Although the exact time it takes for azithromycin to cure an infection varies, most patients notice an improvement in symptoms after taking the medication for a few days, states MedlinePlus. Even if patients feel better, they should finish the medication exactly as prescribed to ensure the infection is completely gone.
Patients should contact a doctor if their symptoms worsen or do not improve after a few days of treatment with azithromycin, according to MedlinePlus. Azithromycin is an antibiotic used to treat bacterial infections, including pneumonia, bronchitis, other infections involving the ears, lungs, sinuses, skin or throat. The medication sometimes causes side effects, such as nausea, vomiting, stomach pain, diarrhea and headache.