Formoterol Interactions Explained
The following sections explain in detail the potentially negative interactions that can occur when
formoterol is combined with any of the drugs listed above.
Beta Blockers
Taking formoterol and a beta blocker together can decrease the effectiveness of both medications. People with
asthma should generally avoid beta blockers, as they may make their condition worse. While some beta blockers are less likely than others to interact with formoterol, all beta blockers can potentially cause problems.
Certain Diuretics
Taking formoterol and certain diuretics together can increase your risk of low potassium levels (hypokalemia), especially when you use formoterol more frequently than recommended. Talk to your healthcare provider before using these medications together.
Digoxin
Formoterol may decrease the level of digoxin in your blood, perhaps making it less effective. Your healthcare provider may need to monitor the level of digoxin in your blood and adjust your digoxin dosage as necessary, especially when you are starting or stopping formoterol.
Monoamine Oxidase Inhibitors
Formoterol should be used with extreme caution in combination with MAOIs because it may result in dangerously low
blood pressure (hypotension). Talk to your healthcare provider before combining formoterol with an MAOI.
Salmeterol
Formoterol should not be used with products containing
salmeterol, as this may increase the chance of a severe
asthma attack or even death.
Tricyclic Antidepressants
Formoterol should be used with extreme caution in combination with
tricyclic antidepressants because it may result in dangerously low blood pressure (hypotension) or an irregular heart rhythm (arrhythmia). Talk to your healthcare provider before combining formoterol with a tricyclic
antidepressant.
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