A comparison of serum magnesium sulfate levels in pregnant women with severe preeclampsia between intravenous and intramuscular magnesium sulfate regimens: a randomized controlled trial.

The frequency of blood samples that achieved therapeutic level was lower in the group of maintenance with intravenous regimen than the intramuscular regimen significantly at 15, 30, 60, 120 and 240 minutes after loading dose. The mean level of serum magnesium sulfate in the intravenous group was significantly lower than intramuscular group. This study supported to choose the maintenance by intramuscular regimen. However, further study is required to analyse the effect of higher level of magnesium sulfate in Thai patients.