Drug interactions
Atenolol-chlorthalidone + Methyclothiazide
Severity: Moderate
Atenolol-chlorthalidone and Methyclothiazide: 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
Chlorthalidone and methyclothiazide are both thiazide-type diuretics, so combining them duplicates therapy and increases the risk of hypokalemia, hyponatremia, hypomagnesemia and volume depletion. There is rarely a reason to use two together.
What this interaction means in plain words
Atenolol-chlorthalidone and Methyclothiazide 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.
Why it happens
Duplicate inhibition of the distal tubule sodium-chloride cotransporter, causing additive electrolyte loss and diuresis.
What to do
Avoid therapeutic duplication and use a single thiazide-type agent. If both are given, monitor electrolytes and renal function closely.
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 Atenolol-chlorthalidone
Frequently asked questions
Can I take Atenolol-chlorthalidone with Methyclothiazide?
MediHelp rates the interaction as moderate. Atenolol-chlorthalidone and Methyclothiazide 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. Chlorthalidone and methyclothiazide are both thiazide-type diuretics, so combining them duplicates therapy and increases the risk of hypokalemia, hyponatremia, hypomagnesemia and volume depletion. There is rarely a reason to use two together.
How serious is the interaction between Atenolol-chlorthalidone and Methyclothiazide?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid therapeutic duplication and use a single thiazide-type agent. If both are given, monitor electrolytes and renal function closely.
What other medicines interact with Atenolol-chlorthalidone?
MediHelp also lists interactions of Atenolol-chlorthalidone with, for example, Acebutolol, Aldesleukin, Amiodarone. The full list is on the Atenolol-chlorthalidone page.
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