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Formoterol

AEMPS

Long-acting selective β2-agonist with rapid onset (rapid-onset LABA)

ATC code: R03AC13

Brand names: Foradil, Perforomist

Updated · Methodology

Indications

A

Asthma

First line

In asthma formoterol is used only combined with an inhaled corticosteroid. 2024 recommends ICS-formoterol (Symbicort, Fostair, Duoresp) in MART/SMART from step 1: a single inhaler used as needed for symptoms acts as both controller and reliever. The rapid onset (3–5 minutes) lets formoterol replace SABA in the reliever role. Isolated formoterol monotherapy in asthma is not used: the same risks described for salmeterol in the SMART trial apply. If formoterol was prescribed without an ICS as a stand-alone long-acting bronchodilator in asthma, consider seeking a second opinion.

Sources

  1. AEMPS: Ficha técnica de Formoterol (2023)
  2. GINA: Global Strategy for Asthma Management and Prevention (2024)
  3. GEMA: Guia Espanola para el Manejo del Asma (GEMA 5.4) (2024)
  4. Chest: The Salmeterol Multicenter Asthma Research Trial (SMART) (2006)
  5. Cochrane: Regular long-acting beta2-agonists for chronic asthma in adults and children where background therapy contains varied or no inhaled corticosteroid (2017)

ICD-10: J45 · ICD-11: CA23

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

F

Athletic endurance

Not recommended

Formoterol is used off-label by athletes and fitness influencers for «endurance gains» via β2-receptor stimulation. The hypothetical anabolic and metabolic effect in people without asthma is not supported by quality data. WADA 2024 lists formoterol as prohibited but allows inhalations up to 54 mcg/day with urine peak below 40 ng/mL (TUE with documented asthma). Biohacking above these limits produces tachycardia, tremor, hypokalaemia and arrhythmias. If formoterol is suggested without an asthma diagnosis to «improve cardio», consider seeking a second opinion.

Sources

  1. AEMPS: Ficha técnica de Formoterol (2023)
  2. WADA: World Anti-Doping Code: The 2024 Prohibited List (2024)
How to read tiers A–F
  • AStrong evidence – first or second line in international guidelines
  • BRecommended in selected cases
  • CStudy data contradict each other
  • DBenefit not proven, no documented harm
  • FDocumented harm, or risk without benefit

Mechanism of action

Selective β2-adrenoceptor agonist of bronchial smooth muscle. Lower lipophilicity than salmeterol gives a rapid onset – 3–5 minutes after inhalation – while keeping a 12-hour duration. This profile allowed ICS+formoterol (Symbicort, Fostair) to enter the 2024 MART/SMART regimen: a single inhaler serves as both controller and reliever as needed. Activates adenylyl cyclase, raises cAMP, relaxes smooth muscle and suppresses mediator release.

Safety

Boxed warning

Long-acting beta2-agonists (LABA), including formoterol, increase the risk of asthma-related death when used as monotherapy without an inhaled corticosteroid. In asthma formoterol is used only in fixed combination with an ICS. FDA Black Box 2010, AEMPS issued a parallel warning.

Contraindications

  • Hypersensitivity to formoterol or excipients
  • Monotherapy for asthma without inhaled corticosteroid
  • Tachyarrhythmias

Serious adverse effects

  • Paradoxical bronchospasm
  • Severe hypokalaemia
  • QT prolongation and arrhythmias
  • Hyperglycaemia
  • Anaphylactic reactions

Common adverse effects

  • Tremor
  • Headache
  • Palpitations
  • Throat irritation
  • Muscle cramps

Pregnancy: can you take Formoterol?

AEMPS summary of product characteristics (section 4.6): there are no adequate well-controlled studies in pregnant women, and data on formoterol in pregnancy are limited. In animal studies, formoterol caused implantation losses and reduced postnatal survival and birth weight. Formoterol is used during pregnancy only if the expected benefit justifies the potential risk to the fetus. Like other beta-2 agonists, it may inhibit labour by relaxing uterine smooth muscle.

Breastfeeding: can you take Formoterol?

Compatible. Hale L2. Inhaled systemic bioavailability is low; only minimal amounts reach milk.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

Label mentions17 mentions

Verbatim lines from the interaction sections, in the language of the label

From this drug’s label

  • Majorbetabloqueantesclass named in the label
    «Los bloqueantes beta-adrenérgicos pueden debilitar o antagonizar el efecto de este medicamento por lo que no deberían darse beta-bloqueantes (incluidos colirios) con Foradil Aerolizer a no ser que no…»

    AEMPS, section 4.5 · Open on CIMA

  • Moderateantidepresivos tricíclicosclass named in the label
    «Foradil Aerolizer, al igual que otros agonistas beta 2 , debe administrarse con precaución a pacientes que están siendo tratados con fármacos tales como quinidina, disopiramida, procainamida…»

    AEMPS, section 4.5 · Open on CIMA

  • Moderateantihistamínicosclass named in the label
    «Foradil Aerolizer, al igual que otros agonistas beta 2 , debe administrarse con precaución a pacientes que están siendo tratados con fármacos tales como quinidina, disopiramida, procainamida…»

    AEMPS, section 4.5 · Open on CIMA

  • Moderatebeta blockersclass named in the label
    «DRUG INTERACTIONS: • Beta-blockers may decrease effectiveness. Use with caution and only when medically necessary. ( 7.5 )»

    FDA, section 7 · Open on DailyMed

  • Moderatedigitálicosclass named in the label
    «El tratamiento concomitante con derivados de la xantina, esteroides o diuréticos puede potenciar el posible efecto hipopotasémico de los agonistas beta 2 (ver sección 4.4). La hipopotasemia puede…»

    AEMPS, section 4.5 · Open on CIMA

  • ModerateDisopyramide
    «Foradil Aerolizer, al igual que otros agonistas beta 2 , debe administrarse con precaución a pacientes que están siendo tratados con fármacos tales como quinidina, disopiramida, procainamida…»

    AEMPS, section 4.5 · Open on CIMA

  • Moderatediuréticosclass named in the label
    «El tratamiento concomitante con derivados de la xantina, esteroides o diuréticos puede potenciar el posible efecto hipopotasémico de los agonistas beta 2 (ver sección 4.4). La hipopotasemia puede…»

    AEMPS, section 4.5 · Open on CIMA

  • Moderatediureticsclass named in the label
    «DRUG INTERACTIONS: • Xanthine derivatives, steroids, diuretics, or non-potassium sparing diuretics may potentiate hypokalemia or ECG changes. Use with caution. ( 5.7 , 7.2 , 7.3 )»

    FDA, section 7 · Open on DailyMed

  • ModerateIMAOclass named in the label
    «Foradil Aerolizer, al igual que otros agonistas beta 2 , debe administrarse con precaución a pacientes que están siendo tratados con fármacos tales como quinidina, disopiramida, procainamida…»

    AEMPS, section 4.5 · Open on CIMA

  • Moderatemacrólidosclass named in the label
    «Foradil Aerolizer, al igual que otros agonistas beta 2 , debe administrarse con precaución a pacientes que están siendo tratados con fármacos tales como quinidina, disopiramida, procainamida…»

    AEMPS, section 4.5 · Open on CIMA

  • ModerateMAO inhibitorsclass named in the label
    «MAO Inhibitors, Tricyclic Antidepressants, QTc Prolonging Drugs: Formoterol, as with other beta 2 -agonists, should be administered with extreme caution to patients being treated with monoamine…»

    FDA, section 7 · Open on DailyMed

  • Moderatemedicamentos que prolongan el QTclass named in the label
    «Foradil Aerolizer, al igual que otros agonistas beta 2 , debe administrarse con precaución a pacientes que están siendo tratados con fármacos tales como quinidina, disopiramida, procainamida…»

    AEMPS, section 4.5 · Open on CIMA

  • ModerateQT-prolonging drugsclass named in the label
    «DRUG INTERACTIONS: • MAO inhibitors, tricyclic antidepressants and drugs that prolong QTc interval may potentiate effect on the cardiovascular system. Use with extreme caution. ( 7.4 )»

    FDA, section 7 · Open on DailyMed

  • ModerateQuinidine
    «Foradil Aerolizer, al igual que otros agonistas beta 2 , debe administrarse con precaución a pacientes que están siendo tratados con fármacos tales como quinidina, disopiramida, procainamida…»

    AEMPS, section 4.5 · Open on CIMA

  • Moderatethiazide diureticsclass named in the label
    «Non-potassium Sparing Diuretics: The ECG changes and/or hypokalemia that may result from the administration of non-potassium sparing diuretics (such as loop or thiazide diuretics) can be acutely…»

    FDA, section 7 · Open on DailyMed

  • Moderatetricyclic antidepressantsclass named in the label
    «DRUG INTERACTIONS: • MAO inhibitors, tricyclic antidepressants and drugs that prolong QTc interval may potentiate effect on the cardiovascular system. Use with extreme caution. ( 7.4 )»

    FDA, section 7 · Open on DailyMed

From other drugs’ labels

  • Roflumilast
    «No se han observado interacciones con salbutamol, formoterol y budesónida por vía inhalada, ni con montelukast, digoxina, warfarina, sildenafilo y midazolam por vía oral.»

    AEMPS, section 4.5 · Open on CIMA

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Frequently asked

What is Formoterol used for?

Formoterol is evaluated for the following indications with varying evidence strength: Asthma (evidence tier A), Chronic obstructive pulmonary disease (evidence tier A), Athletic endurance (evidence tier F). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Formoterol?

Common side effects of Formoterol (≥ 1 in 100): Tremor, Headache, Palpitations, Throat irritation, Muscle cramps. See the Safety section for uncommon and serious reactions.

Is Formoterol safe during pregnancy?

AEMPS summary of product characteristics (section 4.6): there are no adequate well-controlled studies in pregnant women, and data on formoterol in pregnancy are limited. In animal studies, formoterol caused implantation losses and reduced postnatal survival and birth weight. Formoterol is used during pregnancy only if the expected benefit justifies the potential risk to the fetus. Like other beta-2 agonists, it may inhibit labour by relaxing uterine smooth muscle.

Is Formoterol compatible with breastfeeding?

Compatible. Hale L2. Inhaled systemic bioavailability is low; only minimal amounts reach milk.

Who should not take Formoterol?

Formoterol is contraindicated in: Hypersensitivity to formoterol or excipients; Monotherapy for asthma without inhaled corticosteroid; Tachyarrhythmias. Full list in the Safety section.

Does Formoterol carry an FDA boxed warning?

Long-acting beta2-agonists (LABA), including formoterol, increase the risk of asthma-related death when used as monotherapy without an inhaled corticosteroid. In asthma formoterol is used only in fixed combination with an ICS. FDA Black Box 2010, AEMPS issued a parallel warning.

Official sources

Direct links to regulator labels. Open in a new tab.

Other drugs in this group

Ipratropium bromide, Mometasone, Montelukast, Roflumilast, Salmeterol, Tiotropium, Budesonide, Salbutamol (Albuterol)