Schering-Plough Corp. has received FDA approval for Asmanex Twisthaler, 110 micrograms, as a preventive therapy for asthma in kids between 4 and 11 years of age. This treatment is the first once-daily inhaler that can be used for treating children as young as 4. The FDA had approved Asmanex 220 micrograms on March 31, 2005, for preventing asthma flare-ups in patients who are 12 years or older.