Ringer’s Solution
Ringer’s Solution is an electrolyte replacement fluid.
Group
Electrolyte replacement fluid
Mechanism of Action
Supplies sodium, potassium, calcium and chloride to expand extracellular fluid; plain Ringer solution has no metabolizable buffer.
Dose Rates
Dogs
| Use / stage | Dose | Route | Schedule | Instructions |
|---|---|---|---|---|
| Maintenance fluids | Reference only | IV | 55-65 mL/kg/day IV, SC or IP. The reported guidance also approximates this as 2.5 mL/kg/hour. | |
| Maintenance fluids | Reference only | SC | 55-65 mL/kg/day SC; balance absorption and hydration needs. | |
| Maintenance fluids | Reference only | IP | 55-65 mL/kg/day IP, as reported. | |
| Dehydration replacement | Reference only | IV | Moderate dehydration: 15-30 mL/kg/hour IV; severe: 50 mL/kg/hour IV, with reassessment and overload monitoring. |
Cats
| Use / stage | Dose | Route | Schedule | Instructions |
|---|---|---|---|---|
| Maintenance fluids | Reference only | IV | 55-65 mL/kg/day IV, SC or IP. The reported guidance also approximates this as 2.5 mL/kg/hour. | |
| Maintenance fluids | Reference only | SC | 55-65 mL/kg/day SC; balance absorption and hydration needs. | |
| Maintenance fluids | Reference only | IP | 55-65 mL/kg/day IP, as reported. | |
| Dehydration replacement | Reference only | IV | Moderate dehydration: 15-30 mL/kg/hour IV; severe: 50 mL/kg/hour IV, with reassessment and overload monitoring. |
Large_animals
| Use / stage | Dose | Route | Schedule | Instructions |
|---|---|---|---|---|
| Maintenance fluids | Reference only | IV | 40-50 mL/kg/day IV, SC or IP; moderate dehydration 15-30 mL/kg/hour IV and severe 50 mL/kg/hour IV. |
Cattle
| Use / stage | Dose | Route | Schedule | Instructions |
|---|---|---|---|---|
| Calf dehydration | Reference only | IV | Moderate: total 45 mL/kg at 30-40 mL/kg/hour IV. Severe: total 80-90 mL/kg at 30-40 mL/kg/hour, up to 80 mL/kg/hour if necessary. Reassess continuously. |
Indications
- Fluid maintenance
- Dehydration replacement
Contraindications
- Fluid overload risk; reported maximum rate 80 mL/kg/hour is not a routine target.
Interactions
- Calcium can be incompatible with other medicines; do not add bicarbonate directly to a calcium-containing fluid.
Adverse effects
- Fluid overload and chloride-associated acidification.
Monitoring and Administration
Monitor hydration, pulmonary signs and electrolytes. Distinguish plain Ringer solution from lactated or acetate formulations. Replacement deficit in liters is body weight multiplied by fractional dehydration (e.g. 0.08 for 8%).
Plain Ringer reported electrolyte composition per liter: sodium 147 mEq, potassium 4 mEq, chloride 155 mEq and calcium 4 mEq. Salt masses are not provided.