Amoxicillin Child Dose

Pediatric amoxicillin dosing by weight

Amoxicillin is a beta-lactam antibiotic, and for a lot of bacterial infections in children it is the first thing doctors reach for. The usual daily dose runs 30–50 mg/kg/day, split into 2 or 3 doses. When the infection is tougher, such as acute otitis media, community-acquired pneumonia or sinusitis, pediatric guidelines call for the high-dose regimen of 80–90 mg/kg/day. A course typically runs 8–10 days. The classic suspension (Amoxil, for instance) is 250 mg/5 mL, so the volume per dose works out to (mg per dose ÷ 250) × 5 mL.

Safety disclaimer: antibiotics need a medical prescription (ANVISA controls dispensing), and giving them without a paediatrician's evaluation is genuinely risky. The wrong indication breeds bacterial resistance, hides serious illness, and can set off severe allergic reactions to beta-lactams such as urticaria, anaphylaxis or Stevens-Johnson. Never reuse an old prescription. And always mention any history of penicillin allergy.

Applications

You see it across pediatric outpatient care, emergency departments and primary care: otitis media, streptococcal pharyngitis, community-acquired pneumonia, sinusitis, urinary tract infections (decided case by case) and Lyme disease prophylaxis. A dose calculator does the tedious part, turning the prescribed mg/kg into mL of suspension. References: SBP, the AAP/IDSA guidelines and ANVISA RDC 471/2021 (antimicrobial dispensing control).

FAQ

When does the doctor choose the high-dose 80–90 mg/kg/day regimen? Usually for acute otitis media in children under 2, for infections that keep coming back, for kids in daycare, or in regions where S. pneumoniae resistance is high.

Can I stop antibiotics when the fever goes away? No. Quitting early makes a relapse more likely and gives resistant strains room to take hold. Finish the whole prescribed course, usually 8–10 days.

What if my child has a rash after starting amoxicillin? Stop the medication and call the doctor right away. A rash can be anything from a harmless viral exanthema to a genuine allergy, and only a medical evaluation can tell them apart safely.