Drug interactions
Hydrochlorothiazide + Lofexidine
Severity: Moderate
Hydrochlorothiazide 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
Lofexidine lowers blood pressure and heart rate, and hydrochlorothiazide adds to the blood pressure lowering. Thiazide-induced hypokalemia or hypomagnesemia may also add to lofexidine's QT-prolonging potential.
What this interaction means in plain words
Hydrochlorothiazide 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.
Hydrochlorothiazide belongs to Cardiovascular; Lofexidine belongs to Central Nervous System.
Why it happens
Additive hypotensive effect (pharmacodynamic), plus electrolyte disturbance that may worsen QT risk.
What to do
Monitor blood pressure, heart rate and electrolytes, correcting potassium and magnesium. Reduce the dose or adjust the antihypertensive regimen if symptomatic hypotension or bradycardia occurs.
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 Hydrochlorothiazide
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 Hydrochlorothiazide with Lofexidine?
MediHelp rates the interaction as moderate. Hydrochlorothiazide 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. Lofexidine lowers blood pressure and heart rate, and hydrochlorothiazide adds to the blood pressure lowering. Thiazide-induced hypokalemia or hypomagnesemia may also add to lofexidine's QT-prolonging potential.
How serious is the interaction between Hydrochlorothiazide 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 electrolytes, correcting potassium and magnesium. Reduce the dose or adjust the antihypertensive regimen if symptomatic hypotension or bradycardia occurs.
What other medicines interact with Hydrochlorothiazide?
MediHelp also lists interactions of Hydrochlorothiazide with, for example, Dofetilide, Amifostine, Amiodarone. The full list is on the Hydrochlorothiazide page.
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