my asthma felt anything but normal. a blood test helped show my asthma is driven by eosinophils, which nucala helps reduce. nucala is a once-monthly add-on injection for severe eosinophilic asthma. nucala is not for sudden breathing problems. allergic reactions can occur. get help right away for swelling of face, mouth, tongue, or trouble breathing. infections that can cause shingles have occurred. don't stop steroids unless told by your doctor. tell your doctor if you have a parasitic infection. may cause headache, injection site reactions, back pain, and fatigue. ask your asthma specialist about a nunormal with nucala.