Treatment of Acute Bacterial Sinusitis

Diagnosis and Classification

Acute sinusitis is defined as symptoms and signs lasting less than 4 weeks, with diagnosis primarily based on clinical history and physical examination 3
Common clinical findings include purulent rhinorrhea, facial pain/pressure that worsens when bending forward, and nasal congestion 4, 5

The American Academy of Otolaryngology-Head and Neck Surgery recommends amoxicillin or amoxicillin-clavulanate as first-line choices for most patients 1, 2
Amoxicillin-clavulanate is recommended at a dose of 500-875 mg twice daily for adults, and 22.5-45 mg/kg twice daily for children (based on amoxicillin component) 1, 5
For regions with high bacterial resistance or for more severe cases, high-dose amoxicillin-clavulanate is recommended 6
Second-generation cephalosporins, such as cefuroxime axetil, and third-generation cephalosporins, such as cefpodoxime proxetil, are alternative options for penicillin-allergic patients 1, 5, 6
Macrolides, such as azithromycin, and respiratory fluoroquinolones, such as levofloxacin, are also alternative options 1, 5

The standard duration of antibiotic treatment is 10-14 days for most antibiotics 1, 3
Treatment should continue until the patient is symptom-free for 7 days 7

For mild acute bacterial sinusitis, the American Academy of Otolaryngology-Head and Neck Surgery recommends starting with amoxicillin or amoxicillin-clavulanate, and assessing response after 3-5 days 1, 4, 6
For moderate to severe sinusitis or recent antibiotic use, the American Academy of Otolaryngology-Head and Neck Surgery recommends starting with high-dose amoxicillin-clavulanate or respiratory fluoroquinolone 6

Intranasal corticosteroids may be helpful in both acute and chronic sinusitis, especially with marked mucosal edema 4
Decongestants and antihistamines may be beneficial in certain cases, but evidence is limited 7, 8

Chronic or recurrent sinusitis requires evaluation for underlying conditions such as allergies, immunodeficiency, or anatomical abnormalities 3
Frontal, ethmoidal, or sphenoidal sinusitis requires more aggressive treatment due to higher risk of complications 5
Complications such as orbital involvement or neurological symptoms require immediate hospitalization and parenteral antibiotics 5

If symptoms persist after 21-28 days of antibiotic treatment, consider broader-spectrum antibiotics, anaerobic coverage, CT imaging, and specialist referral 3