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Transdermal Drug Delivery Systems

Transdermal Drug Delivery Systems

Transdermal drug delivery systems (TDDS) enable the controlled release of drugs across the skin into systemic circulation. They are particularly advantageous for drugs with short half-lives or narrow therapeutic indices, as they maintain consistent plasma concentrations and reduce the risk of subtherapeutic or toxic levels.TDDS are categorized into monolithic, reservoir, and mixed systems. Monolithic systems embed the drug in a polymer matrix, where diffusion governs release. Reservoir systems...

Drug Delivery: Overview

Drug Delivery: Overview

The selection of a drug's delivery route depends upon its physicochemical properties, including lipid or water solubility and ionization, as well as the therapeutic requirement, such as immediate or sustained effect. These routes can be divided into three primary categories: enteral, parenteral, and topical.
Enteral delivery involves administering drugs directly through swallowing, sublingual placement, or buccal application. Orally administered drugs predominantly navigate the gastrointestinal...

Drug Delivery: Miscellaneous Routes

Drug Delivery: Miscellaneous Routes

Drug delivery methods like oral inhalation, nasal sprays, transdermal patches, eye drops, intravitreal injection, and rectal administration provide localized effects with reduced toxicity.
Oral inhalation and nasal sprays swiftly transfer drugs across the respiratory epithelium's mucosal layer. Inhaled glucocorticoids and bronchodilators directly target lung conditions such as asthma, while fluticasone nasal spray mitigates allergic rhinitis.
Transdermal patches transport drugs through the...

Modified-Release Drug Delivery Systems: Site-Targeted

Modified-Release Drug Delivery Systems: Site-Targeted

Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.

Drug Delivery: Parenteral Route

Drug Delivery: Parenteral Route

The parenteral route is a critical method of drug administration. It delivers compounds directly into the systemic circulation and bypasses the gastrointestinal tract. This approach is particularly advantageous for drugs that exhibit poor absorption or instability when administered orally.
There are three primary parenteral routes: intravenous (IV), intramuscular (IM), and subcutaneous (SC). The IV route introduces the drug directly into the bloodstream, ensuring immediate action. The IM route...

Oral Drug Delivery Systems: Introduction

Oral Drug Delivery Systems: Introduction

Oral drug delivery is the most common route of administration due to its convenience, cost-effectiveness, and high patient compliance. It enables precise formulation to ensure proper drug dosage and bioavailability. The development of oral dosage forms considers drug properties such as solubility, stability, and absorption to optimize therapeutic efficacy.Tablets, capsules, liquids, and chewable formulations enhance drug stability, mask undesirable tastes, and improve patient experience.

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Related Experiment Video

Updated: May 23, 2026

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging

Published on: November 24, 2021

Dermal drug delivery: Revisited.

S Khandavilli¹, R Panchagnula

¹Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research (NIPER), Sector 67, Mohali Punjab 160062, India.

Drug Discoveries & Therapeutics

|April 17, 2012

Summary

Transdermal drug delivery overcomes skin barriers for potent, lipophilic molecules. This approach also enables effective delivery of genomics and proteomics-based therapeutics via the skin's stem cell compartment.

Area of Science:

Dermatology
Pharmaceutics
Biotechnology

Background:

The skin's complex structure limits conventional drug delivery, especially for potent, lipophilic compounds.
High-throughput screening and combinatorial chemistry yield molecules challenging for traditional administration routes.
Genomics and proteomics advancements require innovative delivery systems to harness their potential.

Purpose of the Study:

To explore transdermal delivery as a viable strategy for lipophilic drugs.
To highlight the potential of skin as a delivery route for gene and protein therapeutics.
To address the limitations of conventional drug administration for novel drug candidates.

Main Methods:

Review of existing literature on skin barrier function and drug transport.

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A Method for Determination and Simulation of Permeability and Diffusion in a 3D Tissue Model in a Membrane Insert System for Multi-well Plates

A Method for Determination and Simulation of Permeability and Diffusion in a 3D Tissue Model in a Membrane Insert System for Multi-well Plates

Published on: February 23, 2018

Related Experiment Videos

Last Updated: May 23, 2026

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging

Visualizing and Quantifying Pharmaceutical Compounds within Skin using Coherent Raman Scattering Imaging

Published on: November 24, 2021

A Method for Determination and Simulation of Permeability and Diffusion in a 3D Tissue Model in a Membrane Insert System for Multi-well Plates

A Method for Determination and Simulation of Permeability and Diffusion in a 3D Tissue Model in a Membrane Insert System for Multi-well Plates

Published on: February 23, 2018

Analysis of transdermal delivery systems for lipophilic molecules.

Evaluation of the epidermis's stem cell compartment for therapeutic delivery.

Main Results:

Transdermal delivery effectively bypasses skin's restrictive barriers for lipophilic drugs.
The skin's unique properties, including the epidermal stem cell niche, support novel therapeutic delivery.
Conventional administration routes remain a challenge for many newly discovered potent molecules.

Conclusions:

Transdermal drug delivery presents a promising solution for administering lipophilic drugs and advanced biologics.
Leveraging the skin's biological features can enhance the efficacy of diverse therapeutic modalities.
Further research into transdermal systems is crucial for realizing the full potential of modern drug discovery.