5-Fluorouracil (5-FU) is a chemotherapy drug that inhibits fibrosis. It is used to modify the scar tissue that is forming in the lower eyelid and can help. I would keep the expectations down however. Part of the retraction is due to motor nerve injury that occurs with this lower eyelid surgery. You are less than 3 weeks out. Generally, we recommend conservative management for the first 4 months. At that point, reconstruction of the lower eyelid position can be considered if the eyelid is still unsatisfactory. That decision should be based on aesthetics and functional considerations like drying. After healing for this period of time, you might find that the lower eyelid retraction is relatively minor and not worth the effort to revise the eyelid.