<unk>  (INN) is a serotonin 5-HT3 receptor antagonist used mainly to treat nausea and vomiting following chemotherapy, although it has been used experimentally as an analgesic in cases of fibromyalgia. The drug is available in a 5 mg oral preparation or in 2 mg intravenous form. It is marketed by Novartis in Europe, Australia and New Zealand as Navoban, but is not available in the U.S.
Tropisetron
Lerisetron
Granisetron 
Alosetron
Cilansetron
Ramosetron
Dolastetron 
Palonosetron