<prompt> The receptor involved in chemotheraphy induced vomiting is:Histamine H1 receptorSerotonin 5-HT3 receptorDopamine D2 receptorOpioid m receptor  <response>: Ondansetron:- It is the prototype of the new class of selective 5-HT3 antagonists that have shown efficacy in controlling nausea and vomiting following administration of highly emetic anticancer drugs and radiotherapy. Ref:- kd tripathi; pg num:-175 Ondansetron is the DOC for early vomiting and nausea due to chemotheraphy and radiotherapy. 