Foster nexthaler 100Mcg/6Mcg powder - fostair nexthaler is a powder that is inhaled through your mouth and delivered deeply into your lungs. It contains two active ingredients: beclometasone dipropionate anhydrous and formoterol fumarate dihydrate. ^ beclometasone dipropionate belongs to a group of medicines called corticosteroids which have an anti-Inflammatory action reducing the swelling and irritation in your lungs. Formoterol fumarate dihydrate belongs to a group of medicines called long-Acting bronchodilators. These relax the muscles in your airways, widening the airways so that it is easier for you to breathe air in and out of your lungs. these two active substances make breathing easier by providing relief from symptoms such as shortness of breath, wheezing and coughing in patients with asthma or copd and also help to prevent asthma symptoms.