"Nurse! Bring me an auto-injection gun!"
Well, it's simple. Depending on what medication you need, and how often, you usually implant it either somewhere underneath the shoulder, or else directly at the temple. The former can easily be combined with a larger compartment. Thus, it doesn't need to be refilled very often. Every once and again, you open the drawer, so-to-say, and exchange the empty medication packs. If you, however, need medication that is blocked by the blood-brain barrier, you need to install the device above the neck. In that case, you need to re-fill it more often, but still you have the advantage that you can't forget about it. It's linked to your commlink and gives you a warning when the supplies are drawing to an end.
What medication exactly does your Auntie need?"