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Drug Discovery: Overview

Drug Discovery: Overview

Drug discovery is a multifaceted process involving extensive screening, testing, and optimization of lead compounds to identify potential new drugs for therapeutic use. It combines several approaches, including screening large numbers of natural products, chemical modification of known active molecules, identification of new drug targets, and rational design based on biological mechanisms and drug-receptor structure. These approaches are carried out in both academic research laboratories and...

Drug Product Stability

Drug Product Stability

The long-term stability of drug products is critical to ensuring their quality, safety, and effectiveness over time. Stability directly influences a product's ability to maintain its intended characteristics, ensuring it performs as expected during its intended shelf life. Key attributes such as drug potency, impurities, dissolution, and other physicochemical measures of performance are tested to assess stability. These parameters indicate how well the product retains its quality over time and...

Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry

Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry

Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...

Pharmaceutical Alternatives: Stability-Related Therapeutic Nonequivalence

Pharmaceutical Alternatives: Stability-Related Therapeutic Nonequivalence

Generic intravenous (IV) drugs are considered bioequivalent to their branded counterparts due to their 100% bioavailability upon administration. However, variations in stability among different drug products can significantly influence their therapeutic performance, even if they are pharmaceutically equivalent.Cefuroxime, a prophylactic antimicrobial, is often used as a single-dose IV injection for patients undergoing coronary artery bypass grafting surgery. A 3 g dose typically provides...

Bioavailability Enhancement: Drug Stability Enhancement and GI Retention

Bioavailability Enhancement: Drug Stability Enhancement and GI Retention

Improving a drug's stability in the gastrointestinal (GI) tract is paramount for enhancing its bioavailability and therapeutic effectiveness. Various strategies are employed to protect the drug from the harsh gastric milieu and to ensure its release and absorption at the desired site within the GI tract.Polymer coatings are one such method used to shield drugs from the stomach's acidic environment. By preventing premature drug release, these coatings improve the bioavailability of unstable...

Modified-Release Drug Delivery Systems: Influencing Factors

Modified-Release Drug Delivery Systems: Influencing Factors

Modified-release drug delivery systems are designed to optimize the therapeutic effect of drugs by minimizing side effects, reducing the dosage required, and controlling drug release to align with pharmacokinetic and pharmacodynamic needs. The system depends on two key factors: the drug's release from the formulation and its movement through the body to the target site. Unlike conventional dosage forms, where absorption is the limiting step, the rate of drug release is the key determinant in...

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Related Experiment Video

Updated: Jun 18, 2026

Incorporating Target Protein Structure Flexibility and Dynamics in Computational Drug Discovery Using Ensemble-Based Docking Analysis

Incorporating Target Protein Structure Flexibility and Dynamics in Computational Drug Discovery Using Ensemble-Based Docking Analysis

Published on: June 20, 2025

Stability challenges in drug discovery.

Li Di¹, Edward H Kerns

¹Wyeth Research, 865 Ridge Road, Monmouth Jct., NJ 08852, USA. dil@wyeth.com

Chemistry & Biodiversity

|November 26, 2009

Summary

This summary is machine-generated.

Drug candidate stability is crucial for accurate screening and development. Early stability testing identifies problematic compounds, improving drug quality and reducing development risks.

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Area of Science:

Drug discovery and development
Medicinal chemistry
Pharmaceutical sciences

Background:

Compound stability is a critical determinant of drug candidate success.
Instability can lead to false positives in high-throughput screening (HTS), inaccurate bioassays, and flawed structure-activity relationships (SAR).
Consequences of instability include poor oral bioavailability, drug withdrawal, toxic degradation products, and formulation challenges.

Purpose of the Study:

To highlight the importance of early stability screening in drug discovery.
To outline common stability assessment methods used in early drug development.
To emphasize how stability screening enhances candidate quality and mitigates risks.

Main Methods:

Implementing early stability screening to identify labile chemotypes.
Utilizing various stability studies, including pH profile, gastrointestinal fluid stability, bioassay media stability, excipient compatibility, and prodrug screening.
Guiding structural modifications based on stability data.

Main Results:

Early identification of unstable compounds prevents downstream issues.
Stability data informs medicinal chemistry efforts for structural optimization.
Proactive stability assessment reduces the likelihood of late-stage failures.

Conclusions:

Integrating comprehensive stability testing early in the drug discovery pipeline is essential.
This strategy significantly improves the quality of drug development candidates.
Early stability screening minimizes risks associated with compound lability, leading to more robust drug development outcomes.