This study will include patients with chronic obstructive pulmonary disease (COPD) who present with an acute exacerbation. Participants will be randomly assigned to receive either doxycycline or levofloxacin for 5 days. The aim is to compare how effective each antibiotic is in improving symptoms after 2 days of treatment.

This randomized controlled trial will evaluate the effectiveness of two antibiotics-doxycycline (a tetracycline) and levofloxacin (a fluoroquinolone)-in the treatment of acute exacerbations of chronic obstructive pulmonary disease. Participants will be assigned to one of the two treatment groups and will receive either doxycycline 100 mg twice daily or levofloxacin 500 mg once daily for 5 days. The primary outcome is clinical cure. This will be evaluated 2 days after completion of antibiotic therapy, based on symptom resolution and laboratory markers.

Inclusion Criteria:

• diagnosed cases of COPD Exacerbation of COPD Able to provide Written consent No anti biotic taken with in past 4 weeks

Exclusion Criteria:

• hypersensitivity to any drugs Pneumonia evidence on xray/ hrct chest Any other pulmonary condition e.g asthma Pregnancy/breast feeding Taking treatment for other active infections