PHRMACOKOKINETIC AND PHRMACODYNAMIC DRUG EFFECT ON INFANT AND YOUNG PEOPLE.

Drug concentration and its impact on the body are largely determined by pharmacokinetics (PK) and pharmacodynamics (PD). Pharmacokinetics explains how a drug is absorbed, distributed, metabolized, and eliminated by the body, regulating concentration over time. The link between drug concentration at the site of action and the ensuing beneficial or detrimental effect is explained by pharmacodynamics. The strength and duration of a medicine's action can be affected by changes in drug concentration. It is easier to choose the right dose, dosing interval, and treatment plan when one is aware of the connection between PK and PD. New born, children and young adults may have very different Drug concentrations and effect due to age related changes in pharmacokinetics. Drug concentrations in the body can change due to developmental variations in absorption, distribution, metabolism, and excretion (ADME). Drug exposure and excretion can be impacted by changes in body water and fat, plasma protein binding, liver enzyme activity, and renal function. In order to determine and assess dosage-concentration-response relationships and to forecast. It can aid in drug development and be helpful in comprehending the connection between drug concentration and pharmacological response.