Evaluation of Physical and Chemical Changes in Pharmaceuticals Flown on Space Missions
Efficacy and safety of medications used for the treatment of astronauts in space may be compromised by altered stability in space. We compared physical and chemical changes with time in 35 formulations contained in identical pharmaceutical kits stowed on the International Space Station (ISS) and on Earth. Active pharmaceutical content (API) was determined by ultra- and high-performance liquid chromatography after returning to Earth. After stowage for 28 months in space, six medications aboard the ISS and two of matching ground controls exhibited changes in physical variables; nine medications from the ISS and 17 from the ground met the United States Pharmacopeia (USP) acceptance criteria for API content after 28 months of storage. A higher percentage of medications from each flight kit had lower API content than the respective ground controls. The number of medications failing API requirement increased as a function of time in space, independent of expiration date. The rate of degradation was faster in space than on the ground for many of the medications, and most solid dosage forms met USP standard for dissolution after storage in space. Cumulative radiation dose was higher and increased with time in space, whereas temperature and humidity remained similar to those on the ground. Exposure to the chronic low dose of ionizing radiation aboard the spacecraft as well as repackaging of solid dosage forms in flight-specific dispensers may adversely affect stability of pharmaceuticals. Characterization of degradation profiles of unstable formulations and identification of chemical attributes of stability in space analog environments on Earth will facilitate development of space-hardy medications.
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- Evaluation of Physical and Chemical Changes in Pharmaceuticals Flown on Space Missions
The AAPS Journal
Volume 13, Issue 2 , pp 299-308
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- pharmaceutical stability
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- Author Affiliations
- 1. Wyle Integrated Science and Engineering Group, 1290 Hercules Drive, Suite 120, Houston, Texas, 77058–2769, USA
- 2. Texas Medical Center, University of Texas, Houston, Texas, 77025, USA
- 3. Universities Space Research Association, Houston, Texas, 77058, USA
- 4. Pharmacotherapeutics Laboratory, SK/Human Adaptation and Countermeasures Division, NASA Johnson Space Center, 2101 NASA Parkway, Houston, Texas, 77058, USA