For chemotherapy induced vomiting, 5HT3 antagonist having maximum potency is:
it is the longest acting and highest affinity towards 5HT3 receptor used in chemotherapy induced vomiting ESSENTIAL OF MEDICAL PHARMACOLOGY SEVENTH EDITION KD TRIPATHI PG NO .669
Ondansetron
Granisetron
Dolasetron
Palonosetron
Gastrointestinal tract