What exactly does 1:1000 mean when speaking of epinephrine 1:1000?

I am asking about the meaning of the units of 1:1000. Does this number represent 1ml: 1000mcg or something else.

Need more information. Sounds to me like a dilution ratio, as in one mole of epinephrine per 1000 moles of solvent. But again, need more info to help you out.
its ratio
i think its just a ratio saying that there is 1 part per 1000
The other way around. 1 unit epi to 1000 units diluent.
In this case, 1 mg per 1 mL.
1:200 is 5 mg/mL concentration.

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