Tonsillitis prescription
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Based on multiple authoritative textbooks, here is a comprehensive tonsillitis prescription guide:
Tonsillitis: Prescription Guide
1. Etiology — Treat the Cause First
| Type | Common Agents | Antibiotic Needed? |
|---|---|---|
| Viral (majority) | Adenovirus, EBV, rhinovirus, influenza, RSV | ❌ No |
| Bacterial (GABHS) | Group A β-hemolytic Streptococcus (S. pyogenes) | ✅ Yes |
Most sore throats are viral — antibiotics are indicated only after confirming bacterial cause (positive RADT or throat culture).
2. Diagnosis Before Prescribing
Rapid Antigen Detection Test (RADT)
- First-line test; if negative, confirm with throat culture (sensitivity 60–80%)
- Throat culture (5% sheep blood agar) = gold standard; 96% sensitivity
McIsaac Scoring (modified Centor criteria)
Score 1 point each for:
- Temp > 38°C
- No cough
- Tender anterior cervical lymphadenopathy
- Tonsillar swelling or exudate
- Age 3–14 years (subtract 1 point if age > 45)
| Score | GABHS Probability | Action |
|---|---|---|
| 0–1 | 2–6% | No treatment |
| 2–3 | 10–28% | RADT or throat culture |
| 4–5 | 38–63% | Treat empirically |
3. Antibiotic Treatment
First-Line (Drug of Choice)
Penicillin V (Pen VK) — No documented resistance in GABHS
- Children: 250 mg PO 2–3× daily × 10 days
- Adolescents & Adults: 500 mg PO 2× daily × 10 days
Amoxicillin — Comparable efficacy, preferred in children (better taste of suspension)
- 50 mg/kg/day divided twice daily (max 1000 mg/day) × 10 days
- Once-daily dosing: 750 mg–1 g PO QD × 10 days (adults)
Benzathine Penicillin G (IM) — Use when compliance is a concern or patient cannot swallow/is vomiting
- < 27 kg (< 60 lb): 600,000 U IM × single dose
- ≥ 27 kg (≥ 60 lb): 1.2 million U IM × single dose
- Mix with 300,000 U procaine penicillin to reduce injection pain
Penicillin-Allergic Patients
| Drug | Dose | Duration |
|---|---|---|
| Azithromycin | 12 mg/kg/day PO QD (max 500 mg) | 5 days |
| Clarithromycin | 15 mg/kg/day ÷ Q12h (max 1 g/day) | 10 days |
| Cephalexin (non-severe allergy) | 12.5 mg/kg or 500 mg PO BID | 10 days |
| Clindamycin | 20 mg/kg/day ÷ TID (max 450 mg/day) | 10 days |
| Erythromycin | 40 mg/kg/day ÷ 2–4 doses daily | 10 days |
⚠️ Macrolide resistance warning: 6–7% of GABHS in the US are macrolide-resistant (azithromycin/clarithromycin). If clinical failure occurs, switch to clindamycin.
Alternative Oral Cephalosporins
Cephalosporins show superior bacterial eradication compared to penicillin:
- Cefprozil, cefpodoxime, cefuroxime axetil, cefixime, ceftibuten, amoxicillin-clavulanate
4. Recurrent / Treatment Failure
- Recurrent GABHS (after penicillin failure): Switch to cephalexin 500 mg BID × 10 days
- GABHS carrier state (15% remain culture-positive after treatment): Clindamycin 20 mg/kg/day ÷ TID × 10 days (max 450 mg/day)
5. Symptomatic Relief
- NSAIDs (ibuprofen) or paracetamol/acetaminophen for fever and pain
- Adequate hydration
- Corticosteroids (single dose dexamethasone) may be added for severe pain/swelling
6. Tonsillectomy Indications (Recurrent Tonsillitis)
- ≥ 7 episodes in 1 year, OR
- ≥ 5 episodes/year for 2 consecutive years, OR
- ≥ 3 episodes/year for 3 consecutive years
7. Complications to Watch For
- Peritonsillar abscess — trismus, uvular deviation, muffled voice → drainage + IV antibiotics
- Acute rheumatic fever — treat GABHS promptly to prevent
- Post-streptococcal glomerulonephritis
- PFAPA syndrome (periodic fever + aphthous ulcers + pharyngitis + cervical adenitis) — treat each episode with corticosteroids; tonsillectomy may be curative
Recent evidence (2024–2025): An umbrella review in Lancet Infectious Diseases (PMID: 39243792) supports 5-day courses of antibiotics for pharyngitis/tonsillitis as equivalent to 10-day courses for some regimens — though 10 days remains the standard for penicillin VK.
Sources: Textbook of Family Medicine 9e, Tintinalli's Emergency Medicine, K.J. Lee's Essential Otolaryngology, Harriet Lane Handbook 23e, Cummings Otolaryngology
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