Final answer:
Zofran is the most effective antiemetic for chemotherapy induced nausea & vomiting and it is also the most expensive.
Step-by-step explanation:
The most effective antiemetic for chemotherapy induced nausea & vomiting is Zofran, which contains the active ingredient ondansetron. Zofran works by blocking serotonin receptors in the brain, helping to reduce nausea and vomiting. It is often prescribed to cancer patients undergoing chemotherapy.
However, Zofran is also the most expensive antiemetic medication. Due to its effectiveness and cost, it is commonly used for treating severe cases of chemotherapy-induced nausea & vomiting.