Chlordiazepoxide effects on ethanol self-administration: dependence on concurrent conditions

Area of Science:

• Neuroscience
• Behavioral Pharmacology
• Addiction Research

Background:

• Ethanol self-administration is a key model for studying alcohol use disorder.
• Chlordiazepoxide, a benzodiazepine, is known to affect anxiety and drug-seeking behaviors.

Purpose of the Study:

• To investigate how chlordiazepoxide affects ethanol self-administration in rats.
• To determine if the choice of an alternative reinforcer influences chlordiazepoxide's effects on ethanol intake.

Main Methods:

• Rats were trained to choose between 5% ethanol and either water or 1% sucrose solution using a concurrent-schedule procedure.
• Acute doses of chlordiazepoxide (15 and 20 mg/kg) were administered.
• Ethanol-reinforced responding and intake were measured.

Main Results:

• Chlordiazepoxide (15 and 20 mg/kg) reduced ethanol intake when water was the alternative.
• When sucrose was the alternative, only the higher dose (20 mg/kg) significantly reduced ethanol intake.
• These effects occurred without substantial changes in baseline ethanol consumption across conditions.

Conclusions:

• The dose-effect curve for chlordiazepoxide's impact on ethanol self-administration is sensitive to the nature of concurrently available reinforcers.
• This suggests that the rewarding properties of alternative substances can modulate the efficacy of pharmacological interventions for alcohol use disorder.