The concentration of the infusion is 1444.
Intravenous infusion administration of fluids into the vein by means of a steel needle or plastic catheter.
Since, we have concentration of a drug as 325mg/225ml.Means that in  225ml amount of drug involved is 325mg
=>In 225ml amount of drug is=325mg
=>In 1 ml amount of drug is=(325/225)mg=1.44mg
Now, we have amount of drug in 1ml,but we have asked to give concentration in mcg.
We know that 1mg = 1000mcg.
Therefore, 1.44mg =1.44×1000mcg=1444.44mcg.
Hence, we can conclude that  the concentration of the infusion on a mcg/ml basis is 1444.
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