The brand name drug Zithromax Z-Pak is known to treat a broad range of bacterial infections, including sinus infections. This medication has the generic name azithromycin, notes WebMD.
The active ingredient azithromycin is a macrolide-type of anti-biotic that functions by inhibiting the growth of pathogenic bacteria. Zithromax Z-Pak, which is taken orally, is not effective in treating sinus infections that are viral in origin.
Some of the medical conditions that are treatable with Zithromax Z-Pak include severe sinusitis caused by Streptococcus pneumoniae, severe sinusitis caused by Moraxella catarrhalis and severe sinusitis caused by Haemophilus influenzae, states WebMD. Patients taking this medication should follow the full prescription course and dosage strength to derive the drug's maximum efficacy.