Your doctor will tell you how often you need to use your inhaler. It’s important that you take the lowest dose needed to effectively control your asthma. The effect of this medicine may be noticeable after a few days but will only reach its maximum after a few weeks. This medicine must be used regularly to be effective, so go on taking it even if you don't have any symptoms. That means it’s doing its job. If you stop taking it your asthma and COPD may get worse. It should not be used to relieve sudden asthma attacks. If an asthma attack occurs, use your quick-relief inhaler (reliever). To get the benefit from this medicine you need to make sure you get your inhaler technique right, otherwise, it Does not work as well.