What is the recommended management for acute rhinosinusitis?

Management of Acute Rhinosinusitis

For acute rhinosinusitis, distinguish viral from bacterial disease and reserve antibiotics for bacterial cases, using amoxicillin (with or without clavulanate) as first-line therapy, while offering symptomatic relief with saline irrigation, intranasal corticosteroids, and analgesics for all patients. 1, 2

Diagnostic Approach: Distinguishing Viral from Bacterial Disease

The critical first step is determining whether acute rhinosinusitis is viral or bacterial, as this fundamentally changes management 1, 3:

Diagnose acute bacterial rhinosinusitis (ABRS) when:

• Symptoms persist ≥10 days without improvement (purulent nasal discharge with nasal obstruction and/or facial pain-pressure-fullness) 1, 3, 4
• Symptoms worsen within 10 days after initial improvement ("double worsening") 1, 3
• Severe symptoms present for ≥3 days including purulent nasal discharge AND fever >102°F (39°C) 4

Most cases are viral rhinosinusitis associated with the common cold and do not require antibiotics 5, 4. The 10-day threshold is crucial—symptoms before this are presumed viral unless severe features are present 1.

Management Algorithm

For Viral Rhinosinusitis (Symptoms <10 days, no severe features):

Symptomatic treatment only—no antibiotics 1, 5:

• Saline nasal irrigation (physiologic or hypertonic solution) 1
• Analgesics for pain control based on severity 1
• Intranasal corticosteroids as an option for symptom relief 1

Avoid antihistamines and decongestants—neither topical nor oral formulations are recommended as they lack proven efficacy 1.

For Acute Bacterial Rhinosinusitis:

Initial Management: Watchful Waiting vs. Antibiotics

The 2025 guideline update extends watchful waiting as an option to all patients with uncomplicated ABRS regardless of severity, not just those with mild illness 2, 6. However, this requires assured follow-up 3.

Prescribe antibiotics when:

• Patient has severe symptoms (high fever, severe pain) 4
• Symptoms fail to improve after 7 days 1, 3
• Patient preference after shared decision-making 1

Antibiotic Selection:

First-line: Amoxicillin with or without clavulanate 2, 4

• The 2025 update changed from amoxicillin alone to include amoxicillin-clavulanate as first-line 2
• Amoxicillin alone remains equally effective for most patients without risk factors 4

Duration:

• Adults: 5-7 days for uncomplicated ABRS 1
• Children: 10-14 days 1

For beta-lactam allergy:

• Doxycycline or respiratory fluoroquinolone 4
• Clindamycin plus third-generation cephalosporin for children with non-type I hypersensitivity 4

Adjunctive Therapy for ABRS:

Recommended:

• Intranasal corticosteroids as adjunct to antibiotics, especially in patients with allergic rhinitis history 1
• Saline irrigation 1
• Analgesics based on pain severity 1

Not recommended:

• Oral or topical decongestants 1
• Antihistamines 1
• Oral corticosteroids as monotherapy (limited evidence when combined with antibiotics) 1

Reassessment and Treatment Failure

Switch management strategy if:

• Symptoms worsen after 48-72 hours of antibiotic therapy 1
• No improvement after 3-5 days of antibiotic therapy 1

At reassessment:

• Confirm ABRS diagnosis 3
• Exclude alternative diagnoses and complications 3
• Consider culture via direct sinus aspiration or endoscopically-guided middle meatus sampling (adults only)—nasopharyngeal swabs are unreliable 1

Imaging Considerations

Do not obtain imaging for uncomplicated acute rhinosinusitis 1, 5, 3. Radiographic imaging is not recommended for routine evaluation 5.

Obtain contrast-enhanced CT (axial and coronal views) when:

• Suppurative complications suspected (orbital or intracranial extension) 1
• Alternative diagnosis considered 1

Specialist Referral Indications

Refer to otolaryngology, infectious disease, or allergy when: 1

• Patient is seriously ill or immunocompromised
• Clinical deterioration despite extended antibiotic courses
• Recurrent acute rhinosinusitis with clearing between episodes

Common Pitfalls to Avoid

• Prescribing antibiotics for viral rhinosinusitis before 10 days—this accounts for 75% of inappropriate antibiotic prescriptions in primary care 4
• Using nasopharyngeal cultures for diagnosis—these are unreliable and strongly not recommended 1
• Ordering routine imaging—this adds cost without improving outcomes in uncomplicated cases 1, 5
• Prescribing antihistamines or decongestants—strong evidence against their use 1