This article is part of PharmTech's supplement "Injectable Drug Delivery."
The rise in novel biopharmaceuticals has injected new life into the injectable delivery market. The demand for injectable technologies is growing, says George Perros, managing director for Greystone Associates, a technology consultancy based in New Hampshire, which in September 2009 published an analysis on Drug Delivery for Self-Adminstration: Devices, Drugs, Product Strategies and Forecasts. The following interview with Perros describes this evolving market and recent innovations.
PharmTech» What is your overall assessment of the future for injectables?
PharmTech» What are the main drivers of this evolution?
The challenge that keeps driving device evolution focuses on how to get these drugs into the hands of the patients for self-administration in a way that is safe, reliable, and economical. For drug products designed for self-injection, this means injection devices that are prefilled (also referred to as combination products).
Another issue for biological drug developers is the fragile nature of the drugs themselves, which necessitates they be transported and stored at low temperature—the so-called 'cold chain'—which adds to the cost of distribution. To avoid the problem of temperature-dependent stability, proteins and peptides are often processed and packaged in dry or powder form. These lyophilized drugs must be reconstituted prior to injection. Special injection devices have been developed that contain two chambers, one with the lyophilized active ingredient, and the second for the formulation liquid or diluent. Upon activation, the powder and liquid are allowed to mix in the correct proportions, before being injected.
The ability of patients to self-medicate reduces the economic and resource pressure of having a healthcare professional administer the drug to the patient. So the technology challenge is to design a delivery device that ensures that the drug is preserved properly, reconstituted properly if necessary, and administered at the right dose by a person who may have little or no experience with injectable devices.