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Related Concept Videos

Drug Delivery: Parenteral Route01:29

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...
Prodrugs01:30

Prodrugs

Prodrugs are a class of pharmaceutical compounds that undergo a biotransformation process within the body to be converted into a pharmacologically active drug. Prodrugs are designed to improve the therapeutic properties of the parent drug, such as enhancing bioavailability, increasing stability, or reducing toxicity. The concept of prodrugs revolves around modifying the chemical structure of the original drug to make it more effective or convenient for administration.
Prodrugs help overcome...
Drug Delivery: Overview01:16

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 Routes01:22

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: Enteral Route01:18

Drug Delivery: Enteral Route

The enteral drug administration involves three primary routes: oral, sublingual, and buccal. Oral ingestion is the most prevalent, safe, economical, and convenient method for drug administration. However, it has certain drawbacks, including limited absorption due to the drug's low water solubility or poor membrane permeability, possible emesis from GI mucosa irritation, destruction of drugs by digestive enzymes or low gastric pH, and irregular absorption along with food or other drugs.
Drugs in...
Modified-Release Drug Delivery Systems: Site-Targeted01:24

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.

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Systemic and Local Drug Delivery for Treating Diseases of the Central Nervous System in Rodent Models
11:51

Systemic and Local Drug Delivery for Treating Diseases of the Central Nervous System in Rodent Models

Published on: August 16, 2010

Prodrug approaches for CNS delivery.

Jarkko Rautio1, Krista Laine, Mikko Gynther

  • 1Department of Pharmaceutical Chemistry, University of Kuopio, PO Box 1627, FI-70211, Kuopio, Finland. jarkko.rautio@uku.fi

The AAPS Journal
|May 1, 2008
PubMed
Summary

Developing prodrugs is key to overcoming central nervous system (CNS) drug delivery challenges. This review explores prodrug strategies like lipophilic and carrier-mediated systems to enhance drug effectiveness for brain disorders.

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Area of Science:

  • Pharmacology
  • Drug Delivery
  • Neuroscience

Background:

  • Central nervous system (CNS) drug delivery faces significant obstacles.
  • Prodrugs are modified drug molecules that become active after in vivo transformation.
  • Prodrugs improve drug properties for better therapeutic outcomes.

Purpose of the Study:

  • To review prodrug strategies for enhancing CNS drug delivery.
  • To highlight methods overcoming biological barriers to brain drug penetration.
  • To provide insights into current and emerging prodrug approaches for CNS disorders.

Main Methods:

  • Literature review of prodrug strategies for CNS delivery.
  • Analysis of prodrug types including lipophilic, carrier-mediated, and gene-directed enzyme prodrug therapy.
  • Synthesis of information on prodrug design and application in CNS drug development.

Main Results:

  • Prodrugs offer a versatile approach to improve drug physicochemical, biopharmaceutical, and pharmacokinetic properties.
  • Various prodrug strategies, including lipophilic and carrier-mediated systems, have been explored for CNS delivery.
  • Gene-directed enzyme prodrug therapy presents a targeted approach for CNS treatment.

Conclusions:

  • Prodrug strategies are essential for effective CNS drug delivery.
  • Further research into novel prodrug designs can overcome existing delivery barriers.
  • Prodrugs hold significant promise for treating neurological and other CNS diseases.