Drug interactions
Penbutolol + Pirbuterol
Severity: Major
Penbutolol and Pirbuterol: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Penbutolol is a nonselective beta-blocker that blocks the bronchodilator action of pirbuterol. In patients with asthma or COPD this may reduce the response to the rescue inhaler and provoke bronchospasm.
What this interaction means in plain words
Penbutolol and Pirbuterol can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Pharmacodynamic antagonism at beta-2 adrenergic receptors.
What to do
Avoid nonselective beta-blockers in patients who need beta-agonists for reversible airway disease. If a beta-blocker is essential, use a cardioselective agent at the lowest dose and monitor respiratory function.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Frequently asked questions
Can I take Penbutolol with Pirbuterol?
MediHelp rates the interaction as major. Penbutolol and Pirbuterol can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Penbutolol is a nonselective beta-blocker that blocks the bronchodilator action of pirbuterol. In patients with asthma or COPD this may reduce the response to the rescue inhaler and provoke bronchospasm.
How serious is the interaction between Penbutolol and Pirbuterol?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid nonselective beta-blockers in patients who need beta-agonists for reversible airway disease. If a beta-blocker is essential, use a cardioselective agent at the lowest dose and monitor respiratory function.
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