FDA has approved Joenja (leniolisib) tablets as the first treatment for activated phosphoinositide 3-kinase delta syndrome (APDS) in children 4-11 years who weigh at least 27 kg. Joenja was first approved in 2023 for the same indication in patients 12 years and older at a dose of 70 mg orally twice a day. Children 4-11 years take a weight-based dosage (40, 50, or 70 mg) orally twice a day, approximately 12 hours apart.