Onset Tablets 8mg – Prevents Post-Operative Nausea and VomitingOnset Tablets 8mg Prevent Post Operative Nausea and Vomiting (PONV) Onset Tablets 8mg, containing the active ingredient Ondansetron, are used to effectively prevent post operative nausea and vomiting (PONV). This medication is also indicated for the treatment of chemotherapy induced nausea and vomiting (CINV) in children aged 6 months and older. Onset is part of a class of medications called antiemetics, which help control nausea and vomiting,