Toxicological study on rats fed haloperidol: 80 week chronic toxicity test

Area of Science:

• Pharmacology and Toxicology
• Neuroscience
• Animal Studies

Background:

• Haloperidol (HPL) is an antipsychotic medication.
• Long-term safety data, particularly regarding chronic administration effects, require thorough investigation.
• Understanding HPL's impact on general condition and behavior is crucial for clinical use.

Purpose of the Study:

• To evaluate the general condition and locomotor activity in Sprague-Dawley rats following chronic haloperidol administration.
• To assess the safety profile of haloperidol at a target dose of 1.0 mg/kg/day over 80 weeks.
• To identify potential adverse effects associated with long-term haloperidol exposure.

Main Methods:

• Administration of haloperidol (HPL)-admixed food to male and female Sprague-Dawley rats for 80 weeks.
• Monitoring of general condition, mortality, body weight, food and water consumption, and locomotor activity.
• Comparison of HPL-treated groups with age-matched control groups receiving normal food.

Main Results:

• No significant difference in mortality rates between HPL-treated and control groups.
• Development of vacuous chewing movements and blepharitis in HPL-treated animals; reduced locomotor activity without tolerance.
• Suppressed body weight gain in males; initial promotion followed by suppression in females; reduced water consumption in both sexes.

Conclusions:

• Chronic administration of haloperidol (HPL) at the tested doses does not appear to increase mortality risk.
• Observed side effects, including body weight alterations and blepharitis, necessitate careful monitoring during long-term HPL treatment.
• Reduced locomotor activity suggests potential neurobehavioral consequences of chronic haloperidol exposure.