q8h is more commonly used in long-term medical advice, which means once every eight hours, and can be used in oral administration, intravenous drip administration, or in nursing care orders, meaning every eight hours. Some common antibiotics, such as cefoxitin, are required by the pharmacopoeia to be given at least every eight hours or every six hours, because the half-life of cefoxitin is relatively short, and only when given once every eight hours can it reach an effective blood concentration that is lethal to the bacteria in the body. The same is true for oral administration. If there are some drugs that require once every eight hours, the q8h should be stated at the end of the long-term medical advice.