Drug Development

Transdermal drug delivery, a vital technology of increasing interest, offers such benefits as controlled delivery for as long as a week and improved patient convenience and compliance.

Regular update from Washington.

On 20 February 2003, the US Food and Drug Administration (FDA) published a new draft guidance relating to 21 CFR Part 11. The new guidance mainly affects the compliance requirements of systems with a low risk and low impact on product quality; however, systems with a high risk and high impact on product quality, such as chromatography data systems or laboratory information management systems (LIMS), remain unaffected, as this article describes.

The US Food and Drug Administration is making changes in inspection processes, post-approval manufacturing changes and 21 CFR Part 11 policies to streamline oversight and improve product quality.

During autumn 2001, a Delphi survey was conducted using the Internet to discover the opinions of European experts from the pharmaceutical fields of industry, regulation and academia regarding pharmaceutical process validation. The Internet Delphi method was found to be an appropriate tool for exploring the opinions and experiences of pharmaceutical manufacturing because it allowed anonymous participation and discussion between geographically dispersed parties. However, to obtain reliable results, many factors were taken into account, as this article examines.

Oral dosage forms are the most popular way of taking medication, despite having some disadvantages compared with other methods. One such disadvantage is the risk of slow absorption of the active pharmaceutical ingredient (API), which can be overcome by administering the drug in liquid form and, therefore, possibly allowing the use of a lower dosage.

The pressure on the pharmaceutical industry to manufacture products faster and more cost-effectively has never been greater. Additionally, companies must also meet stringent regulations set by authorities such as the US Food and Drug Administration (FDA) and the European Agency for the Evaluation of Medicinal Products (EMEA). This article explores the importance of complying with regulations and validation, how to maintain compliance and looks at some of the consequences of non-compliance.

As parenteral drug delivery becomes more complex and sophisticated, excipients that can facilitate drug (or gene) delivery to specific therapeutic targets will be required. An overwhelming majority of these excipients are derived from natural sources.

As the US Food and Drug Administration (FDA) strives to streamline its regulatory process for bringing new drugs to market (see sidebar "Manufacturing data key to spurring drug development"), efforts to ensure the quality, safety and efficacy of dietary supplements and herbal medicines are gaining more attention.

The tabletting properties of a new coprocessed excipient for direct compression were compared with a physical mixture of its components (separately and with drugs) and the individual constituents. The compaction properties were also investigated. Results indicated that the new excipient has excellent flow properties and demonstrates enhanced compressibility.

Interest in more advanced drug delivery systems has increased, with an acceleration in the discovery and development of novel therapeutic macromolecules for targeted applications. Computational fluid dynamics is a design tool that allows producers of these and other products to evaluate different models rapidly and cost-effectively.

Non-toxic and biodegradeable, biologically active liposomes encapsulate therapeutics to provide an attractive drug delivery system for the future.

Progress in developing AIDS vaccines is focussing attention on the challenges involved in producing millions of doses for developing nations.

Brussels report

It has been demonstrated that the existing FDA dose content uniformity test has very poor statistical relevance, which has resulted in the acceptance of poor quality batches and the rejection of good quality batches. By using Bayesian Inference, a much improved test has been produced that allows the quality of a batch of drug product to be determined accurately, using a suitable number of samples for the quality of the batch.

Medicines and excipients are inseparable, with few exceptions - one cannot exist without the other. The Pharmaceutical Quality Group and other international bodies have developed good manufacturing practice (GMP) standards and guidelines to facilitate the effective supply of excipients. This article discusses the definition and significance of excipients, and highlights the importance of implementing the correct excipient manufacturing controls and standards.

The security of documents in the pharmaceutical industry has become a critical issue since the advent of electronic data transfer. Companies in Europe must comply with 21 CFR Part 11 if they sell in the US. The regulations also require that secure, computer-generated, time-stamped audit trails are used to record the date and time of operator entries and actions that create, modify or delete electronic records. In particular, the record change must not obscure previously recorded information.

The aim of this work was to investigate the compactibility, compressibility and drug release behaviour of different fractions of a commercially available ethyl cellulose.

Dry powder inhalers (DPIs) contain a powder which, when required, is discharged and inhaled. The therapeutic drug is manufactured in powder form as small particles a few micrometres in diameter. In many DPIs, the drug is mixed with much larger sugar crystals, such as lactose, and the smaller drug particles attach to these excipient particles, improving entrainment of the drug upon inhalation. This article examines how the application and combination of versatile processes such as milling, micronizing, sieving and air classification can be used to manufacture dedicated lactose products for practically every possible combination of active and excipient blend in DPIs.

The European Union is attempting to reform its current business environment in hopes of restoring its role in the lobal R&D sector.

In this study, the authors investigated the compression behavior of excipients with different molecular weights using the modified Fraser-Suzuki function and correlated the S-parameter of this function with Young's modulus.

The benefits of using computers and electronic records are proven in most fields of modern-day work, none more so than in laboratories. The opportunities for automation have improved productivity; the computational abilities have increased the accuracy of scientific data and allowed previously difficult or impossible analytical techniques to become routine affairs. This, in turn, has led to huge advances in drug discovery and in the chemical, biochemical and physical analysis of drugs and patients.

Using melt extrusion to prepare glass solutions of poorly water-soluble drugs with hydrophilic excipients offers an exciting and advantageous alternative to existing formulation methods such as spray-drying and co-melting. Investigating potential methods to increase water solubility begins early in drug development. Techniques described in this paper show how only a small quantity of drug can be used to determine its suitability for melt extrusion, allowing the method to be considered at the same time as salt screening and particle size reduction work, and could speed up the formulation process.

A limit test using ion mobility spectrometry (IMS) has the potential to dramatically reduce the time required for cleaning verification and cleaning method development. The traditional approach to cleaning verification, often using HPLC, is relatively resource intensive and can lead to significant delays in reporting results. The main advantage of IMS is that results are seen virtually instantaneously, so any necessary re-measurement can be done very quickly. If the results demonstrate cleanliness, production can resume in a matter of hours not days.

When choosing a CRO, take the time to conduct an in-depth evaluation of each department, paying special attention to the quality and training of its personnel.