Levalbuterol: what it treats, how to take it, side effects
Last updated September 3, 2026.
Levalbuterol (brand name Xopenex) is a short-acting bronchodilator that quickly opens narrowed airways. It is the active half of the albuterol molecule, used by nebulizer or inhaler for asthma and other reversible airway disease.
What does it treat?
It treats and prevents bronchospasm: the sudden tightening of airways that causes wheezing, chest tightness, and shortness of breath in asthma and COPD. It is a rescue medicine, working within minutes. It does not control the underlying inflammation, so frequent need for it is a signal that controller therapy needs attention.
How do you take it?
The nebulizer solution for adults and adolescents 12 and up is 0.63 mg three times a day, every 6 to 8 hours, with 1.25 mg three times daily as the maximum; children 6 to 11 use 0.31 mg three times daily. The inhaler is typically 2 puffs every 4 to 6 hours. Use it exactly as prescribed: more is not better, because overuse strains the heart and signals worsening disease. If you miss a scheduled dose, take it when remembered unless the next dose is close, and never double up. Needing it more often than prescribed means call your doctor, not up the dose.
Side effects to know
- Common: fast heartbeat, tremor, nervousness, headache, dizziness, and sore throat.
- Serious: paradoxical bronchospasm (breathing that tightens right after a dose; stop the drug and treat it as an emergency), significant heart rhythm effects, low potassium, and worsening of heart disease in susceptible patients.
Who should not take it?
Do not use it if you have had an allergic reaction to levalbuterol or to racemic albuterol. Use with care if you have heart disease, high blood pressure, an irregular heartbeat, seizures, diabetes, or an overactive thyroid. Beta blockers, MAO inhibitors, tricyclic antidepressants, some diuretics, and digoxin all interact. Discuss use in pregnancy with your doctor, since uncontrolled asthma itself carries risk.
When is it an emergency?
Call 911 if breathing gets worse right after a dose, if your lips or face swell, or if rescue doses stop working during an attack and you cannot speak in full sentences. Chest pain or a racing, irregular heartbeat after use also warrants emergency care. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
What is the difference between levalbuterol and albuterol?
Albuterol is a 50-50 mix of two mirror-image forms of the molecule; levalbuterol is the active half alone. The idea is similar relief with potentially fewer side effects like jitteriness in some patients. In practice both are short-acting rescue bronchodilators used the same way.
How fast does levalbuterol work?
Most people feel easier breathing within minutes of a nebulizer treatment or inhaler dose, with the peak effect around an hour and relief lasting several hours. If a dose does not relieve an attack, that is a warning sign, not a reason to keep stacking doses.
Is levalbuterol a steroid?
No. It is a beta-agonist bronchodilator that relaxes airway muscle within minutes. It contains no steroid and does nothing about airway inflammation, which is why many patients also need a separate daily inhaled corticosteroid for control.
Why does levalbuterol make my heart race?
It stimulates beta receptors, and some of that stimulation reaches the heart, causing a faster heartbeat, pounding, or tremor, especially at higher doses. Mild effects usually pass quickly; chest pain, severe palpitations, or faintness after a dose should be checked urgently.
Can I use levalbuterol every day?
Scheduled three-times-daily nebulizer use is a labeled regimen, so daily use as prescribed is fine. The danger sign is escalating use: needing it more often than prescribed, or waking at night to use it, means your underlying disease is not controlled and the plan needs changing.
Nebulizer or inhaler: which is better?
Both deliver the same drug effectively. Nebulizers are easier during severe attacks and for young children or anyone who struggles with inhaler technique. Inhalers are faster to use and portable. Your care team matches the device to your technique and situation.