“…So, preventing CINV during chemotherapy is important and 5-HT3 receptor antagonists are (5-HT3-RA) widely used as antiemetics in clinical (Claudio Faria et al, 2014). But one side effect of the 5-HT3 receptor antagonists is constipation, because the 5-HT3 receptor antagonists (5-HT3-RA) prevent the gastrointestinal peristalsis, at the same time (Botrel et al, 2011;Faria et al, 2013). The 5-HT3 receptors antagonists affect GI vagal afferents to inhibit the vomiting reflex, gastric distension and delaye gastric emptying (Andrews et al, 1988;Yoshioka et al, 1990;Horn et al, 2004;Badary et al, 2006).…”