Medicines that primarily promote vomiting are called emetic medicinals. Any toxins, phlegm, or retained food in the upper parts such as the throat or chest can be expelled through induced vomiting to achieve the goal of eliminating pathogenic factors. However, most of these medicines are somewhat toxic, and the act of vomiting is intense. Improper use can lead to adverse effects, so these medicines are limited to individuals with strong pathogenic qi and sufficient healthy qi, and are contraindicated for those with deficiency. When using them, a gradual increase in dosage is often adopted to prevent overdose, poisoning, or excessive vomiting. After taking the medicine, it is advisable to drink plenty of hot water to enhance its efficacy. Additionally, immediate eating should be avoided to prevent stomach discomfort.

External medicines refer to those administered primarily through external routes to treat diseases. They are mainly suitable for conditions such as abscesses, scabies, insect bites, and trauma. Administration methods include ointments, fumigation, washing, topical application, throat sprays, nasal drops, and eye drops. Since most of these medicines are toxic, dosage and administration routes should be strictly controlled to avoid poisoning.