Cilansetron is a drug that is a 5HT-3 antagonist currently under trial phase in the EU and US. It is manufactured by Solvay Pharmaceuticals INC. [Wikipedia] (en)
Cilansetron is a potent and selective 5-HT<sub>3</sub> receptor antagonist. 5-HT<sub>3</sub> receptors are nonselective cation channels that are extensively distributed on enteric neurons in the human gastrointestinal tract, as well as other peripheral and central locations. Activation of these channels and the resulting neuronal depolarization affect the regulation of visceral pain, colonic transit and gastrointestinal secretions, processes that relate to the pathophysiology of irritable bowel syndrome (IBS). 5-HT<sub>3</sub> receptor antagonists such as cilansetron inhibit activation of non-selective cation channels which results in the modulation of the enteric nervous system. (en)