Drug interactions
Chlorpromazine + Lofexidine
Severity: Moderate
Chlorpromazine and Lofexidine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs cause sedation and lower blood pressure, so combined use can produce excess drowsiness, hypotension and bradycardia. Lofexidine also prolongs the QT interval, and chlorpromazine adds to this risk.
What this interaction means in plain words
Chlorpromazine and Lofexidine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Chlorpromazine belongs to Central Nervous System; Lofexidine belongs to Central Nervous System.
Why it happens
Additive central nervous system depression, hypotension and QT prolongation through pharmacodynamic effects.
What to do
Monitor blood pressure, heart rate and level of sedation, and obtain an ECG if other QT risk factors are present. Correct potassium and magnesium abnormalities and reduce doses if symptomatic.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Chlorpromazine
- Chlorpromazine + Dofetilide Contraindicated
- Chlorpromazine + Dronedarone Contraindicated
- Chlorpromazine + Droperidol Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Chlorpromazine + Metrizamide Contraindicated
- Chlorpromazine + Panobinostat Contraindicated
Other interactions of Lofexidine
- Adagrasib + Lofexidine Major
- Alfuzosin + Lofexidine Major
- Amiodarone + Lofexidine Major
- Amisulpride + Lofexidine Major
- Anagrelide + Lofexidine Major
- Apomorphine + Lofexidine Major
Frequently asked questions
Can I take Chlorpromazine with Lofexidine?
MediHelp rates the interaction as moderate. Chlorpromazine and Lofexidine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Both drugs cause sedation and lower blood pressure, so combined use can produce excess drowsiness, hypotension and bradycardia. Lofexidine also prolongs the QT interval, and chlorpromazine adds to this risk.
How serious is the interaction between Chlorpromazine and Lofexidine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure, heart rate and level of sedation, and obtain an ECG if other QT risk factors are present. Correct potassium and magnesium abnormalities and reduce doses if symptomatic.
What other medicines interact with Chlorpromazine?
MediHelp also lists interactions of Chlorpromazine with, for example, Dofetilide, Dronedarone, Droperidol. The full list is on the Chlorpromazine page.
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