The function is mainly used to dispel wind and clear heat, relieve sore throat and penetrate rash, relieve phlegm and spasm. Used for wind-heat cold, sore throat, hoarseness, measles, rubella itching, red eyes, convulsion and tetanus.

Allergy should be "measles is impenetrable, rubella itches,"

I'm not sure about the rest. I coughed and lost my voice when I was a child. My family washed the cicada shells collected by themselves and boiled water for me to drink. I don't remember the effect. Anyway, I ate something else at that time, and I will be fine in a few days!