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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: 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...

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: 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: Continuous-Release Systems

Oral Drug Delivery Systems: Continuous-Release Systems

Continuous-release drug delivery systems offer a strategic approach to maintaining therapeutic drug levels over extended periods following oral administration. By modulating the release rate of active pharmaceutical ingredients, these systems minimize fluctuations in plasma concentrations, which enhances clinical efficacy and reduces the need for frequent dosing. Such characteristics make them particularly advantageous in managing chronic diseases where patient adherence and stable drug...

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: May 17, 2026

Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery

Development, Characterization, and Evaluation of CAGE-based Ionic Liquid Systems for Transdermal Delivery

Published on: September 26, 2025

MAOIs and transdermal delivery.

Chad M Vandenberg¹

¹Department of Pharmacy Practice and the Center for Clinical Research, Mercer University College of Pharmacy and Health Sciences, Atlanta, Georgia, USA.

The Journal of Clinical Psychiatry

|October 13, 2012

Summary

This summary is machine-generated.

Monoamine oxidase inhibitors (MAOIs) are effective antidepressants, especially for treatment-resistant depression. A new transdermal selegiline patch reduces side effects and dietary restrictions associated with oral MAOIs.

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Area of Science:

Pharmacology and Psychiatry
Neuroscience

Background:

Monoamine oxidase inhibitors (MAOIs) are effective antidepressants, particularly for atypical or treatment-resistant depression.
Oral MAOIs carry risks, including hypertensive crisis due to tyramine absorption, limiting their first-line use.

Purpose of the Study:

To evaluate the safety and efficacy of a transdermal selegiline patch for depression.
To assess the potential of transdermal delivery to mitigate MAOI-related adverse events and dietary restrictions.

Main Methods:

A transdermal formulation of selegiline was developed to bypass gastrointestinal first-pass metabolism.
The study focused on the mechanism of action and clinical implications of transdermal MAOI delivery.

Main Results:

Transdermal selegiline delivers medication directly into circulation, bypassing GI metabolism.
This route substantially reduces the risk of tyramine-related adverse events.
A lower dose (6 mg/24 hours) achieves antidepressant effects with a steady 24-hour release, eliminating dietary restrictions.

Conclusions:

Transdermal selegiline offers a safer and more tolerable alternative for MAOI antidepressant therapy.
This formulation expands treatment options for patients unresponsive to first-line depression therapies.
Understanding MAOI mechanisms is crucial for safe and effective clinical prescription.