What Are Single- and Repeat-Dose Pharmacokinetics?

Single- and repeat-dose pharmacokinetic studies are critical pharmacokinetic analyses designed to evaluate the absorption, distribution, metabolism, and excretion of a test substance or active ingredient in the body following single- and repeat-dose administration. In addition to being a fundamental component of drug development processes, these studies play a significant role in assessing the safety and efficacy of biotechnological products, new molecules, biosimilars, and various therapeutic candidates.

Pharmacokinetic data reveal how long a compound remains in the body, which tissues it distributes to, which metabolic pathways it uses, and at what rate it is eliminated. This information is critical for determining safe and effective dosing regimens.

At NanoTox, within our Pharmacokinetics Unit, we offer comprehensive pharmacokinetic study services in accordance with GLP (Good Laboratory Practice) principles.

The Purpose of Single- and Repeat-Dose Pharmacokinetic Studies

These studies aim to evaluate the behavior of the test substance in the organism following single- and repeated-dose administrations.

Bu çalışmalar sayesinde:

• The absorption profile is determined,
• Tissue distribution is evaluated,
• Metabolic pathways are investigated,
• Elimination processes are examined,
• Dosage strategies are supported.

The data obtained provide essential information for safety assessments and clinical development processes.

Differences Between Single-Dose and Repeated-Dose Studies

Single-Dose Pharmacokinetics

Single-dose pharmacokinetic studies evaluate the behavior of the substance in the body following a single administration.

Bu çalışmalar belirlenir:

• Maximum plasma concentration (Cmax),
• Time to reach maximum concentration (Tmax),
• Area under the curve (AUC),
• Elimination half-life (t½)

are determined.

Repeat-Dose Pharmacokinetics

Repeat-dose pharmacokinetic studies, on the other hand, evaluate the pharmacokinetic changes that occur following multiple doses.

Bu çalışmalar sayesinde:

• Accumulation potential,
• Steady-state concentrations,
• Pharmacokinetic behavior over time,
• dose-dependent changes

can be investigated.

Why Are Pharmacokinetic Studies Important?

A substance’s therapeutic efficacy and safety are directly related to its pharmacokinetic properties. Insufficient or excessive exposure can affect treatment success and the safety profile.

Pharmacokinetic studies are widely used, particularly:

• In new drug development processes,
• In biosimilar product studies,
• To support toxicology studies,
• In clinical trial planning,
• In regulatory submissions

They are widely used.

Pharmacokinetic Parameters Evaluated

Within the scope of Single- and Repeat-Dose Pharmacokinetics studies:

• Cmax
• Tmax
• AUC
• Elimination half-life (t½)
• Volume of distribution (Vd)
• Clearance (CL)
• Steady-state concentration
• Accumulation rate
• Exposure assessments

are analyzed.

These parameters provide a comprehensive understanding of the substance’s behavior within the body.

GLP-Compliant Pharmacokinetic Studies

Pharmacokinetic studies conducted at NanoTox are carried out in accordance with international regulatory expectations and GLP principles.

Temel referans kaynakları:

• OECD GLP principles,
• ICH guidelines,
• FDA pharmacokinetic guidelines,
• EMA bioavailability and pharmacokinetic guidelines.

Thanks to this approach, the data obtained meet internationally recognized quality standards.

Reliable Pharmacokinetic Studies with NanoTox

NanoTox conducts Single- and Repeat-Dose Pharmacokinetics studies in accordance with international standards, leveraging its expert pharmacokinetic team, advanced analytical infrastructure, and GLP-compliant study system. We provide the reliable pharmacokinetic data required for drug development and safety assessment processes.

Please contact NanoTox for detailed information about Single- and Repeat-Dose Pharmacokinetics studies.