MARLBOROUGH, Mass.--(BUSINESS WIRE)--Sepracor Inc. (Nasdaq: SEPR) today announced that ALVESCO HFA Inhalation Aerosol MDI (metered-dose inhaler) is now available by prescription in the U.S. ALVESCO HFA is a new inhaled corticosteroid indicated for maintenance treatment of asthma as prophylactic therapy in adult and adolescent patients 12 years of age and older. This asthma treatment is available in 80 mcg/actuation and 160 mcg/actuation dosage strengths.