Chlorpromazine and Labetalol: interaction and safety
This source-based reference is not a personal treatment recommendation. The relevance and management of an interaction depend on the exact products, route, dose and clinical situation.
Interaction mechanism
A slow heart rate can increase susceptibility to ventricular arrhythmia associated with QT prolongation. Vasodilator or adrenergic effects may increase orthostatic hypotension.
Clinical significance and safety
Chlorpromazine and Labetalol: A slow heart rate can increase susceptibility to ventricular arrhythmia associated with QT prolongation. Vasodilator or adrenergic effects may increase orthostatic hypotension. Heart disease, a slow pulse and low potassium or magnesium can increase concern. A clinician determines whether ECG or electrolyte checks are needed. Fainting or new irregular palpitations require urgent assessment. Dizziness on standing or fainting can indicate excessive blood-pressure lowering; the treating team should assess falls risk and monitoring.
Using this information
This is a source-based reference record, not a recommendation to combine, stop or change medicines. A missing interaction record does not establish safe use. A qualified healthcare professional should consider the exact products, doses, other medicines and individual health circumstances.