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Chlorpromazine induced hyperphagia in the rat
Psychopharmacology Communications
|January 1, 1975
Summary
Chlorpromazine (CPZ) treatment in rats led to reduced weight gain. However, a temporary increase in feeding and motivation for food was observed on the first day of CPZ administration.
Area of Science:
- Pharmacology
- Neuroscience
- Animal Behavior
Background:
- Chlorpromazine (CPZ) is an antipsychotic medication known for its sedative effects.
- The impact of CPZ on feeding behavior and weight gain requires further investigation.
Purpose of the Study:
- To investigate the effects of chlorpromazine (CPZ) on weight gain and feeding behavior in rats.
- To explore the temporal dynamics and characteristics of CPZ-induced feeding responses.
Main Methods:
- Subcutaneous injections of chlorpromazine (CPZ) were administered to rats over a four-month period.
- Weight gain and feeding behavior were monitored and compared to saline-treated control groups.
- The onset, duration, and motivational aspects of feeding responses were analyzed.
Main Results:
- Rats treated with CPZ exhibited significantly less weight gain compared to controls.
- A transient hyperphagia (increased feeding) was observed on the first day of CPZ treatment.
- This hyperphagia was characterized by delayed onset (8 hours post-injection) and short duration (one day), alongside increased motivation for food.
Conclusions:
- CPZ administration leads to reduced overall weight gain in rats.
- The observed first-day hyperphagia is a time-limited effect, potentially linked to CPZ's sedative properties or metabolite accumulation.
- Sedation alone does not explain the hyperphagic response, suggesting a specific mechanism related to CPZ or its metabolites.