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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...

Intrauterine Drug Delivery Systems

Intrauterine Drug Delivery Systems

Controlled-release systems for intravaginal and intrauterine drug delivery have been developed primarily for the administration of contraceptive steroid hormones. These delivery routes circumvent first-pass hepatic metabolism, thereby enhancing bioavailability and allowing for reduced systemic dosages compared to oral administration. Such approaches contribute to improved therapeutic efficacy and patient compliance, particularly in long-term contraceptive regimens.Intravaginal Drug Delivery...

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...

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.

Modified-Release Drug Delivery Systems: Overview

Modified-Release Drug Delivery Systems: Overview

Modified-release dosage forms are designed to address the limitations of drugs with short biological half-lives. These forms maintain stable therapeutic drug concentrations over extended periods, reducing the need for frequent dosing. A consistent drug level helps minimize peak-trough fluctuations, which can reduce adverse effects, lower the risk of drug resistance, and improve overall treatment effectiveness.One common type of modified-release form is the extended-release (ER) formulation. ER...

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Related Experiment Video

Updated: Mar 6, 2026

Delivery of Antibodies into the Murine Brain via Convection-enhanced Delivery

Delivery of Antibodies into the Murine Brain via Convection-enhanced Delivery

Published on: July 18, 2019

Convection-Enhanced Delivery.

A M Mehta¹, A M Sonabend¹, J N Bruce²

¹Department of Neurological Surgery, Columbia University Medical Center, New York, NY, 10032, USA.

Neurotherapeutics : the Journal of the American Society for Experimental Neurotherapeutics

|March 17, 2017

Summary

This summary is machine-generated.

Convection-enhanced delivery (CED) offers targeted drug delivery past the blood-brain barrier for CNS diseases. Overcoming CED limitations is crucial for successful clinical application and future therapeutic developments.

Keywords:

Blood–brain barrier Central nervous system Convection-enhanced delivery Drug delivery Malignant gliomas Technique

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Area of Science:

Neuroscience
Biomedical Engineering
Pharmacology

Background:

Convection-enhanced delivery (CED) facilitates direct drug delivery into the central nervous system (CNS) interstitial spaces.
CED bypasses the blood-brain barrier, enabling targeted and safe therapeutic concentrations.
Applicable for various CNS diseases like gliomas, Parkinson's, and Alzheimer's disease.

Purpose of the Study:

To review the physical principles of CED.
To identify limitations of CED and propose solutions.
To discuss clinical trials and future directions for CED.

Main Methods:

Review of physical principles governing CED.
Analysis of technological advancements and limitations.
Examination of clinical trial outcomes and challenges.

Main Results:

CED enables targeted drug delivery past the blood-brain barrier.
Despite advances, clinical trials have faced significant challenges.
Key parameters requiring further optimization for clinical success have been identified.

Conclusions:

CED is a promising technique for CNS drug delivery.
Addressing current limitations is essential for clinical translation.
Further research and development are needed to realize CED's full therapeutic potential.