What is the appropriate management for acute tonsillitis?

Management of Acute Tonsillitis

For acute tonsillitis, first determine the likelihood of Group A Streptococcus (GAS) using clinical scoring, then treat confirmed bacterial cases with penicillin or amoxicillin for 10 days while providing symptomatic relief with NSAIDs or acetaminophen for all patients. 1

Diagnostic Approach

Use the Centor or McIsaac scoring system to estimate the probability of GAS infection:

• If the score is ≥3, obtain a rapid antigen detection test (RADT) or throat culture to confirm GAS before initiating antibiotics 2, 3
• The Centor criteria include: tonsillar exudates, tender anterior cervical lymphadenopathy, fever, and absence of cough 4
• Routine blood tests (CBC, CRP, procalcitonin) are NOT indicated for uncomplicated acute tonsillitis as they do not change management 2, 5

Important caveat: Most acute tonsillitis is viral (70% of cases), making accurate bacterial identification crucial to avoid unnecessary antibiotic use 6, 7

Antibiotic Therapy (for Confirmed GAS)

First-line treatment for patients without penicillin allergy:

• Penicillin V oral: Children 250 mg 2-3 times daily; adolescents/adults 250 mg 4 times daily or 500 mg twice daily for 10 days 1
• Amoxicillin oral: 50 mg/kg once daily (max 1000 mg) OR 25 mg/kg twice daily (max 500 mg per dose) for 10 days 1
• Benzathine penicillin G IM: Single dose of 600,000 units if <27 kg or 1,200,000 units if ≥27 kg 1

For penicillin-allergic patients:

• First choice: Cephalexin 20 mg/kg/dose twice daily (max 500 mg/dose) for 10 days OR Cefadroxil 30 mg/kg once daily (max 1 g) for 10 days (avoid in immediate-type hypersensitivity) 1, 2
• Alternative: Clindamycin 7 mg/kg/dose 3 times daily (max 300 mg/dose) for 10 days 1
• Macrolides (azithromycin, clarithromycin): Use only when other options unavailable due to geographic resistance patterns 1, 2

Critical point: The full 10-day course is essential to prevent acute rheumatic fever and suppurative complications, despite symptom resolution occurring earlier 1, 2, 7

Symptomatic Management

Analgesia for all patients:

• Ibuprofen or paracetamol (acetaminophen) are recommended as first-line analgesics 1, 4
• Use caution with codeine in pediatric populations 4

Corticosteroids (adjunctive therapy):

• Consider a single dose of corticosteroids in conjunction with antibiotics for adults with severe presentations (Centor score 3-4) 1, 4
• Evidence shows benefit in severe cases but NOT routinely recommended for all patients 1
• No significant benefit demonstrated in children 1

When NOT to Treat with Antibiotics

Do not prescribe antibiotics for:

• Low-risk patients (Centor/McIsaac score <3) without confirmatory testing 2, 5
• GAS carriers (positive test without acute symptoms), as they are unlikely to spread infection or develop complications 1
• Prevention of acute glomerulonephritis (antibiotics do not prevent this complication) 5

"Delayed antibiotic prescription" strategy: In ambiguous cases, provide a prescription with instructions to fill only if symptoms worsen or persist beyond 2-3 days—this approach is highly effective in reducing unnecessary antibiotic use 5

Follow-up and Additional Testing

After treatment, do NOT routinely perform:

• Repeat throat swabs or cultures 2
• Blood tests, urinalysis, or ECG 2
• Antistreptolysin O (ASO) titers or other antistreptococcal antibody testing (these have no value in acute management) 2

Surgical Considerations

Tonsillectomy is NOT recommended solely to reduce the frequency of GAS pharyngitis 1

However, tonsillectomy is indicated for recurrent acute tonsillitis meeting Paradise criteria:

• ≥7 adequately treated episodes in the preceding year, OR
• ≥5 episodes in each of the preceding 2 years, OR
• ≥3 episodes in each of the preceding 3 years 3, 8

The NATTINA trial demonstrated that immediate tonsillectomy in adults with recurrent acute tonsillitis significantly reduced sore throat days (median 23 vs 30 days over 24 months) compared to conservative management, with an incident rate ratio of 0.53 (p<0.0001) 8

Key Clinical Pitfalls to Avoid

• Do not use exudative tonsillitis alone as an indication for antibiotics in children—it is not sufficiently specific for streptococcal etiology 5
• Do not prescribe macrolides as first-line therapy due to increasing resistance 1, 2
• Do not shorten antibiotic courses to less than 10 days for standard oral therapy, as this increases recurrence risk 2, 3
• Do not admit patients routinely—trial medical therapy in the emergency department or clinic first, as this reduces admission rates without compromising outcomes 4