Drug interactions
Formoterol + Primaquine
Severity: Moderate
Formoterol and Primaquine: 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
Primaquine has been associated with QT prolongation, and formoterol can add to this effect and lower potassium. The combined risk of arrhythmia is probably small but relevant in patients with cardiac risk factors.
What this interaction means in plain words
Formoterol and Primaquine 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.
Formoterol belongs to Respiratory; Primaquine belongs to Anti Parasitic.
Why it happens
Additive QT prolongation; primaquine effect is modest and less well characterized.
What to do
Check ECG and electrolytes in patients with heart disease or other QT-prolonging drugs. Correct potassium and magnesium deficits.
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 Formoterol
- Adagrasib + Formoterol Major
- Amiodarone + Formoterol Major
- Amisulpride + Formoterol Major
- Amitriptyline + Formoterol Major
- Amoxapine + Formoterol Major
- Arformoterol + Formoterol Major
Other interactions of Primaquine
- Pimozide + Primaquine Contraindicated
- Amiodarone + Primaquine Major
- Amisulpride + Primaquine Major
- Anagrelide + Primaquine Major
- Arsenic trioxide + Primaquine Major
- Asenapine + Primaquine Major
Frequently asked questions
Can I take Formoterol with Primaquine?
MediHelp rates the interaction as moderate. Formoterol and Primaquine 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. Primaquine has been associated with QT prolongation, and formoterol can add to this effect and lower potassium. The combined risk of arrhythmia is probably small but relevant in patients with cardiac risk factors.
How serious is the interaction between Formoterol and Primaquine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check ECG and electrolytes in patients with heart disease or other QT-prolonging drugs. Correct potassium and magnesium deficits.
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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