Oral Rehydration Solution (Pedialyte): Uses, Dosage, and Safety

Overview

Oral rehydration solution (ORS) is a precisely formulated mixture of water, salts, and sugar designed to treat and prevent dehydration. Available as Pedialyte, Drip Drop, generic ORS packets, and similar products, ORS is the gold standard for rehydration recommended by the World Health Organization for treating dehydration from diarrhea, vomiting, and other causes.

What Is Oral Rehydration Solution?

ORS contains a specific balance of:

Sodium: Replaces lost electrolytes
Glucose (sugar): Enhances sodium and water absorption
Potassium: Replaces losses from diarrhea/vomiting
Citrate or bicarbonate: Helps correct acidosis

Key principle: The glucose-sodium co-transport mechanism allows the intestine to absorb water even when damaged by illness—this is what makes ORS so effective.

Common Brand Names

Premixed solutions:

Pedialyte (various flavors)
Pedialyte AdvancedCare
Enfalyte
Store brands (CVS, Walgreens, etc.)

Powder packets:

Drip Drop ORS
Liquid I.V.
WHO/UNICEF ORS packets
Trioral

Primary Uses

Dehydration from:

Diarrhea (most common use)
Vomiting
Fever
Excessive sweating
Heat exposure
Illness reducing fluid intake

Who benefits most:

Infants and young children with gastroenteritis
Adults with acute diarrhea
Elderly at risk of dehydration
Anyone with mild to moderate dehydration

How to Use ORS

Premixed Solutions (Pedialyte)

Drink as directed on label
Small, frequent sips for vomiting
Do not dilute—already properly balanced
Refrigerate after opening; discard after 48 hours

Powder Packets

Mix with exact amount of water specified
Do not add sugar, salt, or flavorings
Use within 24 hours of mixing
Follow package directions precisely

Dosing Guidelines

Mild dehydration:

Children: 50-100 mL/kg over 4 hours
Adults: 500-1,000 mL over first hour, then as needed

Ongoing losses:

Replace each diarrheal stool with ORS
Children: 10 mL/kg per stool
Adults: 200-400 mL per stool

Signs You Need ORS

Mild to moderate dehydration:

Increased thirst
Dry mouth and lips
Decreased urination
Dark yellow urine
Fatigue
Dizziness when standing

Seek medical care for:

Severe dehydration (confusion, very dark urine, unable to drink)
Bloody diarrhea
High fever
Symptoms lasting more than 2 days
Infants under 6 months
Signs of dehydration in young children not improving with ORS

Why ORS Works Better Than Water Alone

Plain water doesn’t contain the electrolytes lost during illness. ORS works because:

Glucose activates sodium-glucose transporters in the intestine
This pulls sodium into cells, and water follows
Works even when intestinal cells are damaged by infection
Replaces both fluids AND electrolytes

Called “potentially the most important medical advance of the 20th century” by The Lancet for preventing millions of deaths from dehydration.

ORS vs Other Fluids

Fluid	Sodium	Glucose	Effectiveness
ORS	Optimal	Optimal	Best for dehydration
Sports drinks	Low	High	Inadequate for illness
Juice	Very low	Very high	Can worsen diarrhea
Water	None	None	Doesn’t replace electrolytes
Soda	Low	Very high	Can worsen diarrhea

When NOT to Use ORS Alone

Seek medical care instead if:

Severe dehydration present
Unable to keep fluids down despite small sips
Bloody or black stools
Severe abdominal pain
High fever (over 102°F/39°C)
Symptoms of shock (rapid heartbeat, cold hands/feet, confusion)

ORS cannot replace:

IV fluids for severe dehydration
Antibiotics if bacterial infection present
Medical evaluation for concerning symptoms

Storage and Safety

Store powder packets in cool, dry place
Check expiration dates
Premixed solutions: refrigerate after opening
Do not alter the formulation
Safe for pregnancy and breastfeeding

Making ORS at Home (Emergency Only)

If commercial ORS unavailable:

1 liter clean water
6 level teaspoons sugar
½ level teaspoon salt

Important: Homemade ORS is less reliable. Use commercial products when available.

Sources

World Health Organization — Oral Rehydration Salts Guidelines
CDC — Managing Acute Gastroenteritis Among Children
American Academy of Pediatrics — Oral Rehydration Therapy
UpToDate — Oral Rehydration Therapy