Magnesium sulfate comes in conc. 50% w/v which means 50gms in 100ml of solvent. So 2ml of 50% w/v solution will contain 1gm of mag. sulfate. So if i have to administer 5gm of mag. sulf. I'l have to inject 10ml of 50% w/v mag. sulf.
It's suggested dosing for hypomagnesemia is 5gm of mg sulf in 1litre of ns/d5w to be infused over 3hrs
So for practical purpose 2ampoules can be mixed in 1bottle(500 ml) NS which can be infused over 1.5 to 2hrs.
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