Vancomycin May Trigger Dangerously Low Platelet Count:

The antibiotic vancomycin often used in intensive care units is considered the drug of choice for the treatment of staphylococci (staph) infections that are resistant to most other antibiotics. Researchers at the Medical College of Wisconsin in Milwaukee and the BloodCenter of Wisconsin's Blood Research Institute have linked vancomycin to an abnormal decrease in blood platelet count, a condition called thrombocytopenia. If accompanied by uncontrollable bleeding, thrombocytopenia can be fatal.
The real lessons, though, will be learning more about how drugs such as vancomycin trigger the production of antibodies that destroy red and white blood cells in addition to platelets. We also hope to find out how the drugs cause this type of antibody to bind to blood cells and cause their destruction. A longer-term goal is to develop ways to identify environmental and genetic factors that predispose individuals to experience this type of drug hypersensitivity reaction," says Dr. Aster.