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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.

Bioavailability Enhancement: Drug Permeability Enhancement

Bioavailability Enhancement: Drug Permeability Enhancement

After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt secretion,...

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...

Modified-Release Drug Delivery Systems: Rate-Programmed II

Modified-Release Drug Delivery Systems: Rate-Programmed II

Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...

Site-Targeted Drug Delivery Systems: Polymeric Carriers

Site-Targeted Drug Delivery Systems: Polymeric Carriers

Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...

Modified-Release Drug Delivery Systems: Classification

Modified-Release Drug Delivery Systems: Classification

Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...

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Related Experiment Video

Updated: Jul 15, 2026

Generation of Cationic Nanoliposomes for the Efficient Delivery of In Vitro Transcribed Messenger RNA

Generation of Cationic Nanoliposomes for the Efficient Delivery of In Vitro Transcribed Messenger RNA

Published on: February 1, 2019

Liposomal drug delivery.

S Dean Allison¹

¹Drug Delivery, University of South Carolina College of Pharmacy, Columbia, SC 29208, USA. allison@cop.sc.edu

Journal of Infusion Nursing : the Official Publication of the Infusion Nurses Society

|April 7, 2007

Summary

Liposomes, made of phospholipids, enhance drug bioavailability for extended effects and reduced dosing. Formulation changes in liposomal drug products impact pharmacokinetics, toxicity, and clinical efficacy.

Area of Science:

Biochemistry
Pharmacology
Drug Delivery Systems

Background:

Liposomes are phospholipid vesicles mimicking cell membranes.
Liposome encapsulation enhances drug bioavailability and therapeutic effects.
Liposomal formulations offer targeted delivery to disease sites like tumors.

Purpose of the Study:

To describe the therapeutic advantages of liposomal drug delivery.
To detail how formulation changes affect liposomal drug products.
To analyze differences in pharmacokinetics, toxicity, and efficacy.

Main Methods:

Review of liposome composition and function.
Analysis of liposomal drug delivery mechanisms.
Comparison of different liposomal formulations for single active agents.

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Targeting Drugs to Larval Zebrafish Macrophages by Injecting Drug-Loaded Liposomes

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Last Updated: Jul 15, 2026

Generation of Cationic Nanoliposomes for the Efficient Delivery of In Vitro Transcribed Messenger RNA

Generation of Cationic Nanoliposomes for the Efficient Delivery of In Vitro Transcribed Messenger RNA

Published on: February 1, 2019

Targeted Plasma Membrane Delivery of a Hydrophobic Cargo Encapsulated in a Liquid Crystal Nanoparticle Carrier

Targeted Plasma Membrane Delivery of a Hydrophobic Cargo Encapsulated in a Liquid Crystal Nanoparticle Carrier

Published on: February 8, 2017

Targeting Drugs to Larval Zebrafish Macrophages by Injecting Drug-Loaded Liposomes

Targeting Drugs to Larval Zebrafish Macrophages by Injecting Drug-Loaded Liposomes

Published on: February 18, 2020

Main Results:

Liposome encapsulation improves drug bioavailability, extending treatment duration and reducing dosage.
Long-circulating liposomes show preferential accumulation at disease sites.
Formulation variations lead to significant differences in pharmacokinetic profiles, toxicity, and clinical outcomes.

Conclusions:

Liposomal drug delivery offers significant therapeutic advantages.
Understanding formulation-specific differences is crucial for optimizing liposomal drug therapy.
Liposomal encapsulation is a key strategy for enhancing drug efficacy and safety.