The medication administration that I consider the fastest and most effective to relieve pain is Oral medication administration.

Technically that's not correct because oral medicine is slowest of the three. Intravenous is fastest followed by intramuscular.

I prefer intramuscular ways to administer injections into my body which my bloodstream can easily absorb

I also prefer intramuscular route because it seems less painful than intravenous because later requires more precision and sometimes misplacement of needle in vein leads to issues like multiple procks etc

In this case of intramuscular way of receiving an injection is simply a technique that is used to administer medication right into the muscles of a patient which allows blood to absorb the medication.

That's correct .

Good luck .