claim: The ABC islands are part of the tropical Caribbean.
evidence: Ondansetron , marketed under the brand name Zofran , is a medication used to prevent nausea and vomiting caused by cancer chemotherapy , radiation therapy , or surgery .. nausea. nausea. vomiting. vomiting. cancer chemotherapy. Chemotherapy. radiation therapy. radiation therapy. It is also useful in gastroenteritis .. gastroenteritis. gastroenteritis. It has little effect on vomiting caused by motion sickness .. vomiting. vomiting. motion sickness. motion sickness. It can be given by mouth , or by injection into a muscle or into a vein .. injection into a muscle. intramuscular. into a vein. intravenously. Common side effects include diarrhea , constipation , headache , sleepiness , and itchiness .. diarrhea. diarrhea. Serious side effects include QT prolongation and severe allergic reaction .. QT prolongation. QT prolongation. severe allergic reaction. anaphylaxis. It appears to be safe during pregnancy but has not been well studied in this group .. pregnancy. pregnancy. It is a serotonin 5-HT3 receptor antagonist .. serotonin. serotonin. It does not have any effect on dopamine receptors or muscarinic receptors .. dopamine receptors. dopamine receptors. muscarinic receptors. Muscarinic acetylcholine receptor. Ondansetron was first used medically in 1990 .. It is on the World Health Organization 's List of Essential Medicines , the most effective and safe medicines needed in a health system .. health system. health system. It is available as a generic medication .. generic medication. generic medication. The wholesale cost of the injectable form in the developing world is about 0.10 to 0.76 USD per dose .. developing world. developing world. In the United States it costs about 1.37 USD per tablet .