How long the interval between two infusions depends mainly on the type of antibiotic infused and its own metabolic characteristics, or varies according to the half-life. In clinical practice, the interval between antibiotic infusions can be 4 hours, 6 hours, 8 hours, 12 hours or even 24 hours, mainly because the half-life of each antibiotic is different, and the main purpose of such a long interval is to maintain the effective blood concentration in the body, so as to achieve the therapeutic effect. So the time between two infusions or two infusions of antibiotics varies mainly according to the half-life of the infused drug.