Taking Budesonide/Formoterol (Symbicort)? Learn which medications, supplements, and foods can interact with it, and what to tell your doctor before starting.
If you take Budesonide/Formoterol (sold as Symbicort or Breyna) for asthma or COPD, you're probably taking other medications too. Maybe a blood pressure pill, an antidepressant, or even a daily multivitamin. What you might not realize is that some of these can interact with Budesonide/Formoterol in ways that affect how well it works — or increase the risk of side effects.
Drug interactions don't always cause obvious problems, which is why it's so important to keep your doctor and pharmacist informed about everything you take. This guide walks you through the major and moderate interactions, supplements to watch out for, and how to have the right conversation with your healthcare team.
Drug interactions happen when one medication affects how another medication is absorbed, broken down, or used by your body. With Budesonide/Formoterol, there are two sets of interactions to think about — one for each active ingredient.
Budesonide is broken down (metabolized) by a liver enzyme called CYP3A4. Drugs that block or slow down this enzyme can cause Budesonide to build up in your body, leading to higher levels than intended. Higher levels mean a greater risk of corticosteroid side effects like immune suppression, high blood sugar, and bone density loss.
Formoterol works on beta2-adrenergic receptors in the lungs. Drugs that block these receptors (like beta-blockers) can reduce Formoterol's effectiveness. Other drugs that stimulate the cardiovascular system can amplify Formoterol's effects on heart rate and blood pressure.
These interactions carry the highest risk and should be carefully managed by your healthcare provider.
These medications significantly slow down the enzyme that breaks down Budesonide, causing it to accumulate in your body:
If you need to take one of these medications, your doctor may adjust your Budesonide/Formoterol dose, choose an alternative medication, or monitor you more closely for corticosteroid side effects such as adrenal suppression, increased blood sugar, or Cushing's syndrome symptoms (weight gain in the face and trunk, skin thinning, easy bruising).
Do not use another inhaler or medication containing a LABA while taking Budesonide/Formoterol. Using two LABAs together increases the risk of serious cardiovascular side effects. Other LABAs include:
Monoamine oxidase inhibitors — sometimes used for depression — can intensify the cardiovascular effects of Formoterol, potentially causing dangerous increases in heart rate and blood pressure. These include:
If you take an MAO inhibitor, Budesonide/Formoterol should be used with extreme caution. Your doctor may recommend an alternative asthma/COPD treatment.
Tricyclic antidepressants (TCAs) can also potentiate Formoterol's effects on the cardiovascular system. These include:
If you take a TCA, your doctor should be aware so they can monitor for heart rate changes, palpitations, or blood pressure effects.
Beta-blockers directly oppose the action of Formoterol. They block the same beta-adrenergic receptors that Formoterol activates, which can:
Common beta-blockers include:
If you need a beta-blocker for heart conditions or blood pressure, your doctor may choose a cardioselective beta-blocker (like Metoprolol or Bisoprolol) at the lowest effective dose, as these have less effect on the lungs. Non-selective beta-blockers like Propranolol should generally be avoided in people with asthma.
Diuretics (water pills) that don't spare potassium can worsen the potassium-lowering effect of Formoterol and Budesonide. This can lead to hypokalemia, which in turn can cause muscle weakness, cramps, and heart rhythm problems. These include:
Your doctor may monitor your potassium levels more frequently if you take both Budesonide/Formoterol and a non-potassium-sparing diuretic.
Formoterol can slightly prolong the QT interval (a measure of heart electrical activity). Taking it with other QT-prolonging drugs increases the risk of a dangerous heart rhythm called torsades de pointes. Common QT-prolonging drugs include:
Before starting Budesonide/Formoterol — or at any follow-up visit — make sure your doctor knows about:
Keep an updated medication list on your phone or in your wallet. Share it with every healthcare provider you see — not just your pulmonologist.
Drug interactions with Budesonide/Formoterol are manageable when your healthcare team knows what you're taking. The biggest risks come from strong CYP3A4 inhibitors (which increase Budesonide levels), other LABAs (which should never be combined), and medications that affect heart rhythm or blood pressure.
If you have questions about a specific medication or supplement, ask your pharmacist — they're often the best resource for catching potential interactions. And for more information about Budesonide/Formoterol, explore our other guides:
Need to fill your prescription? Medfinder can help you find Budesonide/Formoterol in stock near you.
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