This clinical trial is studying a drug called PF614, which is a type of pain medicine similar to oxycodone, but it releases slowly in your body over time. It is for people who will have abdominoplasty surgery, which is a surgery to remove extra skin and fat from the tummy area. The study wants to see if PF614 helps with pain better than a placebo (a pill with no medicine). Participants will take the study drug starting just before surgery and then every 12 hours for up to 4 days. They will stay at the clinic for 5 days to be watched for safety and how the drug works. After leaving, they will keep a diary about their pain and any side effects for a few more days.

• The study lasts about 9 days in total, including staying at the clinic for 5 days.
• Participants must take medicine and rate their pain regularly.
• Potential side effects and rescue medication needs will be monitored closely.