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Physiological, pharmacokinetic, and pharmacodynamic changes in space
Annemarie Graebe1, Edgar L Schuck, Petra Lensing
1Department of Pharmacy Practice and Administration, Ernest Mario School of Pharmacy, Rutgers, State University of New Jersey, USA.
Journal of Clinical Pharmacology
|August 3, 2004
Summary
Astronauts use medications for various spaceflight ailments. Physiological changes in microgravity may significantly alter how drugs work, impacting astronaut health on long missions.
Area of Science:
- Space medicine
- Pharmacology
- Human physiology
Background:
- Medications have been utilized in spaceflight since 1967 for conditions like space motion sickness and pain.
- Increasing mission durations necessitate addressing acute illnesses common on Earth.
- The microgravity environment causes significant physiological alterations in astronauts.
Purpose of the Study:
- To examine the potential impact of spaceflight-induced physiological changes on drug efficacy and safety.
- To highlight the importance of understanding drug behavior in microgravity.
Main Methods:
- Review of physiological changes documented in astronauts during space missions.
- Analysis of known pharmacokinetic and pharmacodynamic principles in relation to microgravity effects.
Main Results:
- Microgravity induces changes including bone decalcification, muscle atrophy, and altered hormone levels.
- Reduced plasma volume, blood flow, and altered immune cell counts are observed.
- Changes in liver enzyme activity (microsomal P-450) may affect drug metabolism.
Conclusions:
- Spaceflight-induced physiological shifts can profoundly influence drug pharmacokinetics and pharmacodynamics.
- Further research is crucial to ensure medication safety and effectiveness for astronauts on extended missions.
- Understanding these interactions is vital for maintaining astronaut health in space.