• Aloxi is a clear colourless solution for injection into a vein. • The active ingredient (palonosetron) belongs to a group of medicines known as serotonin (5HT3) antagonists. • These have the ability to block the action of the chemical, serotonin, which can cause nausea and vomiting. • Aloxi is used for the prevention of nausea and vomiting associated with cancer chemotherapy.