We investigated post-operative management of acute complications of percutaneous endoscopic gastrostomy (PEG) which often caused respiratory infections and local skin infections. The subjects were a total of 341 patients (male 131, female 210, and the mean age was 80.3), they were classified into six groups by method of feeding and use of antibiotics. Patients were divided into three groups based on the time that feeding was started. In Group I, enteral feeding was not started within the first five days. In Group II, sterilized enteral feeding (lactated Ringer's solution for intravenous infusion) using sterilized intravenous infusion kit started within 24 hours after the procedure, and in Group III, feeding of the usual enteral formula started within 24 hours after the procedure. And as for the using of antibiotics, they were also divided into two groups, antibiotics administered[AB (+)] and no antibiotics administered[AB (-)]. Thus, the patients were divided into six groups according to the time of starting nutrition and the use of antibiotics. The rates of incidence of acute respiratory infections and local skin infections in the six groups were compared by the chi-square test and differences in the rates of incidence of complication were also compared between two PEG methods; the Pull/Push method and the Introducer method. The frequency of local skin infection in Group III was significantly higher than in Group I and Group II. As for the PEG methods, the frequency of local skin infection in the Pull/Push method was significantly higher than Introducer methods. Acute respiratory infections occurred significantly less in the AB (+) group than in the AB (-) group. Postoperative administration of antibiotics would seem to be appropriate for prophylaxis of respiratory infection in elderly patients after PEG. On the other hand, local skin infections are not related to administration of antibiotics, and are highly related to the method of feeding. We concluded that nutrition of sterilized enteral feeding immediately after operation using a sterilized intravenous infusion kit and administration of antibiotics are advisable to prevent major complications in elderly patients.