MODEL RELEASED. Asthma inhaler. Young girl holding a Seretide inhaler used to treat asthma. The trigger is seen at upper left, while the inhaler mouthpiece is at centre. Seretide inhalers are not designed to treat serious bouts of asthma, but deliver a steroid drug that reduces inflammation in the lungs and reduces the chance of a serious asthma attack. It can also relieve minor wheezing, as it combines both preventative and reliever aspects of an inhaler. More serious asthma attacks still require a separate inhaler. Seretide is manufactured by GlaxoSmithKline, and is available in three strengths: Seretide 100, Seretide 250, and Seretide 500. This is Seretide 100.