ATI CBC Level 3 Practice Test

Magnesium sulfate is used to prevent seizures in preeclampsia because it raises the seizure threshold and provides neuroprotection against eclamptic events. It helps stabilize nerve cell membranes and dampens central nervous system excitability, which lowers the risk of seizures in a high-risk pregnancy. The other drugs listed are antihypertensives—they help reduce blood pressure but do not prevent seizures. They may be used alongside magnesium sulfate to manage BP, but seizure prevention rests with magnesium sulfate. Monitor for signs of toxicity (like slowed reflexes or respiration) and adjust the dose as needed based on clinical status and renal function.