Abstract: A medicine for filterable virus infections and its processing method, based on the theory of the traditional Chinese medicine. The main material used is pericarpium citri reticulatae (hereinafter referred to as “PCR”) ground into powder after being stir-baking and burning to carbon black. After mixed with certain primary agent, the medicine in the present invention may be made into medical ointment for external use or powder or pill for oral medication, which is eutherapeutic to viral infections, such as lip boil, human papilloma virus (HPV), herpes zoster, genital herpes, chickenpox, influenza and virus diarrhea.