Arazasetron is an antiemetic which acts as a 5-HT3 receptor antagonist, pKi = 9.27. It is used in the management of nausea and vomiting induced by cancer chemotherapy (such as cisplatin chemotherapy). Azasetron hydrochloride is given in a usual dose of 10 mg once daily by mouth or intravenously. It is approved for marketing in Japan, and marketed exclusively by Torii Pharmaceutical Co., Ltd. under the trade names "Serotone I.V. Injection 10 mg" and "Serotone Tablets 10 mg".

Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months.
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20°C. Generally, these will be useable for up to one month. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.