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Salbutamol
Bronchodilator — Short-Acting Beta-2 Agonist (SABA)Nigerian brand names:VentolinSalbulinAsmalinAsthaventVolmax
Reviewed by the PMC Medical Team · Promise Medical Centre
Overview
Salbutamol (known as albuterol in North America) is a fast-acting bronchodilator — a medicine that quickly relaxes and opens the airways in the lungs. It works by stimulating beta-2 receptors in the smooth muscle of the bronchi, causing rapid relaxation and widening of narrowed airways. It acts within minutes and is the most important reliever medicine for asthma and wheezing in children and adults. In Nigeria, it is widely available as an inhaler (Ventolin) and as tablets or syrup — though the inhaler form is significantly more effective and safer.
Uses
Salbutamol is used to:
- Relieve acute asthma attacks (bronchospasm) — the primary use
- Prevent exercise-induced bronchospasm (taken before physical activity)
- Treat wheeze and breathlessness in chronic obstructive pulmonary disease (COPD)
- Relieve acute bronchospasm in children with recurrent wheezing
Inhaler vs. tablets:
- The inhaled form acts directly on the lungs within 5 minutes and has fewer systemic side effects — always prefer the inhaler
- Oral tablets are used when inhalers are not available or practical, but are less efficient and have more side effects
How to Use
Inhaler (most effective method):
Standard adult and child (over 5 years): 1–2 puffs (100 mcg per puff) every 4–6 hours as needed for symptoms.
How to use a metered-dose inhaler (MDI):
1. Shake the inhaler well for 5 seconds
2. Breathe out gently and completely
3. Place the mouthpiece in your mouth and form a seal with your lips
4. Begin to breathe in slowly and deeply — press the canister down once as you inhale
5. Continue to breathe in slowly for 3–5 seconds
6. Hold your breath for 10 seconds, then breathe out slowly
7. Wait 1 minute between puffs if a second puff is needed
A spacer device is strongly recommended, especially for children — it significantly improves drug delivery to the lungs.
Acute severe asthma: If symptoms are not improving after 4–6 puffs in 10 minutes, seek emergency medical care immediately.
Oral tablets (adults): 2–4 mg three to four times daily — only if inhaler unavailable.
Side Effects
Common side effects:
- Tremor (shaking hands) — especially with tablets or high doses
- Rapid heartbeat (tachycardia) or palpitations
- Headache
- Muscle cramps
- Nervousness or restlessness
- Low blood potassium (hypokalaemia) with high doses
These are more pronounced with oral tablets than with inhaler.
Serious — seek urgent help:
- Paradoxical bronchospasm: In rare cases, salbutamol can cause worsening wheeze immediately after use — stop and seek emergency care
- Very rapid or irregular heartbeat (arrhythmia)
- Chest pain (rare)
- Severe drop in potassium with high-dose nebulisation
Warnings & Precautions
Important warnings:
- Reliever only — not a preventer: Salbutamol relieves symptoms but does not reduce airway inflammation. People with persistent asthma also need a regular inhaled corticosteroid (preventer inhaler). Using only a reliever without a preventer in persistent asthma increases risk of a severe attack
- Overuse is a warning sign: If you are using your salbutamol inhaler more than 3 times per week for symptoms (not exercise prevention), your asthma is poorly controlled — see your doctor for a preventer inhaler
- Heart conditions: Use with caution in people with irregular heart rhythm, heart disease, or uncontrolled high blood pressure — salbutamol increases heart rate
- Hyperthyroidism: Use carefully in overactive thyroid conditions
- Diabetes: High doses may raise blood sugar — monitor blood glucose
- Potassium: High doses (especially in severe asthma managed with nebulisers) can lower potassium significantly — cardiac monitoring may be needed
Pregnancy and breastfeeding: Salbutamol is considered relatively safe in pregnancy when needed for asthma control — uncontrolled asthma poses greater risk to the baby than the medication. Discuss with your doctor.
Drug Interactions
Important interactions:
- Beta-blockers (atenolol, propranolol, metoprolol): Block the effect of salbutamol and can worsen asthma and wheeze — generally contraindicated in asthma. If a beta-blocker is necessary, use a cardioselective one with caution
- Other sympathomimetics (e.g., adrenaline/epinephrine): Additive cardiovascular effects — increased risk of arrhythmia
- Diuretics (furosemide, hydrochlorothiazide): Combined potassium-lowering effect — risk of hypokalaemia, which can affect the heart
- Corticosteroids (prednisolone, dexamethasone): Also lower potassium — potassium monitoring needed with high-dose salbutamol
- MAO inhibitors: Increased risk of cardiovascular side effects
- Digoxin: Low potassium from salbutamol can increase toxicity risk of digoxin — monitor potassium and digoxin levels
- Theophylline: Additive effects on heart rate and potassium lowering
Storage
Inhaler: Store below 30°C. Do not puncture, burn, or incinerate even when apparently empty. Protect from direct sunlight, frost, and extreme heat. The canister may burst if heated above 50°C.
Tablets/syrup: Store at room temperature (below 25°C), in a dry place. Keep out of reach of children.
Buy only NAFDAC-registered medications
Nigeria has a significant problem with counterfeit and substandard drugs. Always purchase medications from a licensed pharmacy and check the NAFDAC registration number on the package — verify at nafdac.gov.ng.