Neuropozyne

Neuropozyne, informally called Nu-poz, is an anti-rejection drug used by mechanically-augmented humans to stop the build up of glial tissue around augmentations.

Background
As mechanical augmentations are placed over raw human tissue, such as the stub of a limb or an empty eye socket, the body will attempt to stop the bleeding around the open area, creating scar tissue that solidifies in mechanical augmentations, damaging them.

Neuropozyne is some form of local anticoagulant that keeps the augmentations free of scar tissue. It is required at least weekly for the average human, and although it is not produced with especially rare materials, its distribution is heavily monitored and it can sell for extraordinary prices on the secondhand market.