Do not use Zithromax if you have ever had an allergic reaction to azithromycin or similar drugs such as erythromycin (E-Mycin, Ery-Tab, E.E.S.), clarithromycin (Biaxin), telithromycin (Ketek), or troleandomycin (Tao).

If you have any of these conditions, you may need a dose adjustment or special tests to safely use Zithromax:

    *      liver disease;
    *      kidney disease;
    *      myasthenia gravis;
    *      a heart rhythm disorder; or
    *      a history of Long QT syndrome.

FDA pregnancy category B. Zithromax is not expected to be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment. It is not known whether azithromycin passes into breast milk or if it could harm a nursing baby. Do not take this medication without telling your doctor if you are breast-feeding a baby.