The usage of Psidium Guajava Pi Injection mainly includes intramuscular injection, intravenous injection and intravenous drip. Psidium guajava pericarp injection is a proprietary Chinese medicine, which has the efficacy of moving qi and removing fullness, opening the chest and removing paralysis, and is mainly used for the treatment of stable angina pectoris and coronary heart disease with phlegm and turbidity blocking the collaterals. Guaopi injection can be used by intramuscular injection, intravenous injection and intravenous drip, of which intravenous injection and intravenous drip need to be diluted with dextrose injection before use. Allergic patients need to be careful with this drug, allergic to this drug, pregnant women and when the drug properties change should be prohibited from use. Since drug interactions may occur when this drug is used together with other medications, it is important to follow medical advice when using this drug.