Dosage
Etymology
From "dose," which comes through French from Latin "dosis," itself from Greek "dosis" (a giving), from "didonai" (to give). A dose is literally "a giving" of medicine; the suffix "-age" turns it into the overall system of giving.
noun · /DOH-sij/
The amount and schedule in which a medicine is to be taken.
What it names
Reach for it when you mean the regimen — how much, how often, how long — not just a single measured amount.
Example
The pills were the same, but the new dosage spread them across three smaller doses a day.
Related idea
A dose is one specific amount taken at one time; the dosage is the whole prescribed pattern of doses. The old toxicology maxim "the dose makes the poison" turns on the single amount — even water can harm at a high enough dose.