Many procedures are performed on an outpatient basis. The patients are examined one or more days before surgery, and laboratory diagnosis (Preoperative evaluation). Preparation In general, patients orally take 24 hours before the operation nothing more to it. Some interventions on the gastrointestinal tract enemas or orally fed solutions must be given 1-2 days in advance. Any necessary antibiotic prophylaxis must be started one hour before the cut. Precautions at discharge Before discharge should pain and be able to think clearly, the patients free to breathe normally, to drink, to go and urinate. If sedatives such. As opioids or benzodiazepines, are used in the outpatient surgery, patients should leave the hospital only in the company. Even if the anesthesia is apparently subsided, the patients are still affected (even if they feel good) and have discrete residual effects that can not be driving a car would advocate; in many patients opioids are used for pain. Elderly patients may temporarily disoriented because of the combined effects of the anesthesia and surgical stress and can cause drug reactions develop urinary retention by immobility and anticholinergics.