Just finished azithromycin for sinus infection 2 days ago. I was better for a few days, but now I am very stuffed up/congested again. What now?

Viral Cause? If you have already been started on antibiotics, and are not receiving any benefit, you may have a virus. Try tylenol (acetaminophen) and Ibuprofen for aches and pains, salt water gargles for sore throat, honey as a good cough medication, and a decongestant like Pseudoephedrine to improve symptoms.