Drug interactions
Hydrochlorothiazide + Minoxidil
Severity: Moderate
Hydrochlorothiazide and Minoxidil: 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 lower blood pressure, and the combination is used deliberately in resistant hypertension. A thiazide or loop diuretic is usually needed to counter the sodium and water retention caused by minoxidil, but additive hypotension can occur.
What this interaction means in plain words
Hydrochlorothiazide and Minoxidil 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; Minoxidil belongs to Cardiovascular.
Why it happens
Additive antihypertensive effect from direct arteriolar vasodilation (minoxidil) plus diuresis and volume reduction (thiazide).
What to do
Monitor blood pressure, heart rate, weight and electrolytes when starting or adjusting either drug and titrate doses gradually. Watch for orthostatic hypotension.
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 Minoxidil
Frequently asked questions
Can I take Hydrochlorothiazide with Minoxidil?
MediHelp rates the interaction as moderate. Hydrochlorothiazide and Minoxidil 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 lower blood pressure, and the combination is used deliberately in resistant hypertension. A thiazide or loop diuretic is usually needed to counter the sodium and water retention caused by minoxidil, but additive hypotension can occur.
How serious is the interaction between Hydrochlorothiazide and Minoxidil?
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, weight and electrolytes when starting or adjusting either drug and titrate doses gradually. Watch for orthostatic hypotension.
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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