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Photodegradation of furosemide solutions
1College of Pharmacy and Pharmaceutical Sciences, Florida A & M University, Tallahassee, USA.
Summary
Furosemide photodegradation follows first-order kinetics, with fastest degradation under long-wave UV light. Amber glass vials and foil-covered transparent vials effectively protected furosemide from fluorescent light-induced degradation.
Area of Science:
- Pharmaceutical Chemistry
- Photochemistry
- Drug Stability
Background:
- Furosemide is a widely used diuretic.
- Understanding its stability under light exposure is crucial for formulation and storage.
- Photodegradation can impact drug efficacy and safety.
Purpose of the Study:
- To investigate the photodegradation kinetics of furosemide.
- To identify optimal conditions for furosemide stability.
- To evaluate potential photoprotective strategies.
Main Methods:
- Furosemide solutions were exposed to fluorescent and UV light.
- Degradation rates were monitored over time.
- The effect of pH, ionic strength, and various additives was assessed.
- Protective packaging was evaluated.
Main Results:
- Furosemide photodegradation followed first-order kinetics.
- The optimal pH for stability was 7.
- Long-wave UV light induced the most rapid degradation.
- Tested photoprotective agents were ineffective.
- Amber glass and foil-covered vials provided complete protection against fluorescent light.
- A 50% propylene glycol vehicle offered slight photoprotection.
Conclusions:
- Furosemide is susceptible to photodegradation, particularly under UV light.
- Formulation pH and packaging are critical factors for maintaining furosemide stability.
- Light exposure should be minimized during storage and handling of furosemide formulations.