In these protocols, magnesium sulfate is prepared/diluted in which solution?

• A. Dextrose water
• B. Lactated Ringer's
• C. Normal saline (NS)
• D. 0.9% saline with dextrose

Answer: (C)

When preparing magnesium sulfate for IV use, the diluent should be a compatible, isotonic solution to protect the IV site and keep the drug stable. Normal saline (0.9% NaCl) fits this role well. It is isotonic with blood, has no sugars or calcium, and is widely used as the standard diluent for many IV medications, including magnesium sulfate. This helps avoid shifts in fluid balance and potential chemical interactions that can occur with other diluents.

Dextrose-containing solutions introduce glucose, which isn’t needed for this medication and can complicate patient blood sugar management; they’re generally avoided for diluting magnesium sulfate. Lactated Ringer’s contains calcium and lactate, which can interact with magnesium and raise the risk of precipitation or imbalance, so it’s not used. A solution with dextrose plus saline also adds glucose, bringing similar compatibility concerns.

So, the chosen diluent is plain normal saline, ensuring compatibility and predictable administration.