Amoxicillin-Clavulanate Dosing in Pediatric Patients

High-Dose Regimen

• High-dose amoxicillin-clavulanate is defined as 90 mg/kg/day of amoxicillin with 6.4 mg/kg/day of clavulanate in two divided doses for children, as recommended by the American Academy of Otolaryngology-Head and Neck Surgery 1, 2, 3
• The high-dose formulation provides a 14:1 ratio of amoxicillin to clavulanate in an oral suspension, according to the American Academy of Otolaryngology-Head and Neck Surgery 2, 3

Respiratory Tract Infections

• For β-lactamase producing H. influenzae, amoxicillin-clavulanate at 45 mg/kg/day in 3 doses or 90 mg/kg/day in 2 doses is recommended, as per the Infectious Diseases Society of America 4

Important Clinical Considerations

• Serum levels of amoxicillin increase linearly with the dose, and the difference in the incidence of adverse effects between lower and higher doses is generally negligible, as reported by the American Academy of Otolaryngology-Head and Neck Surgery 1, 2, 3
• Common adverse effects include diarrhea, nausea, vomiting, and rash, according to the American Academy of Dermatology 5

Amoxicillin-Clavulanic Acid Dosage for Pediatric Patients

Standard Dosing Regimens

• The American Academy of Pediatrics recommends a dosage of 45 mg/kg/day of the amoxicillin component divided into 3 doses or 90 mg/kg/day divided into 2 doses for β-lactamase producing organisms, with a maximum of 2 g per dose 6, 7

High-Dose Regimen

• The American Academy of Pediatrics recommends high-dose therapy for areas with high prevalence of penicillin-resistant Streptococcus pneumoniae (>10%) 8
• High-dose amoxicillin-clavulanate is defined as 90 mg/kg/day of amoxicillin with 6.4 mg/kg/day of clavulanate in two divided doses for children 9, 8

Duration of Therapy

• The Infectious Diseases Society of America recommends treatment courses of 10 days for most pediatric infections 10
• The American Academy of Pediatrics recommends continuing antibiotic therapy for 7 days after the patient becomes free of signs and symptoms 8

Pediatric Amoxicillin-Clavulanate Dosing

Specific Indications

• For presumed bacterial pneumonia in outpatient children under 5 years old, the American Academy of Pediatrics recommends amoxicillin-clavulanate with amoxicillin component at 90 mg/kg/day in 2 doses 11

Amoxicillin-Clavulanate Dosing Guidelines

Standard and High-Dose Regimens

• The American Academy of Pediatrics recommends a maximum single dose of 2 grams per dose regardless of weight 12
• High-dose amoxicillin-clavulanate (90 mg/kg/day amoxicillin with 6.4 mg/kg/day clavulanate in 2 divided doses) is indicated for children with specific risk factors, including age <2 years, daycare attendance, recent antibiotic use, and moderate to severe illness 12
• The high-dose formulation achieves middle ear fluid concentrations adequate to overcome penicillin-resistant S. pneumoniae based on acute otitis media data 12
• Using standard doses when high-dose therapy is indicated leads to treatment failure with resistant organisms 12

Amoxicillin-Clavulanate Dosing for Children with Specific Infection Risks

Dosing Considerations for High-Risk Infections

• For children with incomplete vaccination against Haemophilus influenzae type b (less than 3 injections), high-dose amoxicillin-clavulanate is indicated 13
• Children under 3 years with community-acquired pneumonia should start with amoxicillin alone at 80-100 mg/kg/day in 3 divided doses, with clavulanate added if necessary 13
• The treatment duration for bacterial pneumonia is 10 days 13
• Children with community-acquired pneumonia and incomplete H. influenzae type b vaccination or concurrent purulent otitis media should receive amoxicillin-clavulanate with 80 mg/kg/day amoxicillin component 13

Co-Amoxiclav Dosing in Pediatric Patients

Age-Based Oral Dosing Regimens

• For pediatric patients less than 1 year (1-12 months), the American Academy of Pediatrics recommends 2.5 ml three times daily of 125/31 suspension 14, 15, 16
• For pediatric patients 1-6 years, the American Academy of Pediatrics recommends 5 ml three times daily of 125/31 suspension 14, 15, 16
• For pediatric patients 7-12 years, the American Academy of Pediatrics recommends 5 ml three times daily of 250/62 suspension 14, 15, 16
• For pediatric patients 12-18 years, the American Academy of Pediatrics recommends 1 tablet (250/125) three times daily 15, 16

Intravenous Dosing

• For pediatric patients of all ages, the American Academy of Pediatrics recommends 30 mg/kg three times daily IV 14, 15, 16

Clinical Pharmacology Considerations

• High-dose amoxicillin (80-90 mg/kg/day) exceeds the minimum inhibitory concentration for intermediately resistant S. pneumoniae and many highly resistant serotypes, according to the Pediatric Infectious Diseases Society 17
• The 14:1 ratio formulation (90/6.4 mg/kg/day) causes less diarrhea than other amoxicillin-clavulanate preparations while maintaining efficacy, as reported by the American Academy of Pediatrics 17

Appropriate Co-Amoxiclav Dosing for URTI in Children

Standard Dosing Recommendations

• The recommended co-amoxiclav dosing for a 5-year-old child is 5 ml of 125/31 suspension three times daily, providing approximately 125mg of amoxicillin per dose, or 375mg total daily 18, 19, 20
• This dosing is substantially higher than an 80mg dose, which is grossly inadequate for a 5-year-old child with URTI 18, 19, 20

Critical Context: Most URTIs Don't Require Antibiotics

• The vast majority of URTIs are viral and do not benefit from antibiotics at all, according to the Rhinology society 21
• Before prescribing any antibiotic for URTI, ensure the child meets criteria for acute bacterial rhinosinusitis (ABRS), including persistent symptoms >10 days without improvement, severe symptoms, or "double sickening" 21

Evidence on Antibiotic Efficacy in Pediatric ABRS

• Two placebo-controlled trials in children with ABRS showed that amoxicillin-clavulanate 90 mg/kg with 6.4 mg/kg clavulanate had a 50% cure rate vs 14% with placebo, but 44% adverse events vs 14% 21
• A meta-analysis showed no significant benefit of antibiotics over placebo (RR 1.45, 95% CI not significant) 21

Clinical Consequences of Underdosing

• The American Academy of Pediatrics recommends against using subtherapeutic doses of antibiotics, as they fail to achieve adequate serum and tissue concentrations to overcome even susceptible organisms, and promote antimicrobial resistance 21
• Treatment failure with resistant organisms is inevitable when standard doses are not used, and there is an increased risk of complications from untreated or inadequately treated bacterial infection 21

Common Pitfalls to Avoid

• The American Academy of Pediatrics recommends verifying the suspension concentration (125/31 vs 250/62) before calculating volume, to avoid dosing errors 18, 19, 20
• Most URTIs are viral and resolve without antibiotics, and prescribing antibiotics for viral URTIs increases adverse effects without benefit, according to the Rhinology society 21

Appropriate Antibiotic Dosing for Pediatric URTI

Introduction to Antibiotic Dosing

• For a 5-year-old child weighing 18 kg with a bacterial URTI, the standard recommended dose is 5 ml of 125/31 suspension three times daily, providing approximately 125 mg of amoxicillin per dose, according to the British Infection Society/British Thoracic Society guidelines 22, 23, 24
• This dosing regimen provides a total daily dose of approximately 375 mg of amoxicillin or 21 mg/kg/day, as recommended by the British Infection Society/British Thoracic Society guidelines 22, 23

IV Therapy

• For severe infections requiring IV therapy, the recommended dose is 30 mg/kg three times daily IV, which for an 18 kg child would be 540 mg IV three times daily, based on guidelines from the British Infection Society/British Thoracic Society 22, 23, 24

Amoxicillin-Clavulanate Dosing in Pediatric Infections

Standard Dosing Regimens

• The American Academy of Pediatrics recommends 90 mg/kg/day of amoxicillin with 6.4 mg/kg/day of clavulanate in 2 divided doses for children, providing a 14:1 ratio of amoxicillin to clavulanate, which is the preferred high-dose regimen for most pediatric infections 25
• Outpatient children <5 years should receive 90 mg/kg/day of amoxicillin component in 2 doses, while outpatient children ≥5 years should receive 90 mg/kg/day in 2 doses (maximum 4000 mg/day) 25

Specific Clinical Indications

• For community-acquired pneumonia, the Infectious Diseases Society of America recommends treatment duration of 10 days for bacterial pneumonia, with a high-dose regimen of 90 mg/kg/day of amoxicillin component in 2 doses 25

Amoxicillin-Clavulanate Dosing for Pediatric Patients with Respiratory Tract Infections

Indication-Specific Dosing

• The American Academy of Otolaryngology-Head and Neck Surgery recommends a high-dose regimen of 90 mg/kg/day in 2 divided doses for children at risk of resistant organisms, with a duration of 10 days for most respiratory infections 26
• Clinical improvement is expected within 48-72 hours of starting therapy, and if no improvement or worsening occurs after 72 hours, reevaluation and consideration of switching antibiotics or further investigation is recommended, according to the American Academy of Otolaryngology-Head and Neck Surgery 26

Amoxicillin/Clavulanate Dosing for Lower Respiratory Tract Infections in Children

Patient Risk Factors and Dosing

• The American Academy of Pediatrics and the Infectious Diseases Society of America recommend using the high-dose regimen (90 mg/kg/day) if risk factors such as age <2 years, daycare attendance, recent antibiotic use, incomplete Haemophilus influenzae type b vaccination, or geographic area with high pneumococcal resistance are present 27
• The high-dose regimen (90 mg/kg/day) is also recommended for children with concurrent purulent acute otitis media or moderate to severe illness, although the evidence for this is not as strong 27

Treatment Duration and Monitoring

• The Infectious Diseases Society of America recommends continuing treatment for 10 days for bacterial pneumonia or lower respiratory tract infection 27
• Clinical improvement should be evident within 48-72 hours, and if no improvement or worsening occurs after 72 hours, reassess the diagnosis clinically and radiologically, consider atypical pathogens, and evaluate for complications or alternative diagnoses 27

Alternative Treatment Options

• For children under 3 years with community-acquired pneumonia and no risk factors for resistant organisms, amoxicillin alone at 80-100 mg/kg/day in three divided doses is preferred over amoxicillin/clavulanate, according to the American Academy of Pediatrics 27

Co-Amoxiclav Pediatric Dosing Guidelines

Indication-Specific Dosing

• The American Academy of Pediatrics recommends high-dose amoxicillin-clavulanate (90 mg/kg/day divided BID) as first-line therapy in children with acute bacterial rhinosinusitis, as it is strongly recommended for this indication 28
• For acute otitis media, the recommended duration of treatment is 10 days, with a high-dose regimen of 90 mg/kg/day divided BID for risk factors such as recent antibiotic use, incomplete Haemophilus influenzae type b vaccination, or geographic area with high pneumococcal resistance 28
• The Infectious Diseases Society of America recommends a treatment duration of 10-14 days for acute bacterial rhinosinusitis, with high-dose amoxicillin-clavulanate (90 mg/kg/day BID) as the preferred therapy 28

Amoxiclav Syrup Dosing Guidelines

Age-Based Dosing Algorithm

• For children 7-12 years, the American Academy of Pediatrics recommends 5 ml of 250/62 suspension three times daily, providing approximately 250mg of amoxicillin per dose, with a total daily dose of approximately 750mg amoxicillin 29, 30
• The dosing of amoxiclav syrup follows an age-based algorithm rather than strict weight-based calculations for standard infections, as recommended by the Infectious Diseases Society of America 29, 30

Critical Dosing Considerations

• The American Academy of Pediatrics recommends verifying the suspension concentration before dispensing, as the 250/62 formulation is specifically indicated for children over 6 years of age 29, 30

Intravenous Dosing for Severe Infections

• For severe infections, the Infectious Diseases Society of America recommends an IV dose of 30 mg/kg three times daily, which equals 660mg IV every 8 hours for a 22kg child 29, 30

Co-Amoxiclav Dosing Guidelines for Pediatric Patients

Dosing Recommendations

• The British Thoracic Society guidelines recommend that children aged 7-12 years should receive 5ml of 250/62 suspension three times daily for standard infections, however, the 457mg/5ml preparation can be used for twice-daily dosing 31
• The typical treatment duration is 7-10 days for most respiratory and soft tissue infections, though may extend to 14 days depending on clinical response, as suggested by the British Thoracic Society 31

High-Dose Therapy Indications

• High-dose co-amoxiclav (90 mg/kg/day) is indicated for patients with certain risk factors, including daycare attendance, as recommended by guidelines cited in Thorax 31

Dosing of Amoxicillin-Clavulanic Acid in Pediatric Patients

Ajuste en Insuficiencia Renal

• In patients with established renal insufficiency, prolonging the dosing interval according to creatinine clearance is essential to avoid accumulation, as recommended by the Clinical Infectious Diseases guideline 32
• The American Academy of Pediatrics suggests that for children with altered renal function, the dose should be significantly reduced due to the renal elimination of both amoxicilina and clavulanic acid 32

Amoxicillin-Clavulanate Dosing in Pediatric Patients with High-Risk Factors

Indications for High-Dose Therapy

• The American Academy of Otolaryngology-Head and Neck Surgery recommends high-dose amoxicillin-clavulanate as first-line for children with severe Acute Otitis Media (AOM), bilateral AOM in children 6-23 months, or those receiving amoxicillin in the previous 30 days, with a predicted clinical efficacy of 90-92% against penicillin-resistant S. pneumoniae 33
• High-dose regimen is indicated for pediatric patients under 2 years, with daycare attendance, recent antibiotic use within the previous 30 days, incomplete Haemophilus influenzae type b vaccination, or geographic area with high prevalence of penicillin-resistant S. pneumoniae (>10%), with a dosing regimen of 90 mg/kg/day divided into 2 doses 33

Specific Infection Types

Acute Otitis Media

• High-dose regimen: 90 mg/kg/day divided into 2 doses for 10 days is recommended for pediatric patients with AOM, especially those with severe disease or risk factors for resistant organisms, with a strength of evidence based on clinical guidelines from the American Academy of Otolaryngology-Head and Neck Surgery 33

Amoxicillin-Clavulanate Therapy in Infants

Indications and Dosage

• The American Academy of Otolaryngology-Head and Neck Surgery recommends amoxicillin-clavulanate for acute bacterial rhinosinusitis in infants, providing coverage against S. pneumoniae, H. influenzae, and M. catarrhalis 34, 35

Augmentin Dosing for Acute Otitis Media

Rationale for High-Dose Regimen

• Children under 2 years of age with Acute Otitis Media require antibiotic therapy and specifically warrant high-dose amoxicillin-clavulanate, as recommended by the American Academy of Pediatrics, with a high-dose formulation providing a 14:1 ratio that achieves middle ear fluid concentrations adequate to overcome penicillin-resistant Streptococcus pneumoniae and β-lactamase-producing Haemophilus influenzae and Moraxella catarrhalis 36

Treatment Efficacy

• The high-dose formulation (90/6.4 mg/kg/day) eradicated penicillin-resistant S. pneumoniae with MICs of 2-4 mg/L in clinical trials, with clinical response rates of 76-95%, according to the Infectious Diseases Society of America 36

Acute Otitis Media Treatment in Children

Indications and Dosage

• The American Academy of Pediatrics recommends high-dose amoxicillin-clavulanate for children under 2 years with acute otitis media, with a dosage of 90 mg/kg/day of amoxicillin and 6.4 mg/kg/day of clavulanate, divided into 2 doses 37
• Children below 2 years with AOM require antibiotic therapy and specifically warrant high-dose formulation, with treatment duration of 8-10 days 37

Adverse Effects and Tolerability

• Common adverse effects of high-dose amoxicillin-clavulanate include diarrhea (25% vs 15% placebo) and diaper dermatitis (51% vs 35% placebo), according to the American Academy of Pediatrics 38

Maximum Amoxicillin Dose for Pediatric Otitis Media

Weight-Based Calculation

• The American Academy of Pediatrics and American Academy of Family Physicians recommend a maximum dose of 90 mg/kg/day of amoxicillin for a child with otitis media, which equals 2,250 mg per day (1,125 mg twice daily) for a 25 kg child 39, 40
• The weight-based calculation for this patient requires 90 mg/kg/day × 25 kg = 2,250 mg total daily dose, administered as 1,125 mg twice daily (every 12 hours) 39, 40

Rationale for High-Dose Regimen

• The American Academy of Pediatrics and American Academy of Family Physicians guidelines explicitly recommend 80-90 mg/kg/day as the appropriate dose when amoxicillin is used for acute otitis media in children 39, 40

When to Use Amoxicillin-Clavulanate Instead

• Switch to amoxicillin-clavulanate (90 mg/kg/day of amoxicillin component with 6.4 mg/kg/day clavulanate) if the child has treatment failure after 48-72 hours on amoxicillin alone 39, 40
• The American Academy of Pediatrics and American Academy of Family Physicians recommend switching to amoxicillin-clavulanate in cases of severe illness at presentation, although the strength of this evidence is not specified 39

Treatment Duration and Monitoring

• The American Academy of Pediatrics and American Academy of Family Physicians recommend continuing treatment for 10 days for children under 6 years with acute otitis media 39, 40
• Reassess the patient at 48-72 hours if symptoms persist or worsen, as clinical improvement should be evident within the first 24-48 hours 39, 40

Amoxicillin Dosing for Ear Infection

Rationale for High-Dose Therapy and Alternative Treatments

• The American Academy of Otolaryngology-Head and Neck Surgery recommends switching to amoxicillin-clavulanate if the patient received antibiotics within the past 4-6 weeks 41

Treatment Duration and Monitoring

• No cited facts are available for this section

Practical Administration and Common Pitfalls to Avoid

• No cited facts are available for this section

High‑Dose Amoxicillin for Acute Otitis Media in Children < 2 Years

Rationale for High‑Dose Therapy

• High‑dose amoxicillin (80–90 mg/kg/day) attains middle‑ear fluid concentrations that reliably overcome penicillin‑resistant Streptococcus pneumoniae, the predominant bacterial pathogen in this age group. 42

Recommended Treatment Duration

• The American Academy of Pediatrics advises a 10‑day course of high‑dose amoxicillin for acute otitis media in children younger than 2 years. 42

Indications to Switch to Amoxicillin‑Clavulanate

• Consider amoxicillin‑clavulanate (90 mg/kg/day amoxicillin component + 6.4 mg/kg/day clavulanate) instead of amoxicillin alone when any of the following are present in a child < 2 years:

Expected Clinical Response and Monitoring

• Clinical signs (pain, fever, irritability) should begin to improve within 48–72 hours after initiating high‑dose amoxicillin. 42
• If no improvement or clinical worsening is observed after 48–72 hours, the regimen should be changed to amoxicillin‑clavulanate at the same high‑dose schedule. 42

Age‑Related Recommendations for Augmentin (Amoxicillin‑Clavulanate) Use in Children

Minimum Age for Initiation

• Augmentin may be initiated in children ≥ 3 months of age when a bacterial infection is suspected or confirmed. 43

Indications in Children ≥ 3 Months

• The primary indications for oral Augmentin in this age group are acute otitis media, community‑acquired pneumonia, and acute bacterial rhinosinusitis. 43, 44

Safety and Pharmacokinetic Evidence

• Safety and efficacy data are robust for children ≥ 3 months, but remain limited for infants younger than 3 months, leading to a recommendation against routine use in the latter group. 43
• Pharmacokinetic studies demonstrate reliable metabolism and clearance of the clavulanate component only after the neonatal period (≥ 3 months), supporting the age cutoff. 43
• Pathogen prevalence: The key bacterial pathogens causing acute otitis media (Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis) become markedly more common after 3 months of age, making antibiotic therapy more clinically relevant. 43

Recommendations for Infants < 3 Months

• For infants younger than 3 months with a suspected serious bacterial infection, intravenous regimens (e.g., ampicillin + gentamicin or cefotaxime) are preferred over oral Augmentin. 44
• If oral Augmentin is deemed absolutely necessary in a critically ill 1–2‑month‑old infant, specialist consultation should be obtained before prescribing. 43
• French pediatric guidelines explicitly limit acute otitis media recommendations to children over 3 months, reinforcing the age restriction. 43

Diagnostic Stewardship

• Oral Augmentin should not be prescribed for isolated tympanic membrane redness without bulging or effusion, as this finding alone does not meet criteria for bacterial otitis media. 43

High‑Dose Amoxicillin for Acute Otitis Media in Children

Recommended First‑Line Therapy

• The American Academy of Pediatrics recommends high‑dose amoxicillin (80–90 mg/kg/day divided twice daily) as the first‑line treatment for acute otitis media because it achieves middle‑ear fluid concentrations that exceed the minimum inhibitory concentrations of intermediately resistant Streptococcus pneumoniae (penicillin MIC 0.12–1.0 µg/mL) and many highly resistant serotypes (penicillin MIC ≥ 2 µg/mL). 45
• High‑dose amoxicillin provides superior bacteriologic and clinical efficacy compared with standard‑dose amoxicillin (40–45 mg/kg/day), with ≈ 87 % of S. pneumoniae isolates susceptible to high‑dose therapy versus 83 % to standard‑dose. 45

Dosing Calculations & Administration

• For a child weighing 21.7 kg, a dose of 90 mg/kg/day equals 1,950 mg total daily dose, administered as 975 mg every 12 hours (≈12 mL of a 400 mg/5 mL suspension). This calculation follows AAP dosing guidelines. 45, 46
• Administering the doses every 12 hours maintains therapeutic middle‑ear fluid concentrations throughout the dosing interval, optimizing bacterial eradication. 45

When to Switch to Amoxicillin‑Clavulanate

• Switch to high‑dose amoxicillin‑clavulanate (90 mg/kg/day amoxicillin + 6.4 mg/kg/day clavulanate, divided twice daily) if any of the following apply:
• The rationale for switching is that β‑lactamase‑producing Haemophilus influenzae (found in 58–82 % of isolates) and Moraxella catarrhalis are resistant to amoxicillin alone but susceptible to amoxicillin‑clavulanate. 45

Age-Based Alternative Dosing for Standard‑Strength Co‑amoxiclav Suspensions in Children

Dosage Recommendations by Age

• For infants 1–12 months old, give 2.5 ml per kilogram of the 125 mg/31 mg amoxicillin‑clavulanate suspension three times daily. 47
• For children 1–6 years old, administer 5 ml of the 125 mg/31 mg suspension three times daily. 47
• For children 7–12 years old, prescribe 5 ml of the 250 mg/62 mg suspension three times daily. 47

High‑Dose Amoxicillin‑Clavulanate for Acute Otitis Media in Children

Dosage Recommendations

• The American Academy of Otolaryngology‑Head and Neck Surgery recommends a high‑dose regimen of 90 mg/kg/day amoxicillin plus 6.4 mg/kg/day clavulanate, divided into two doses for acute otitis media. 48, 49

Indications for High‑Dose Therapy

• High‑dose amoxicillin‑clavulanate should be used as first‑line therapy when a child has recent antibiotic use within the past 30 days. 48, 49
• It is also indicated when there is concurrent purulent conjunctivitis (otitis‑conjunctivitis syndrome). 48, 49
• Severe acute otitis media—characterized by high fever, marked otalgia, and a bulging tympanic membrane—warrants the high‑dose regimen. 48, 49
• In children 6–23 months old with bilateral acute otitis media, high‑dose therapy is recommended (age‑specific criterion). 48, 49

Treatment Duration

• The recommended course length for acute otitis media is 10 days of therapy. 48, 49