I have COPD stage-2 last 2 years. My age 55 years. Taking Inhaler and oxygen regularly. But no improvement. What should I do? Oxygen 2 ltrs/ mints for 15-16 hrs daily. Tiova Inhaler 2 puffs 2 times. Airtec FB 200 inhaler daily. Asthalin inhaler SOS. Doxolin tab twice.

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