel summer evil.