Azithromycin Pregnancy and Breastfeeding Warnings. Azithromycin is also known as: Azithromycin Dose Pack, Z-Pak, Zithromax, Zmax Medically reviewed by Drugs.com. Last updated on Apr 22, 2021. Pregnancy Warnings Amoxicillin (Moxatag) vs. azithromycin (Zithromax) are antibiotics used to treat bacterial infections of the middle ear, tonsils, throat, larynx (laryngitis), bronchi (bronchitis), lungs (pneumonia), urinary tract, skin, and some sexually transmitted diseases. Amoxicillin and azithromycin are different types of antibiotics. Azithromycin has been shown to be active in vitro against Zika and Ebola viruses , , and to prevent severe respiratory tract infections when administrated to patients suffering from viral infection. This finding should be further explored to know whether a combination is more effective especially in severe cases. Speculated potential risk of severe QT prolongation induced by the association. Azithromycin is predicted to increase the exposure to relugolix. Manufacturer advises avoid or take relugolix first and separate administration by at least 6 hours.