Drug interactions
Lofexidine + Metolazone
Severity: Moderate
Lofexidine and Metolazone: 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
Lofexidine lowers blood pressure and heart rate through central alpha-2 agonism, and metolazone adds blood pressure lowering through diuresis and volume depletion. The combination can cause excessive hypotension, dizziness and syncope. Metolazone-related electrolyte loss may also matter because lofexidine prolongs the QT interval.
What this interaction means in plain words
Lofexidine and Metolazone 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.
Lofexidine belongs to Central Nervous System; Metolazone belongs to Cardiovascular.
Why it happens
Additive hypotensive effects of central sympatholysis and diuretic-induced volume depletion, with electrolyte disturbance adding to QT risk.
What to do
Monitor blood pressure, heart rate and orthostatic symptoms, and check potassium and magnesium. Reduce doses or hold the diuretic if hypotension or bradycardia develops.
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 Metolazone
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 Lofexidine with Metolazone?
MediHelp rates the interaction as moderate. Lofexidine and Metolazone 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. Lofexidine lowers blood pressure and heart rate through central alpha-2 agonism, and metolazone adds blood pressure lowering through diuresis and volume depletion. The combination can cause excessive hypotension, dizziness and syncope. Metolazone-related electrolyte loss may also matter because lofexidine prolongs the QT interval.
How serious is the interaction between Lofexidine and Metolazone?
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 orthostatic symptoms, and check potassium and magnesium. Reduce doses or hold the diuretic if hypotension or bradycardia develops.
What other medicines interact with Metolazone?
MediHelp also lists interactions of Metolazone with, for example, Amifostine, Amlodipine-hydrochlorothiazide-valsartan, Amlodipine-olmesartan-hydrochlorothiazide. The full list is on the Metolazone page.
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