Similarities and Differences of Biological Therapies for Severe Asthma.

The use of biologicals to treat severe asthma has been implemented in a regular basis while information on long term effectiveness and safety is lacking. It is necessary to establish strategies to closely monitor the possible occurrence of reactions, adverse effects of innovative biological medicines used to treat severe asthma. In this study the investigators want to evaluate the comparative effectiveness, utilization patterns, long-term safety, and use in special groups in real-life conditions in severe asthma.