Serevent Inhaler

Serevent contains salmeterol, a long-acting beta-2 agonist (LABA) bronchodilator. It opens up the airways for around 12 hours per dose. In asthma it's used as an add-on to a steroid preventer when symptoms aren't controlled by the preventer alone. In COPD it's used alongside o

Salmeterol relaxes the muscle around the airways, much like salbutamol does, but with a much longer duration of action — about 12 hours rather than four to six. The trade-off is that it's slow to start: the bronchodilator effect builds over around 30 minutes after dosing.

This is the single most important thing to know about Serevent. Studies in the early 2000s showed that using a long-acting bronchodilator on its own in asthma — without a steroid preventer alongside — was associated with an increased risk of severe asthma attacks and asthma deaths. A bronchodilator on its own treats the symptom (airway tightness) without doing anything about the underlying inflammation, and that combination can mask worsening disease until something tips it over the edge. As a result, current guidance is unambiguous: Serevent must be used in combination with an inhaled corticosteroid in asthma, and many prescribers now favour combination inhalers (such as Seretide or Symbicort) precisely so that the two doses can never be separated.

Neither, exactly. It's a long-acting bronchodilator used as an add-on to a preventer. It isn't fast enough to relieve a sudden attack — that's still the job of Ventolin or another short-acting reliever — and it doesn't treat inflammation, so it's not a preventer either.

Onset is around 30 minutes; duration is about 12 hours. It's taken twice a day, morning and evening, regardless of symptoms.

No — and this is critical. In an attack, you need a fast-acting reliever like Ventolin or Bricanyl. Serevent is too slow to take effect when you're acutely unwell, and its long duration means double-dosing in a panic isn't safe. Your asthma action plan should always specify your fast-acting reliever as the medicine for sudden symptoms.

Tremor, headache, palpitations, throat irritation, and muscle cramps are the most commonly reported. As with all beta-2 agonists, persistent or worsening palpitations or chest discomfort are worth reviewing with a clinician.

Don't stop it on your own. Stopping a LABA can unmask poorly controlled inflammation, particularly if your asthma was relying on the combination to stay stable. Any change should be guided by a clinician, often with a step-down plan that adjusts the steroid dose as the LABA is reduced.

Serevent is licensed in children from age four onwards in the UK, used alongside a preventer. In pregnancy, salmeterol has been used where benefits outweigh risks, with the same reassuring framing as for other inhaled asthma medicines. Always discuss with your own GP or clinician before starting and stopping any asthma treatments.