Bioavailability & Solubility

NASAL DELIVERY - A Promising Route of Drug Delivery to the Brain: Scientific Considerations

Vinayak Pathak, MPharm, MBA, indicates after reviewing clinical experiments published in this area, it is evident that formulation design, altering the physico-chemical properties of the drug, addition of absorption enhancers, and mucoadhesive polymers did result in higher bioavailability of drugs in animal models via the nasal route when compared to parenteral administration of the same drug.

2017 GLOBAL DRUG DELIVERY & FORMULATION REPORT - Notable Technologies, Approvals, Transactions, Pipelines & Perspectives

This third annual report, a collaborative effort between team members at Drug Development & Delivery and PharmaCircle, provides a look back at 2016 in terms of approvals and developments in the area of drug delivery and formulation. The report continues to cover the following significant key points of interest, with the belief that understanding the past, even the recent past, can provide insights to what is possible.

EXECUTIVE INTERVIEW - Oasmia Pharmaceutical: Commercializing Technologies While Pursuing the US Market

Julian Aleksov, Executive Chairman of Oasmia Pharmaceutical, discusses his company’s efforts to enter the US market, its strategy to increase commercial adoption, and why it believes its underlying drug delivery system technology is significant not only within the oncology sector, but the entire pharmaceutical industry.

PLATFORM TECHNOLOGY - ​​The 3DNA® Platform for Targeted Drug Delivery

Robert C. Getts, PhD, and Jessica Bowers review how the 3DNA platform is composed entirely of noncoding DNA assembled through the sequential hybridization of single strands of DNA into a network of double-stranded nucleic acid having a controlled architecture, and multiple attachment sites for drug and targeting molecules.

Bioavailability and Solubility Challenges

Given that a large number of drugs fail to reach the market due to poor solubility and bioavailability, the industry is seeking various methods to mitigate this challenge while many choose to re-formulate existing product candidates. Either way, the demand for novel bioavailability and solubility enhancement methods has grown significantly. To cater to this increasing demand, many contract manufacturers and technology developers have emerged.

What is Solubility?

Solubility is the ability for a drug to be dissolved in an aqueous medium. Drug solubility is defined as the maximum concentration of a substance that can be completely dissolved in a given solvent at a certain temperature and pressure level.

Solubility of drugs is measured by the amount of solvent needed to dissolve one gram of the drug at a specific temperature. For example, a drug that is very soluble needs less than one part solvent to dissolve one gram of the drug. How soluble a drug is varies widely—a drug that is considered soluble needs 10-30 parts, one that is slightly soluble needs 100-1,000 parts and one that is practically insoluble or insoluble needs more than 10,000 parts. How soluble a drug is depends on the solvent, as well as temperature and pressure.

Since 1975, approximately 60 marketed drugs have leveraged solubilization technologies to enhance oral bioavailability. In the preceding 36 years, from the time the FDA required submission of an NDA in 1938, solubilization technology was virtually unused on a regular basis. Apparently, the disease areas focus, drug discovery methodologies, and the lack of mature solubilization platforms restricted the use prior to the 1970s.

In comparison, the past nearly 4 decades have shown robust growth in the reliance on solubilization platforms, accounting on average for around 9% of all NMEs approved from 1975 through 2022, and more than 10% in the past decade. Some years stand out to validate the need and use of solubilization platforms. For example, in 2005, 20% of NMEs approved used technologies including solid dispersion, lipid, and nanocrystal platforms. The data for the most recent 4-year period (2010-2013) seems to represent a slight decline in growth, but it is still early in the decade, and the data set is relatively small. Based on the trends throughout the past 4 decades and the changing chemical space in drug development, we expect the decade will show additional and significant current growth in use of solubilization technologies once we have visibility into the full 10-year period.

Bioavailability & Solubility Impediments

The biggest impediment in addressing bioavailability issues likely lies with a lack of deep familiarity with enabling technologies. Improving drug bioavailability begins with a thorough evaluation of the API’s physical and chemical properties in relation to solubilization in the dose, but more importantly its dissolution in vivo at the site of absorption.

These technologies, such as nanoparticles, cocrystals, computer-aided prodrug design, and electrospinning, represent innovations aimed at enhancing the solubility of a candidate molecule, particularly in the gastrointestinal tract. Technologies such as electrospinning, deep eutectic solvents, and ionic liquids are upcoming formulation approaches to enhance drug solubility, and as the science matures, and the relative strengths and weaknesses are better understood, we expect to see further application of these innovative approaches. They have shown to be successful for some compounds, and have a place alongside other bioavailability enhancement technologies, where each strategy has its benefits and corresponding liabilities. For them to be successful and widely adopted however, they will also have to provide a compelling benefit compared with other well-understood, and commercially precedented technologies, such as amorphous solid dispersions and lipid-based formulations.

Extreme compounds require either significant amounts of stabilizers to maintain the amorphous state or they are not amenable to common manufacturing technologies with reasonable cost of goods due to their low solubility in organic solvents. These include amorphous solid dispersions using polymethacrylate, cellulose, or povidone-based polymeric carriers, she says. In addition, thermostability of new molecular entities becomes an issue as most new molecules have melting points well above 400°F. Alternative production methods for amorphous solid dispersions can address these issues.