Navoban is a medication used to prevent nausea and vomiting caused by chemotherapy. It works by blocking receptors that stimulate the vomiting center in the brain, thus blocking the signals that cause nausea. It is given intravenously shortly before the start of treatment to ensure maximum effectiveness. Navoban may help reduce symptoms that last for hours after the session. It should be used under the supervision of a specialist to avoid any unwanted side effects, such as headache or constipation. It is also recommended to monitor the patient's condition if he or she suffers from heart or liver problems.