Magnesium preparations can be very confusing as the concentration can be stated as mg, mmols or percentage and you need to be able to convert between them.
Give 50% solutions only IM. Dilute to 20% for IV injections.
1 g Magnesium is approx equivalent to 4 mmol Mg (2+) or 8 mEq.
| Mg % w/v | Mg mmols/ml | Mg mg/ml | Examples of preparations |
|---|---|---|---|
|
10% w/v |
0.4 mmol/ml |
100 mg/ml |
1 g in 10 ml |
|
20% w/v |
0.8 mmol/ml |
200 mg/ml |
4 g in 20 ml |
|
50% w/v |
2.0 mmol/ml |
500 mg/ml |
1 g in 2 ml |