Whether or not you can drink water after drinking dimethicone is related to the examination performed by the patient. If it is gastroenteroscopy, you can drink water; if it is gastrointestinal gas-barium double-contrast examination, you must not drink water, so as not to affect the results of the examination. 1. Gastroenteroscopy: Dimethylsilicone oil is usually used as an adjunctive medication for gastroenteroscopy, which can empty the foam caused by laxatives. Drinking water after drinking dimethicone before gastroenteroscopy can make dimethicone work better, so you can drink water when taking dimethicone during gastroenteroscopy. 2. Gastrointestinal gas-barium double contrast contrast examination: the examination requires patients to take gas-producing powder, and then take the suspension of dimethylsiloxane oil and barium sulfate, drinking water at this time will dilute the suspension, thus affecting the results of the test, so the gastrointestinal gas-barium double contrast examination of taking dimethylsiloxane oil can not drink water. It is recommended that the examinee consults the specialist in time if there is any doubt about the use of the drug.