Drug interactions
Formoterol-mometasone + Trimethoprim
Severity: Minor
Formoterol-mometasone and Trimethoprim: 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
Both drugs have been associated with QT prolongation, although the evidence for trimethoprim is weak and inhaled formoterol has limited systemic exposure. Clinical risk is small except in high-risk patients.
What this interaction means in plain words
Formoterol-mometasone and Trimethoprim 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-mometasone belongs to Respiratory; Trimethoprim belongs to Anti Bacterial.
Why it happens
Possible additive QT prolongation; evidence for trimethoprim is limited.
What to do
No routine action is needed. Check ECG and potassium in patients with known QT prolongation or other risk factors.
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-mometasone
Other interactions of Trimethoprim
Frequently asked questions
Can I take Formoterol-mometasone with Trimethoprim?
MediHelp rates the interaction as minor. Formoterol-mometasone and Trimethoprim have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Both drugs have been associated with QT prolongation, although the evidence for trimethoprim is weak and inhaled formoterol has limited systemic exposure. Clinical risk is small except in high-risk patients.
How serious is the interaction between Formoterol-mometasone and Trimethoprim?
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 action is needed. Check ECG and potassium in patients with known QT prolongation or other risk factors.
What other medicines interact with Formoterol-mometasone?
MediHelp also lists interactions of Formoterol-mometasone with, for example, Amiodarone, Amisulpride, Amoxapine. The full list is on the Formoterol-mometasone page.
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