Drug interactions
Hydrochlorothiazide + Potassium chloride
Severity: Moderate
Hydrochlorothiazide and Potassium chloride: 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
Hydrochlorothiazide promotes potassium loss, and potassium chloride is often given to offset this. The combination is usually beneficial, but potassium excess can cause hyperkalaemia, particularly with renal impairment or other potassium-raising drugs.
What this interaction means in plain words
Hydrochlorothiazide and Potassium chloride 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; Potassium chloride belongs to Gastrointestinal Tract.
Why it happens
Opposing effects on serum potassium: thiazide-induced renal potassium loss versus potassium supplementation.
What to do
Monitor serum potassium and renal function periodically, and adjust the potassium dose to maintain normal levels.
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 Potassium chloride
Frequently asked questions
Can I take Hydrochlorothiazide with Potassium chloride?
MediHelp rates the interaction as moderate. Hydrochlorothiazide and Potassium chloride 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 promotes potassium loss, and potassium chloride is often given to offset this. The combination is usually beneficial, but potassium excess can cause hyperkalaemia, particularly with renal impairment or other potassium-raising drugs.
How serious is the interaction between Hydrochlorothiazide and Potassium chloride?
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 serum potassium and renal function periodically, and adjust the potassium dose to maintain normal levels.
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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