Tolansetron Injection is generically known as Tolansetron Hydrochloride Injection, with an instructed dosage of 0.1mg/kg for children over 2 years of age up to a maximum of 5mg/day; the recommended dose for adults is 5mg/day once a day for a 6-day course of treatment. The specific dosage should be followed by the doctor’s advice. Tolansetron hydrochloride injection is a highly selective and potent competitive inhibitor of central nervous system and peripheral neuronal 5-hydroxytryptamine 3 receptors, which inhibits the gag reflex. The drug is used clinically for the prevention and treatment of vomiting and nausea induced by cancer chemotherapy, and also for the treatment of nausea and vomiting after surgical procedures. It is contraindicated in people who are allergic to any of the components of the drug and in pregnant women. Some patients may experience adverse reactions such as constipation, headache, dizziness, vertigo, abdominal pain, diarrhea, fatigue, etc. during the use of the drug, if the discomfort is more serious, the doctor should be informed in time and treated accordingly. Tolansetron hydrochloride injection should be used by professional doctors, patients should not self-medication, so as not to affect the condition.