Magnesium Chloride / Potassium Chloride / Sodium Acetate / Sodium Chloride / Sodium Gluconate

This electrolyte combination appears in several products used in clinical settings to restore fluids and minerals or for irrigation purposes.

• Normosol-R (intravenous): Replaces acute extracellular fluid losses due to surgery, trauma, burns, or shock; also used to restore blood volume after moderate blood loss, and as a priming solution or diluent for blood transfusions
• Plasma-Lyte A (intravenous): Provides water and electrolytes, and acts as an alkalinizing agent to help reduce excess acid in the blood
• Multiple Electrolytes pH 7.4 (intravenous): Source of water and electrolytes, and an alkalinizing agent
• Multiple Electrolytes pH 5.5 (intravenous): Source of water and electrolytes, and an alkalinizing agent
• Isolyte S (intravenous): Source of electrolytes and water for hydration and an alkalinizing agent, approved for both adults and pediatric patients
• Physiolyte (irrigation): Used for general irrigation, washing, and rinsing — not for intravenous infusion

Each electrolyte in this solution plays a specific role in keeping the body's chemistry in balance. Sodium manages fluid distribution and is the main mineral in the fluid that surrounds your cells. Potassium is the main mineral inside cells and is critical for nerve and muscle function. Magnesium supports hundreds of enzyme reactions and helps control nerve and muscle activity. Acetate is converted by the liver into bicarbonate, which helps neutralize excess acid in the blood — a useful effect even when the liver is under stress. Gluconate helps balance the electrical charge of the solution. Together, these electrolytes mirror the natural composition of blood plasma, helping restore a stable internal environment after fluid or blood loss.

These solutions are always administered in a clinical setting — never at home. The intravenous forms are infused directly into a vein; the rate, volume, and duration are determined by your care team based on your age, weight, and medical condition.

• Normosol-R may also be given subcutaneously (under the skin) in some cases
• Physiolyte is applied as an irrigation solution to body surfaces or cavities — the amount used depends on the area being treated
• Dosing for all products should be directed by a physician, with frequent lab monitoring during prolonged use

Like any IV fluid, these solutions can cause side effects — most often related to how they're given or to shifts in electrolyte levels.

• Fever during infusion
• Redness, infection, or pain at the injection site
• Vein inflammation (phlebitis) near the IV site
• Fluid leaking out of the vein (extravasation)
• Swelling from excess fluid (hypervolemia)
• Nausea, vomiting, stomach pain, or diarrhea
• Flushing or sweating (with elevated magnesium levels)
• Tingling, muscle weakness, or low blood pressure if electrolytes become imbalanced

Serious reactions — including heart rhythm problems, breathing difficulty, seizures, or signs of an allergic reaction — require immediate medical attention.

• Fluid overload: Too much fluid given too fast can cause dangerous buildup in the lungs or throughout the body, especially in patients with heart or kidney problems.
• Low sodium (hyponatremia): Can cause headache, nausea, seizures, and serious brain injury — risk is higher in patients with heart or lung failure, or certain hormonal conditions.
• High sodium (hypernatremia): Can cause swelling and worsen heart failure — risk is higher with certain medications like corticosteroids.
• High potassium (hyperkalemia): Can lead to dangerous heart rhythms — risk is greatest in patients with severe kidney impairment, burns, or heart failure.
• High magnesium (hypermagnesemia): Can cause low blood pressure, breathing problems, and collapse — avoid in patients with severe kidney disease or those already on magnesium therapy.
• Metabolic alkalosis (too much base in the blood): Can occur if too much solution is given; these products are not for treating already-existing severe alkalosis or severe lactic acidosis.
• Low calcium (hypocalcemia): The alkalinizing effect can lower active (ionized) calcium — avoid in patients who already have low calcium.

Several types of medications can interact with these electrolyte solutions and require monitoring or avoidance.

• Corticosteroids or corticotropin: Increase the risk of sodium and fluid retention, potentially causing high sodium levels and swelling
• Diuretics (water pills), certain antiepileptic drugs, and certain psychiatric medications: Can increase the risk of dangerously low sodium levels
• Potassium-sparing diuretics, ACE inhibitors, ARBs, tacrolimus, cyclosporine: Can raise potassium to dangerous levels when combined with these potassium-containing solutions
• Lithium: These solutions may speed up the kidneys' removal of lithium, potentially changing lithium levels in the blood
• Drugs with pH-dependent kidney clearance: The alkalinizing effect may cause the kidneys to clear acidic drugs faster and alkaline drugs more slowly, potentially changing how well those drugs work

This is not a complete list of interactions. Always talk with your doctor or pharmacist before starting, stopping, or changing any medication.

• Tell your care team if you have kidney disease — reduced kidney function increases the risk of high sodium, potassium, and magnesium levels
• Tell your care team if you have heart failure, liver disease (including cirrhosis), high blood pressure, or pre-eclampsia — you may be at greater risk for fluid overload and high sodium
• Tell your care team if you have low calcium levels (hypocalcemia) — these solutions can further reduce active calcium in the blood
• Tell your care team if you have high potassium levels or extensive burn or tissue injuries
• Tell your care team if you are already receiving magnesium therapy (for example, for eclampsia or myasthenia gravis)
• Tell your care team about all medications you are taking, especially corticosteroids, diuretics, ACE inhibitors, ARBs, lithium, tacrolimus, or cyclosporine
• Patients with SIADH (a hormonal condition causing low sodium) or who are already overhydrated should use these solutions with extra caution
• Known allergy or hypersensitivity to any ingredient is a contraindication for Plasma-Lyte A — inform your care team of any prior reactions to IV fluids

Too much of these solutions can cause fluid buildup throughout the body, including in the lungs, and can dangerously raise sodium, potassium, and magnesium levels — especially in patients with kidney problems. Excess administration can also cause metabolic alkalosis (too much base in the blood) along with drops in active calcium and magnesium. If an overdose is suspected, the infusion should be stopped and the care team will assess fluid balance, electrolyte levels, and acid-base status and treat as needed.

These solutions closely mirror the electrolyte composition of normal blood plasma. When infused, they expand the volume of fluid outside cells (the extracellular fluid), helping restore circulation and blood pressure after fluid or blood loss. The acetate component is metabolized to bicarbonate, producing a mild acid-neutralizing (antiacidotic) effect that can help correct mild acid buildup. The solution's overall osmolarity (approximately 280 mOsmol/liter) is designed to match that of normal body fluids, reducing the risk of cell damage from solutions that are too concentrated or too dilute.

Sodium and chloride are distributed throughout the extracellular fluid and are primarily excreted by the kidneys, which tightly regulate their balance. Potassium is the main mineral inside cells; about 80–90% of potassium taken in is excreted in the urine, with small amounts lost in stool and sweat. The kidneys do not conserve potassium well, so losses continue even during fasting. Magnesium is excreted solely by the kidneys at a rate proportional to its concentration in the blood and the kidney's filtration rate. Acetate is rapidly converted to bicarbonate in the liver — this process occurs even when the liver is significantly impaired.

Avoid excessive heat. Protect from freezing. Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C to 30°C (59°F to 86°F).