What is the adjective for dose?

Answer 1

dot.

There is not automatically an adjectival form for any and every noun.

If "dose" is to be an adjective, there has to be a noun that it describes - as in, conceptually, "this {object} is <dose>, dude!".

The only thing I can think of, offhand, is "dosage meter" - a measuring device that measures, particularly, dosage. Conversely, arguably, "dosage" is a different word.

In English, failing there being a real word at all, you can make a (dodgy) adjective by adding the suffix "-wise". (E.g. "clockwise" - "in the direction like how a clock goes".) Thus, for instance: "Dose-wise, I think that is okay. However, I am not sure that the treatment is the right one in the first place."