I have terrible chest congestion with a itchy cough in my lungs. i am on a z-pac. how long does it usually take to clear up?

Doctor can re-check: After starting antibiotics, things should be better each day after the first 2 days. Otherwise, the doctor can re-check to see if a different antibiotic or a longer course of antibiotics is needed. Sometimes asthma meds such as inhalers and anti-inflammatories like singulair (montelukast) or Prednisone are also needed. If doing well, a mild residual cough can be around for a couple of weeks, improving daily.