Formoterol Fumarate has 8 known drug interactions based on U.S. FDA drug labeling data. 4 are classified as major interactions requiring close medical supervision. Notable interactions include combinations with Drugs That Prolong Qtc Interval, Mao Inhibitors, Monoamine Oxidase Inhibitors (Maois). Patients taking Formoterol Fumarate should inform their healthcare provider of all current medications — including over-the-counter drugs and supplements — to avoid potentially harmful combinations. Data sourced from OpenFDA and the NIH National Library of Medicine.
- Total
- 8
- Major
- 4
- Moderate
- 4
Major (4)
- Formoterol Fumarate + Drugs That Prolong Qtc Interval— May potentiate cardiovascular effects of formoterol with increased risk of ventricular arrhythmias. Use with extreme cau…
- Formoterol Fumarate + Mao Inhibitors— May potentiate cardiovascular effects of formoterol. Use with extreme caution.
- Formoterol Fumarate + Monoamine Oxidase Inhibitors (Maois)— Effect of formoterol on cardiovascular system may be potentiated. Use with extreme caution.
- Formoterol Fumarate + Nonselective Beta-Adrenergic Antagonists— May inhibit therapeutic effects of formoterol and cause severe bronchospasm in COPD patients. Use only when medically ne…
Moderate (4)
- Formoterol Fumarate + Diuretics— May potentiate hypokalemia or ECG changes with formoterol. Use with caution.
- Formoterol Fumarate + Potassium Supplements— ECG changes and hypokalemia from these diuretics can be worsened by formoterol, especially at higher doses. Caution advi…
- Formoterol Fumarate + Topical Steroids— May potentiate hypokalemic effect of formoterol. Use with caution.
- Formoterol Fumarate + Xanthine Derivatives— May potentiate hypokalemic effect of formoterol. Use with caution.