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Inter- and intraindividual variability in the concentration-effect (sedation) relationship of flunitrazepam
A Grahnén1, P Wennerlund, B Dahlström
1Professional Medical Consultants AB-PMC, Uppsala, Sweden.
British Journal of Clinical Pharmacology
|January 1, 1991
Summary
This study found a strong link between flunitrazepam levels in the blood and sedation. Results suggest current insomnia medication doses may be too high, potentially allowing for lower, effective 0.5 mg doses.
Area of Science:
- Pharmacology
- Clinical Pharmacology
Background:
- Flunitrazepam is a benzodiazepine used for insomnia.
- Understanding the dose-response relationship is crucial for safe and effective prescribing.
Purpose of the Study:
- To investigate the correlation between plasma flunitrazepam concentrations and the degree of sedation.
- To determine the effective dose for moderate sedation in healthy adults.
Main Methods:
- 20 healthy subjects received two 1 mg oral doses of flunitrazepam a week apart.
- Sedation was assessed blindly, with parallel plasma sampling over 48 hours.
- Sigmoid Emax model was used to analyze concentration-response data.
Main Results:
- A strong correlation was observed between plasma flunitrazepam levels and sedation.
- The EC50 (concentration for 50% maximal effect) ranged from 6.5-7.0 ng/mL.
- The concentration-response curve was steep, indicating an 'all or none' effect.
Conclusions:
- Current flunitrazepam dosage recommendations for insomnia (1-2 mg) may be excessive.
- A lower dose of 0.5 mg might be sufficient for moderate sedation in some individuals.
- Individual variability in response necessitates careful dose titration.