Oral Rehydration Solution Dosing for Infants
Oral rehydration solution (ORS), such as Pedialyte, is recommended for mild to moderate dehydration with a weight-based replacement regimen of 50–100 mL/kg over 2–4 hours. [1] Ongoing fluid losses should be replaced with additional ORS during the rehydration period. [1]
Medication Selection Algorithm
Pedialyte (ORS) should be selected over non-ORS drinks for treatment of dehydration due to acute gastroenteritis because ORS improves intestinal fluid absorption. [1]
Treatment Initiation Thresholds
ORS should be initiated for minimal to moderate dehydration when the infant can safely take oral fluids. [1] ORS should not be delayed by vomiting because vomiting often abates while ORS is continued in small, frequent amounts. [1]
Recommended Dose
Replacement of estimated fluid deficit (initial rehydration):
- 50–100 mL/kg ORS over 2–4 hours. [1]
Ongoing losses (additional ORS):
- Additional ORS should be given to replace ongoing diarrhea and/or vomiting losses while rehydration is being completed. [1]
Monotherapy Versus Combination Therapy
ORS is appropriate as initial therapy for mild to moderate dehydration. [1] Parenteral rehydration should be used for severe dehydration or when ORS is not tolerated or cannot be administered safely. [1]
Common Pitfalls to Avoid
Adult dosing should not be used in infants because it can lead to excessive fluid dosing. [1] ORS should not be substituted with free water or non-ORS beverages as the primary rehydration fluid. [1]
Target Rehydration Goals
The goal is replacement of the estimated fluid deficit using 50–100 mL/kg ORS over 2–4 hours with continued replacement of ongoing losses until hydration status improves. [1]