“…More recently, cyclizine (H 1 receptor antagonist) proved to be at least as effective as ondansetron in preventing PONV after gynaecological laparoscopy and was even superior to ondansetron concerning the use of rescue antiemetics in patients undergoing diagnostic laparoscopy [18]. A recently published study investigating changes in the mediator levels of histamine and serotonin metabolites after gynaecological laparoscopy demonstrate an association between these changes in mediator levels and PONV [19,20]. In accordance with these results, a recently published metaanalysis showed that dimenhydrinate, another H 1 antagonist with some antimuscarinic activity, has a similar efficacy with respect to the prophylaxis of PONV when compared to more common antiemetics such as 5HT 3 antagonists and droperidol [2,21].…”