It is recommended for the treatment of infections in adults (over the age of 18) brought on by susceptible strains of the specified microorganisms under the following circumstances:Moraxella catarrhalis, Haemophilus influenzae, or Streptococcus pneumoniae can all cause acute bacterial sinusitis. Acute Bacterial Exacerbation of Chronic Bronchitis brought on by Moraxella catarrhalis, methicillin-susceptible Staphylococcus aureus, Haemophilus influenzae, Haemophilus parainfluenzae, Klebsiella pneumoniae, or Streptococcus pneumoniae.Streptococcus pneumoniae is the cause of community-acquired pneumonia.