The prescription antibiotic Zithromax must be used for any of the treatment of various common infections, which can include bacterial infections and sexually transmitted disease. By decreasing bacteria's ability to make protein and affecting peptide activity, the medicine can really help stop bacteria from continuing to reside in and cause infection in the human body. Zithromax can be chosen in either tablet form or in to a liquid suspension and is also licensed for use in both young and old.