Skip to content
ClinCalc Pro
Menu
Calculators Drugs Pathways AI Dx Donate Get the App
Bronchodilator

Budesonide / Formoterol

Brand names: Symbicort, DuoResp Spiromax, Fobumix

This is a fixed-dose inhaler of the inhaled corticosteroid budesonide with the long-acting beta-2 agonist formoterol, used for maintenance asthma and COPD treatment and, in asthma, as combined maintenance and reliever therapy.

Dosing — being independently re-sourced

ClinCalc Pro is rebuilding its dose data from primary open sources — the manufacturer SmPC (eMC), the WHO Model Formulary and other official references — under clinician review. This drug's structured dose is not yet published here. Confirm all doses against the product SmPC and your local formulary before prescribing.

Clinical monograph

How it works

Budesonide reduces airway inflammation via glucocorticoid receptors while formoterol, a rapid-onset long-acting beta-2 agonist, relaxes bronchial smooth muscle.

Prescribing in practice

  • Most important: in asthma a long-acting beta-2 agonist must always be paired with an inhaled corticosteroid, so this combination should replace any separate LABA, and where used as maintenance-and-reliever therapy the single-inhaler regimen must be clearly understood.
  • Do not co-prescribe an additional separate LABA, and ensure patients on a MART regimen do not also use a separate short-acting reliever inappropriately.
  • Prescribe by brand and device because budesonide/formoterol products are not all interchangeable.

Monitoring

Monitor asthma or COPD control, reliever use, inhaler technique, oral candidiasis, and growth in children on long-term inhaled corticosteroid.

Counselling the patient

  • Rinse the mouth after dosing to reduce oral thrush.
  • Follow the prescribed regimen carefully, especially if this inhaler is both preventer and reliever.

Evidence & guidelines

Budesonide/formoterol maintenance and reliever therapy is supported by randomised trials and endorsed in GINA and NICE asthma guidance.

Reference: BTS/SIGN Asthma 2023; NICE NG80 Asthma; Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.

Calculators
Drugs
Pathways