Drug interactions
Hydrochlorothiazide + Isoproterenol
Severity: Moderate
Hydrochlorothiazide and Isoproterenol: 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 agents can reduce serum potassium, so combined use may cause additive hypokalemia. This raises the risk of ventricular arrhythmias, especially in patients with cardiac disease.
What this interaction means in plain words
Hydrochlorothiazide and Isoproterenol 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; Isoproterenol belongs to Respiratory.
Why it happens
Thiazides increase renal potassium excretion while isoproterenol shifts potassium into cells via beta-2 stimulation.
What to do
Monitor serum potassium and ECG during isoproterenol therapy in patients on hydrochlorothiazide, and replace potassium as needed.
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 Isoproterenol
Frequently asked questions
Can I take Hydrochlorothiazide with Isoproterenol?
MediHelp rates the interaction as moderate. Hydrochlorothiazide and Isoproterenol 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 agents can reduce serum potassium, so combined use may cause additive hypokalemia. This raises the risk of ventricular arrhythmias, especially in patients with cardiac disease.
How serious is the interaction between Hydrochlorothiazide and Isoproterenol?
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 ECG during isoproterenol therapy in patients on hydrochlorothiazide, and replace potassium as needed.
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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