Adult asthmatic (ages 18 to 75 years) with a history of moderate to severe persistent asthma are given minocycline capsules as add-on therapy for treatment of asthma. Treatment is for one year. Dosing begins at 150 mg twice daily and can increase every eight weeks by 50mg BID to a maximum of 250 mg twice daily. This is as per patient tolerance as minocycline can cause dizziness and stomach upset, as well as effects of liver enzymes.Patients undergo routine blood toxicity screens every two months, at which time spirometry is performed Exclusion criteria: pregnant women (adequate contraception in mandated) previous history of hypersensitivity to tetracyclines, chronic liver disease Outcome measures: improvement in FEV1 and other spirometric parameters, decrease in oral steroid requirements, change in total serum IgE, improvement in quality of life
