Normal small-molecule drugs are trivial to reverse-engineer, biologics are trickier but the means of manufacturing them is self-replicating, and Shenzhen is good at reverse-engineering other technologies if we're to believe what we read in the media
I highly doubt the process will be a single drug. I can't imagine any way any compound could remove DNA damage[1] for all cells in your body. Of course, if it did that would be great.
Most likely treatment would be some sort of specialized therapy where your DNA is painstakingly copied (with some process that is somehow better than the biological one) and then all the cells in your body are periodically repaired.
Normal small-molecule drugs are trivial to reverse-engineer, biologics are trickier but the means of manufacturing them is self-replicating, and Shenzhen is good at reverse-engineering other technologies if we're to believe what we read in the media