Serum levels of magnesium sulfate are of dubious value, since infusions rarely go longer than 2 days. Magnesium toxicity may be signaled by excessive drowsiness and absence of patellar reflexes. Continue magnesium sulfate therapy at least 24 hours post partum. Watch for postpartum hemorrhage because magnesium sulfate can relax the uterus. However, the efficacy of aspirin for this indication has been called into question.
Several studies show that aspirin makes no difference in maternal or fetal outcomes.
A recent meta-analysis indicates that calcium supplementation during pregnancy may reduce the risk of preeclampsia and hypertension during pregnancy. These results will need to be confirmed. However calcium supplementation is innocuous and should be considered. Chronic Hypertension Risks. If no superimposed preeclampsia occurs, there is no additional maternal risk.