t.kulkarni, post #23: Concentration and dose get conflated constantly in this subcategory. Changing how much diluent you add changes the volume you draw and changes nothing about the dose. That is the practical version. The rigorous version is longer and says the same thing.
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On post #60 — agreed on the reasoning, with one qualification.
The four-week step is a trial convention, not a pharmacological constant. It is roughly four half-lives for a week-long half-life, which is the interval at which you are assessing a stable concentration rather than a rising one.
That distinction has done more work for me than anything else in this category.