You can eat oyster sauce seasoning when you take cephalexin because oyster sauce does not contain alcohol. Oyster sauce is a seasoning made by boiling oysters and brine, which is a nutritious and tasty seasoning condiment. Oyster sauce is suitable for patients who are weak and malnourished, and can enhance immunity. Patients who take cephalosporin cannot eat food containing alcohol. In the usual cooking process, like yellow wine, cooking wine and beer will be applied in food, especially in stir-fry, so you must pay attention to avoid eating food containing alcohol after eating cephalosporin. Because cephalosporin will have a disulfiram-like reaction with the alcohol in these foods, which will cause harm to the body and even endanger the life.