Salbutamol

Key facts

• Salbutamol (sold as Ventolin, among other brands) is a short-acting beta-2 agonist. It relaxes the muscles around your airways within minutes, making it the standard reliever for sudden breathlessness or wheeze.
• One or two puffs relieve symptoms quickly; the effect lasts about 4 to 6 hours.
• Needing your reliever inhaler more than 2 to 3 times a week, or more often than usual, is a warning sign that your asthma is not controlled and needs medical review, not just more salbutamol.
• Seek urgent care if a reliever inhaler no longer helps your breathing, or if you need it every few hours.

What salbutamol treats

Salbutamol relieves the sudden wheeze, breathlessness and chest tightness of an asthma attack, and eases acute breathlessness in chronic obstructive pulmonary disease (COPD). It is also used just before exercise to prevent exercise-induced bronchospasm. It works within minutes but wears off after a few hours, so it treats symptoms as they happen rather than controlling the underlying inflammation.

How salbutamol works

During an asthma or COPD flare, the muscles wrapped around your airways tighten and narrow the space for air to pass through. Salbutamol stimulates beta-2 receptors on these muscles, telling them to relax. The airways widen within minutes, making breathing easier, though the effect fades over several hours as the drug clears from the lungs.

Before you take it

• Tell your prescriber if you have a heart rhythm disorder, uncontrolled high blood pressure, an overactive thyroid, or diabetes, since salbutamol can affect heart rate and blood sugar.
• Other medicines that stimulate the heart, certain antidepressants, and some diuretics can increase side effects such as tremor or low potassium.
• If you use a preventer inhaler (an inhaled corticosteroid), keep taking it as prescribed. Salbutamol treats symptoms; it does not replace daily preventer treatment.

Side effects

Common effects include a fine tremor, a fast heartbeat, headache, and feeling jittery or nervous.

Stop and seek urgent medical care for any of these:

• Chest pain, or a fast, irregular heartbeat that does not settle.
• Severe shortness of breath that gets worse despite using your inhaler.
• Swelling of the face, lips, tongue or throat.

Safety essentials

• Using your reliever inhaler more than a few times a week is a sign your asthma is worsening and needs medical review. Rising use before an attack is a recognized warning sign of a life-threatening flare-up.
• High or frequent doses can cause tremor and lower your blood potassium level, which can affect the heart. This risk is greater if you also take diuretics or steroids.
• Always carry your reliever inhaler and check it is not empty. If it stops working as well as usual, contact your doctor rather than increasing the dose on your own.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.