After simple gastroscopy and gastroscopy combined with small therapeutic operations, you can drink purgative medication, while after larger therapeutic operations, you should abstain from food and drink, and gradually transition to food and drink.
Gastroscopy can be a simple examination of the upper gastrointestinal tract or a therapeutic operation, such as resection of gastric polyps, and fasting is required after resection of larger polyps because of the large trauma.
If only simple gastroscopy, the examination is completed after 1 to 2 hours can eat, including drinking bowel cleansing drugs; if the therapeutic operation, small trauma can be operated after 1 to 2 hours after taking medication, and for the operation of large trauma need to be fasting, it is necessary to gradually transition to diet, can not take bowel cleansing drugs, if necessary, can be enemas.
Specific medication and diet should be under the guidance of the specialist.