SODIUM CHLORIDE
Clinical safety rating: safe
Animal studies have demonstrated safety
Sodium chloride dissociates in body fluids into sodium and chloride ions, which are major determinants of extracellular fluid osmolality and volume. It maintains electrolyte balance, nerve impulse transmission, and muscle contraction.
| Metabolism | Sodium and chloride ions are not metabolized; they are absorbed and distributed throughout the body, then excreted primarily by the kidneys. Regulation occurs via renal tubular reabsorption and excretion under hormonal control (e.g., aldosterone, ADH). |
| Excretion | Primarily renal (>90%) via glomerular filtration and tubular reabsorption; negligible biliary/fecal elimination (<1%) |
| Half-life | Variable and distribution-dependent; for acute changes, distribution half-life ~20 minutes; terminal half-life ~8-12 hours for total body sodium adjustment, clinically relevant for electrolyte correction |
| Protein binding | Negligible (<1%); not significantly protein-bound |
| Volume of Distribution | Approximately 0.6-0.7 L/kg (total body water); expands with extracellular fluid volume expansion |
| Bioavailability | Oral: 100% (passive absorption, no first-pass metabolism); intravenous: 100% |
| Onset of Action | Intravenous: immediate (within seconds) for plasma volume expansion; oral: within 30-60 minutes |
| Duration of Action | Intravenous: duration of effect depends on dose and renal function, typically 30-60 minutes for plasma volume; oral: prolonged effect as long as intake continues |
| Action Class | Crystalloids |
Intravenous: 0.9% sodium chloride (normal saline) infusion at 50-100 mL/hour for maintenance; dose depends on indication (e.g., 500-1000 mL bolus for hypovolemia). Maximum rate: 1 L/hour in emergencies.
| Dosage form | INJECTABLE |
| Renal impairment | No dose adjustment required; use with caution in severe renal impairment due to fluid overload risk. |
| Liver impairment | No dose adjustment required; monitor for fluid overload in cirrhosis with ascites. |
| Pediatric use | Intravenous: Maintenance 100-120 mL/kg/day for first 10 kg, plus 50 mL/kg/day for next 10 kg, plus 20 mL/kg/day for each kg above 20; bolus 10-20 mL/kg over 30-60 minutes for hypovolemia. |
| Geriatric use | Use lower infusion rates (e.g., 25-50 mL/hour maintenance) and monitor for fluid overload; adjust based on renal function and cardiovascular status. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
No significant drug interactions Can cause hypernatremia and fluid overload.
| Breastfeeding | Sodium chloride is a normal component of breast milk. No adverse effects expected at therapeutic doses. M/P ratio not applicable as it is an endogenous substance. Compatible with breastfeeding. |
| Teratogenic Risk | Sodium chloride is an essential electrolyte and not teratogenic at physiological doses. No fetal risks identified in trimester 1, 2, or 3 when used appropriately. Excessive doses may cause maternal electrolyte imbalance, potentially affecting fetal homeostasis. |
| Fetal Monitoring |
■ FDA Black Box Warning
No FDA black box warning for sodium chloride.
| Serious Effects |
["Hypernatremia or hyperchloremia","Fluid overload (e.g., pulmonary edema, severe congestive heart failure)","Severe renal impairment with oliguria or anuria (unless dialysis is being performed)","Patients with elevated lactate levels (e.g., lactic acidosis) when used as a large volume resuscitation fluid (due to risk of hyperchloremic acidosis)"]
| Precautions | ["Use with caution in patients with heart failure, renal impairment, cirrhosis with ascites, or edema (risk of fluid overload)","Monitor serum electrolytes, fluid balance, and renal function during prolonged therapy","Avoid rapid infusion of large volumes, especially in patients with compromised cardiovascular or renal function","Use with caution in patients with hypertension (sodium load may increase blood pressure)","Do not use solutions containing preservatives for irrigation of certain tissues (e.g., ophthalmic use)","Risk of hypernatremia and hyperchloremia with excessive administration"] |
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| Monitor serum sodium, chloride, and osmolality in pregnant women receiving intravenous sodium chloride, especially if high volumes or concentrations are used. Assess for signs of fluid overload (edema, hypertension) and electrolyte disturbances. Fetal assessment includes monitoring for maternal hypernatremia or hyponatremia which can affect fetal fluid balance. |
| Fertility Effects | No known adverse effects on fertility. Sodium chloride is essential for normal reproductive function. No evidence of impaired fertility at physiological doses. |