Granisetron is a serotonin 5-HT3 receptor antagonist used to treat nausea and vomiting following chemotherapy. Its main affect is to reduce the activity of the vagus nerve, which is a nerve that activates the vomiting center in the medulla oblongata. It does not have much effect on vomiting due to motion sickness. This drug does not have any effect on dopamine receptors or muscarinic receptors.
Granisetron was developed by chemists working at the British drug company Beecham around 1988 and is expected to go generic in 2007/2008. It is produced by Roche Laboratories under the trade name Kytril®. The drug was approved in the United Kingdom in 1991 and in United States in 1994 by the FDA.
Granisetron breaks down slowly, staying in the body for a long time. One dose usually lasts 4 to 9 hours and is usually administered once or twice daily. This drug is removed from the body by the liver and kidneys.
More on [ Granisetron ]

Granisetron - Familydoctor.org - Information for patients in English and Spanish.
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