The common cold is usually a viral infection, which means antibiotics like Azivista 250 (azithromycin) will not provide relief. For a cough that disrupts your sleep, a nighttime cough formula containing a cough suppressant like dextromethorphan, along with an antihistamine, is often more effective. Additionally, using saline nasal sprays and steam inhalation can ease congestion. Since you have felt no improvement after three days, I highly recommend consulting your doctor. They can examine you to rule out any secondary bacterial infection and prescribe the safest, most effective alternative to help you rest and recover.