The method of taking simethicone oil before having a colonoscopy is to take simethicone oil emulsion 3 times a day, 2 ml once a day, and 2 ml early in the morning of the day of the colonoscopy, or to take this product as prescribed by the doctor. The generic name of this product is simethicone oil emulsion, which is usually milky white in color, and can be used to treat gastrointestinal discomfort caused by gas collecting in the abdomen, as an adjunctive medication prior to imaging examinations, and as an additive to contrast suspensions. To date, no adverse reactions have been observed as a result of taking simethicone emulsion. In addition, simethicone emulsion does not contain sugar, so nutritional disorders and diabetic patients can also use this product. Note: This product is contraindicated in people who are allergic to it, and it is recommended that patients use simethicone emulsion under the supervision of a doctor.