First and foremost, he should stop smoking if he is a smoker. He has severe restriction of his lung capacity thus he should take inhalers like seroflo, asthalin
and tiatropium regularly besides AB phylline. During exacerbations of symptoms a short course of antibiotics and oral steroids
will help. Deep breathing exercises and chest physiotherapy
will also benefit him greatly. He may require domiciliary oxygen therapy
or a machine called CPAP/BIPAP to ease his breathing.