Overview Study of PHN131 in Patients After Surgery Status: Completed Trial end date: 2019-02-13 Target enrollment: Participant gender: Summary The purpose of this study is to assess the effectiveness, safety and pharmacokinetics of Oral Nalbuphine in the treatment of postoperative pain following hemorrhoidectomy. Phase: Phase 2/Phase 3 Details Lead Sponsor: PhytoHealth CorporationTreatments: Nalbuphine