Drug Dosing: Infants and Children

Pediatric patients require different dosages than adults due to variations in body surface area, total body water, and extracellular fluid per kg body weight.

Dosing also considers pharmacokinetics and pharmacology differences across various age groups, including preterm newborns, infants, young children, older children, and adolescents.

The pediatric dose can be calculated using various formulae based on body surface area, age, or weight. This helps to better correlate with a child’s dosage requirements, cardiac output, renal blood flow, glomerular filtration, and organ maturity.

Pediatric patients often require larger doses than adults due to their larger body surface area and V_D,

Neonates typically have more total body water than adults, resulting in a larger V_D for hydrophilic drugs and a smaller V_D for lipophilic drugs.

They also have immature organs, necessitating dosage adjustments.

Additionally, pediatric dosage forms often involve liquid formulations with calibrated droppers and added flavors, allowing for accurate dosing and patient compliance.