what are the signs and symptoms of vancomycin toxicity?
['bitter taste.', 'reddish rash on face and upper body (intravenously: red neck or red man syndrome, related to infusion rate)', 'low blood pressure accompanied by flushing.', 'nausea.', 'vomiting.', 'chills.', 'drug fever.', 'high levels of white blood cells (eosinophilia)']