Drug interactions
Formoterol + Potassium acid
Severity: Minor
Formoterol and Potassium acid: minor 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
Formoterol shifts potassium into cells and can lower serum potassium, while potassium phosphate supplements raise it. The two effects oppose each other, so the net effect is unpredictable and is usually not harmful, but it matters in patients with renal impairment or unstable potassium levels.
What this interaction means in plain words
Formoterol and Potassium acid have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Opposing effects on serum potassium: beta-2 stimulation drives intracellular uptake while the supplement adds potassium.
What to do
No routine dose change is required. Check serum potassium if the patient has renal impairment, is acutely ill, or is on high doses of formoterol or potassium.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Formoterol
- Adagrasib + Formoterol Major
- Amiodarone + Formoterol Major
- Amisulpride + Formoterol Major
- Amitriptyline + Formoterol Major
- Amoxapine + Formoterol Major
- Arformoterol + Formoterol Major
Frequently asked questions
Can I take Formoterol with Potassium acid?
MediHelp rates the interaction as minor. Formoterol and Potassium acid have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Formoterol shifts potassium into cells and can lower serum potassium, while potassium phosphate supplements raise it. The two effects oppose each other, so the net effect is unpredictable and is usually not harmful, but it matters in patients with renal impairment or unstable potassium levels.
How serious is the interaction between Formoterol and Potassium acid?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine dose change is required. Check serum potassium if the patient has renal impairment, is acutely ill, or is on high doses of formoterol or potassium.
What other medicines interact with Formoterol?
MediHelp also lists interactions of Formoterol with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Formoterol page.
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