Symbicort 160 Turbuhaler is a maintenance inhaler designed for regular use to control asthma and COPD symptoms over time. It combines budesonide and formoterol to reduce inflammation and provide long-lasting bronchodilation. In contrast, a rescue inhaler works quickly to relieve sudden breathing difficulty. Symbicort is not intended for immediate relief during an acute asthma attack but helps prevent such episodes when used consistently under medical guidance.