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Pharmacokinetic interaction between indoramin and ethanol.
S M Abrams1, D M Pierce, A Johnston
1Department of Clinical Pharmacology, St Bartholomew's Hospital, London, UK.
Human Toxicology
|May 1, 1989
Summary
Ethanol increases indoramin bioavailability and sedation when taken orally. Alcohol did not affect intravenous indoramin pharmacokinetics but increased blood alcohol levels. This interaction has clinical implications.
Area of Science:
- Pharmacology
- Clinical Pharmacology
- Drug Interactions
Background:
- Alpha-adrenoceptor antagonists like indoramin are used clinically.
- Ethanol is a common substance with known interactions with medications.
- Understanding drug-ethanol interactions is crucial for patient safety.
Purpose of the Study:
- To investigate the pharmacokinetic interaction between ethanol and indoramin.
- To assess the impact of ethanol on indoramin bioavailability and elimination.
- To evaluate the combined sedative effects of ethanol and indoramin.
Main Methods:
- Young volunteers received oral or intravenous indoramin with or without ethanol (0.5 g/kg).
- Pharmacokinetic parameters (Cpmax, AUC, half-life) were measured.
- Sedation was assessed using a visual analogue scale.
Main Results:
- Oral indoramin with ethanol showed increased peak concentration (Cpmax) by 58% and area under the curve (AUC) by 25%.
- Ethanol did not alter the elimination half-life of indoramin.
- The combination of ethanol and indoramin resulted in greater sedation compared to indoramin alone.
Conclusions:
- Ethanol enhances the oral bioavailability of indoramin, possibly via increased absorption or reduced first-pass metabolism.
- Ethanol does not affect the pharmacokinetics of intravenous indoramin.
- Co-administration of ethanol and indoramin increases sedation, necessitating caution in clinical practice.