Treating Dehydration at Home: Oral Rehydration Solutions
For mild to moderate dehydration at home, use oral rehydration solutions (ORS) containing 50-90 mEq/L of sodium, administered in small, frequent amounts—starting with one teaspoon every 1-2 minutes and gradually increasing as tolerated.
Assessment First: Determine Severity
Before starting treatment, assess the degree of dehydration 1:
- Mild (3-5% fluid deficit): Slightly decreased urine output, mild thirst
- Moderate (6-9% fluid deficit): Decreased skin turgor, sunken eyes, reduced urine output
- Severe (≥10% fluid deficit): Shock symptoms, altered mental status, minimal/no urine output—requires emergency medical care, not home treatment 1
The Core Treatment: Oral Rehydration Solutions
For Mild Dehydration (3-5% deficit)
- Administer 50 mL/kg of ORS over 2-4 hours 1
- Use solutions containing 50-90 mEq/L sodium
- In the U.S., commercially available products like Pedialyte (45 mEq/L) or Ricelyte (50 mEq/L) are appropriate 1
For Moderate Dehydration (6-9% deficit)
- Increase to 100 mL/kg of ORS over 2-4 hours 1
- Same administration technique as mild dehydration
Critical Administration Technique
The most common mistake is allowing rapid, large-volume drinking 1. Instead:
- Start with one teaspoon (5 mL) every 1-2 minutes using a spoon, syringe, or medicine dropper 1
- Gradually increase the amount as tolerated
- This approach succeeds in >90% of patients, even those with vomiting 1
Replace Ongoing Losses
During rehydration, continue replacing fluid losses 1:
- 10 mL/kg for each watery/loose stool
- 2 mL/kg for each vomiting episode
When Vomiting is Present
Don't abandon oral rehydration just because of vomiting 1:
- Administer 5-10 mL every 1-2 minutes
- Over 90% of vomiting patients can be successfully rehydrated orally with this technique
- The key is patience and small, frequent amounts
Alternative Fluids: What Works Beyond Commercial ORS
While ORS is optimal, recent evidence shows alternatives 2:
- Skim or low-fat milk appears to improve hydration status compared to water alone (though evidence is of very low certainty)
- Coconut water shows no advantage over plain water
- Avoid alcohol-containing beverages for rehydration
However, for adults who can maintain adequate fluid intake, plain water may be sufficient 3. ORS is most critical for children, elderly, and those with significant fluid losses.
Reassess After 2-4 Hours
After the initial rehydration period 1:
- If rehydrated: transition to maintenance (normal diet plus extra fluids)
- If still dehydrated: re-estimate deficit and restart rehydration
Red Flags: When to Seek Medical Care Immediately
Do not attempt home treatment if 1:
- Signs of severe dehydration (shock, altered mental status, no urine output)
- Bloody diarrhea (may require antibiotics)
- Inability to keep down even small amounts of fluid despite proper technique
- Symptoms worsen despite treatment
Special Populations
Children
- Continue breastfeeding on demand during rehydration 1
- For formula-fed infants, resume full-strength formula immediately after rehydration
- Keep ORS at home as a staple, like acetaminophen 1
Elderly
- At least 1.7 liters of fluid per 24 hours is needed 4
- Offer small amounts throughout the day rather than large volumes at once
- Elderly are at higher risk due to decreased thirst sensation and multiple medications 4, 5
Common Pitfalls to Avoid
- Allowing ad libitum drinking from a cup or bottle in dehydrated patients—this often triggers vomiting 1
- Using inappropriate fluids like sugary sodas or juices alone (high osmolarity can worsen diarrhea)
- Withholding food once rehydrated—early feeding reduces severity and duration 1
- Giving up on oral rehydration too quickly when vomiting is present
Why ORS Works
ORS exploits sodium-glucose cotransport in the small intestine to enhance water absorption 3. The specific electrolyte composition (particularly sodium 50-90 mEq/L) is what makes it superior to plain water or other beverages for active dehydration.