The expiration date of paraffin oil is generally 24 months, and about 2 months after opening. Medical paraffin oil is commonly used in the clinic, when doing gastroscopy or colonoscopy, you need to use paraffin oil lubrication, when doing rectal diagnosis, or when constipation occurs, you need to apply paraffin oil, when using paraffin oil, you need to observe the expiration date, generally 24 months, about 2 months after the opening, do not apply expired paraffin oil, or there is a risk of infection. After the organism has undergone lesions, such as constipation, intestinal obstruction, gastric diseases, colorectal diseases, etc., when diagnosing and treating these diseases, sometimes it is necessary to apply paraffin oil, which needs to be applied by medical personnel or under the guidance of medical personnel, and should not be applied by oneself.