Most IV bags are clear. A quick search for IV bags of milky white liquids turns up "lipid emulsion". Apparently it's used to provide nutrition to patients who cannot consume food normally (wide range of reasons), as well as to counter various drug overdoses.
https://canadiem.org/iv-lipid-emulsion-for-drug-toxicity-in-the-ed/
http://www.lipidrescue.org/
We shouldn't read so much into this as to start shouting about children being rescued from D.U.M.Bs.