Sodium Chloride — Veterinary Vademecum Drug Reference

Dosage & Administration Guidelines

Species	Route	Dose	Frequency	Duration & Clinical Notes
Dog	IV	Isotonic (0.9%): 20-40 mL/kg bolus for shock; maintenance: 40-60 mL/kg/day	Bolus or continuous rate infusion	Duration: As needed based on fluid status Notes: Monitor serum electrolytes and hydration status. Use with caution in patients with cardiac or renal disease.
Cat	IV	Isotonic (0.9%): 10-20 mL/kg bolus for shock; maintenance: 40-60 mL/kg/day	Bolus or continuous rate infusion	Duration: As needed based on fluid status Notes: Cats are prone to fluid overload; use lower rates and monitor closely.
Horse	IV	Isotonic (0.9%): 10-20 L/day for maintenance; hypertonic (7.5%): 2-4 mL/kg over 10-15 minutes for shock	Continuous rate infusion or intermittent bolus	Duration: As needed Notes: Hypertonic saline should be followed by isotonic fluids to maintain expansion.
Cattle	IV	Isotonic (0.9%): 20-40 mL/kg for dehydration; hypertonic (7.5%): 2-5 mL/kg for shock	Bolus or continuous rate infusion	Duration: As needed Notes: Monitor for signs of hypernatremia with hypertonic solutions.
Small Ruminants	IV	Isotonic (0.9%): 20-40 mL/kg for dehydration	Bolus or continuous rate infusion	Duration: As needed Notes: Use caution in animals with compromised cardiac function.
Rabbit	IV/SC	Isotonic (0.9%): 10-20 mL/kg bolus, then 100-150 mL/kg/day	Bolus or continuous rate infusion	Duration: As needed Notes: Rabbits are sensitive to fluid overload; use lower rates.
Bird/Poultry	IV/SC	Isotonic (0.9%): 10-20 mL/kg bolus, then 50-100 mL/kg/day	Bolus or continuous rate infusion	Duration: As needed Notes: Use warm fluids to prevent hypothermia.
Exotic/Other	IV/SC/IO	Isotonic (0.9%): 10-20 mL/kg bolus, then 50-100 mL/kg/day	Bolus or continuous rate infusion	Duration: As needed Notes: Adjust based on species and clinical condition.

Clinical Indications & Species Uses

General Indications

Fluid and electrolyte replacement
Osmotic diuresis (hypertonic solutions)
Topical irrigation

Dog (Canine)

Fluid therapy for dehydration, shock, and electrolyte imbalances
Maintenance fluid therapy when potassium and other electrolytes are not needed
Treatment of hyponatremia and hypochloremia
Vehicle for drug administration
Flushing of wounds and body cavities

Cat (Feline)

Fluid therapy for dehydration, shock, and electrolyte imbalances
Maintenance fluid therapy when potassium and other electrolytes are not needed
Treatment of hyponatremia and hypochloremia
Vehicle for drug administration
Flushing of wounds and body cavities

Horse (Equine)

Fluid therapy for dehydration, shock, and electrolyte imbalances
Treatment of hyponatremia and hypochloremia
Hypertonic saline for rapid plasma volume expansion in shock
Vehicle for drug administration
Flushing of wounds and body cavities

Cattle (Bovine)

Fluid therapy for dehydration, shock, and electrolyte imbalances
Treatment of hyponatremia and hypochloremia
Hypertonic saline for rapid plasma volume expansion in shock
Vehicle for drug administration
Flushing of wounds and body cavities

Small Ruminants (Sheep / Goat)

Fluid therapy for dehydration, shock, and electrolyte imbalances
Treatment of hyponatremia and hypochloremia
Vehicle for drug administration
Flushing of wounds and body cavities

Rabbit & Small Mammals

Fluid therapy for dehydration, shock, and electrolyte imbalances
Treatment of hyponatremia and hypochloremia
Vehicle for drug administration
Flushing of wounds and body cavities

Avian & Poultry

Fluid therapy for dehydration and electrolyte imbalances
Vehicle for drug administration
Flushing of wounds and body cavities

Exotic & Other Species

Fluid therapy for dehydration and electrolyte imbalances in reptiles, small mammals, and other exotic species
Vehicle for drug administration
Flushing of wounds and body cavities

Pharmacology & Mechanism of Action

Drug Class: Electrolyte Replacement | Pharmacological Group: Crystalloid Fluid

Mechanism of Action: Sodium chloride is the primary extracellular cation and anion, respectively. It maintains osmotic pressure, fluid balance, and acid-base equilibrium. Sodium is essential for nerve impulse transmission, muscle contraction, and various enzymatic reactions. Chloride is a major anion that helps maintain serum osmolality and is involved in gastric acid production and chloride-bicarbonate exchange. When administered intravenously, it expands the extracellular fluid volume and can correct hyponatremia and hypochloremia.

Pharmacodynamics: Sodium chloride solutions are used to restore fluid balance and electrolyte deficits. Isotonic (0.9%) sodium chloride is used for fluid replacement, while hypertonic solutions (3%, 7.5%) draw fluid from the intracellular space into the extracellular space, rapidly expanding plasma volume. It also acts as a vehicle for drug delivery and can be used to flush wounds or body cavities.

⚡ Pharmacokinetics Summary

Absorption: When administered intravenously, sodium chloride is immediately available in the bloodstream. Orally, it is rapidly absorbed from the gastrointestinal tract.

Distribution: Sodium and chloride distribute primarily in the extracellular fluid (ECF). Sodium is actively transported across cell membranes via Na+/K+-ATPase, maintaining a high extracellular concentration. Chloride follows sodium passively.

Metabolism: Sodium and chloride are not metabolized; they are excreted unchanged.

Excretion: Excreted primarily by the kidneys. Renal excretion is regulated by glomerular filtration, aldosterone, and natriuretic peptides. Small amounts are lost in feces and sweat.

Half-Life: Not applicable; electrolytes are not cleared in a first-order manner. The half-life depends on renal function and hydration status.

Bioavailability: 100% when administered intravenously; oral bioavailability is also high, but absorption may be influenced by gastrointestinal motility.

Protein Binding: Negligible.

Available Formulations & Strengths

Injectable Solution (IV) 0.45%, 0.9%, 3%, 5%, 7.5%, 23.4% (IV)

Oral Solution Various concentrations (PO)

Topical Irrigation Solution 0.9% (Topical)

Ophthalmic Solution 0.9% (Ophthalmic)

Contraindications & Clinical Warnings

Contraindications:

Hypernatremia
Hyperchloremia
Fluid overload (e.g., congestive heart failure, pulmonary edema)
Severe renal impairment with oliguria/anuria
Concurrent use of corticosteroids or corticotropin (may cause excessive sodium retention)

Warnings & Clinical Precautions:

Use with caution in patients with cardiac disease, renal insufficiency, or conditions predisposing to edema.
Rapid administration of hypertonic saline can cause osmotic demyelination syndrome; administer slowly and monitor serum sodium.
Monitor serum electrolytes, acid-base status, and hydration during prolonged therapy.
Do not use in animals with known hypersensitivity to sodium chloride.
Ensure proper aseptic technique when administering intravenously.

Adverse Effects & Reactions

Common:

Phlebitis at injection site
Fluid overload (if excessive administration)
Hypernatremia
Hyperchloremia

Serious / Severe:

Pulmonary edema
Cerebral edema
Osmotic demyelination syndrome (with rapid correction of hyponatremia)
Metabolic acidosis (if excessive chloride load)

Rare:

Allergic reactions
Extravasation injury

Key Drug Interactions

Interacting Drug / Class	Clinical Effect & Mechanism	Severity
Corticosteroids	May enhance sodium and fluid retention, increasing risk of edema and hypertension.	Moderate
Lithium	Sodium depletion may increase lithium toxicity; sodium chloride may reduce lithium levels.	Moderate
Diuretics (e.g., furosemide)	May increase sodium loss, counteracting the effects of sodium chloride; monitor electrolytes.	Moderate
ACE inhibitors	May cause hyperkalemia when combined with potassium-containing fluids; sodium chloride may be used cautiously.	Mild

Overdose & Toxicity Management

Signs of Toxicity:

Hypernatremia
Hyperchloremia
Fluid overload (pulmonary edema, peripheral edema)
Hypertension
CNS signs (confusion, seizures, coma)

Emergency Treatment Protocol: Discontinue sodium chloride administration. Provide supportive care: administer diuretics (e.g., furosemide) to promote fluid excretion, correct electrolyte imbalances slowly to avoid osmotic demyelination, and monitor cardiac and respiratory function. In severe cases, hemodialysis may be considered.

Food Animal Withdrawal Times

🥩 Meat: 0 days🥛 Milk: 0 days🥚 Eggs: 0 days

Sodium chloride is a naturally occurring electrolyte and is not subject to withdrawal periods. However, when used as a vehicle for other drugs, the withdrawal time of the active drug applies.

Storage, Handling & Regulatory Information

Storage Temperature: Room temperature (15-30°C)

Handling & Special Conditions: Store in airtight containers. Do not freeze. Protect from excessive heat.

Dispensing Status: Over-The-Counter (OTC)

Approval Status: Approved for veterinary use in various formulations (e.g., 0.9% sodium chloride injection).

Extra-Label (Off-Label) Use: Sodium chloride is a non-prescription item, but extra-label use in food animals must comply with AMDUCA regulations. It is generally considered low risk, but any use must be under veterinary supervision.

Clinical Pearls & Practice Notes

💡 Clinical Insights: Sodium chloride is a fundamental component of fluid therapy in veterinary medicine. Isotonic saline (0.9%) is the most commonly used crystalloid for resuscitation and maintenance, but it can cause hyperchloremic metabolic acidosis if used in large volumes. Hypertonic saline (7.5%) is valuable for rapid plasma volume expansion in hypovolemic shock, but must be used cautiously and followed by isotonic fluids. Always monitor serum electrolytes, hydration status, and acid-base balance. In patients with cardiac or renal disease, use lower volumes and rates. For topical use, sterile saline is safe for wound irrigation and ophthalmic flushing.

References & Literature

📚 Plumb's Veterinary Drug Handbook
📚 Papich Veterinary Pharmacology and Therapeutics
📚 Compendium of Veterinary Products (CVP)