This has to do with how the medicine is adsorbed by the body and how fast the medicine is elminated from the body.
Medicines have specifc “routes” in the body to end up where the medicine needs to be. Skipping a step by implanting it, means the medicine doesn’t work or does something completely else in the body.
Not every medicine that can be injected in the bloodstream can be “transformed” into a pill that has the same effect.
The second reason is elimination, if the half time of the medicine (time the concentration of the medicine is halved in the body) is 4 days. You only need to take the medicine every couple of days to stay in the “therapeutic window”(between these two concentrations the medicine has an effect and the effect is not toxic to the body).Therefore an implant in that case would be strange.
However a medicine with a half time of 1 hour makes more sense to have as an implant.
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