[Why is peroperative antibiotic prophylaxis of infectious complications most effective?]

The concentrations of oxacillin, azlocillin, temocillin, amoxycillin, cefoperazone, cefazoline, netilmicin, clindamicin, ofloxacine in serum and coagulum take a parallel course but their content in the coagulum is ten times lower than in serum--with the exception of doxycycline which reached a 40% value of the serum level in the coagulum. From this ensues that most effective are those antibiotics which can be administered in large doses and which have a long half-life. Unfavourable are antibiotics with a narrow therapeutic range and those with a short half-life. Preoperative application of such doses which create sufficiently high and prolonged levels is the optimal method of antibiotic prophylaxis of infectious complications during surgical operations.