Question: how many grams of magnesium sulfate?
Answer: Maximum daily dose is 30 to 40 g. Or, 8 to 15 g depending on weight of patient (8 g for 45-kg [100-lb] patient and 15 g for 90-kg [198-lb] patient); 4 g of magnesium sulfate (as magnesium sulfate injection or magnesium sulfate in D5W) is given I.V. and the remaining dose is given I.M.