Zithromax (azithromycin) can be recommended for patients with any of the numerous bacterial infections. This drug slows down the growth of bacteria and makes it possible for your immune system to finish it off. Zithromax is FDA pregnancy category B, which means this medicine is not expected to harm an unborn child if taken by a pregnant woman. However, it is not known whether this medicine passes into breast milk, so there is a chance it may harm a nursing infant. You should not breastfeeding if you need to take Zithromax and discuss everything with your doctor in advance. Tell your health care provider if you are taking any medications that have been reported to interact with Zithromax, such as digoxin, medications that suppress the immune system, ergotamine, anticoagulants, cyclosporine, nelfinavir, phenytoin, or terfenadine. Your doctor is suppose to know if you have any medical conditions that may potentially require a dose adjustment, the examples being liver disease, myasthenia gravis, a history of Long QT syndrome, heart rhythm disorder, or kidney disease. Zithromax should be taken for as long as prescribed and any expired medicine should be disposed of.