Pediatrics dose of 4month baby paracetamol metro
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paracetamol metronidazole dose 4 month old infant pediatric mg/kg
Here is the pediatric dosing for a 4-month-old infant for both drugs:
Paracetamol (Acetaminophen) - 4-Month-Old Infant
A 4-month-old typically weighs around 6-7 kg (varies by growth chart).
| Parameter | Dose |
|---|---|
| Oral dose | 10-15 mg/kg/dose every 4-6 hours |
| Rectal (PR) dose | 10-20 mg/kg/dose every 4-6 hours |
| Max daily dose | 60 mg/kg/day (for children under 2 years) |
| Max doses per day | 5 doses in 24 hours |
| Formulation | Suspension 160 mg/5 mL (paediatric syrup) |
Practical example for a 6.5 kg baby:
- Dose = 10-15 mg/kg x 6.5 kg = 65-97.5 mg per dose
- Using 160 mg/5 mL syrup = approximately 2-3 mL per dose every 4-6 hours
Source: ROSEN's Emergency Medicine (Table 157.5); UNC Pediatric Dosing Guidelines
Metronidazole - 4-Month-Old Infant
Metronidazole is used from 2 months of age onwards. At 4 months, the dosing is weight-based:
| Indication | Oral Dose | Frequency |
|---|---|---|
| Anaerobic/bacterial infections | 7.5-10 mg/kg/dose | Every 6-8 hours |
| Amebiasis | 35-50 mg/kg/day divided in 3 doses | For 10 days |
| Giardiasis / GI infection | 15 mg/kg/day divided TDS (max 250 mg/dose) | 5-7 days |
| IV (serious anaerobic infections) | 7.5 mg/kg IV | Every 6-8 hours |
| Max single dose | 500 mg | - |
Practical example for a 6.5 kg baby:
- Dose = 7.5 mg/kg x 6.5 kg = ~49 mg per dose every 8 hours
- Oral metronidazole suspension 200 mg/5 mL = approximately 1.2 mL per dose
Source: Drugs.com (IDSA/AAP guidelines); UNC Pediatric Dosing Guidelines; Yamada's Textbook of Gastroenterology
Important Safety Notes
- Paracetamol under 2 months: Use only under medical supervision; dosing is different for neonates.
- Metronidazole under 2 months: Generally avoided unless strictly necessary; pharmacokinetics are unpredictable in very young infants.
- Always calculate based on actual body weight - obtain an accurate weight before dosing.
- Do not exceed maximum daily doses - paracetamol overdose causes serious liver toxicity.
- Metronidazole may cause GI upset; give with or after feeds to minimise this.
- Consult a paediatrician or pharmacist before administering to confirm indication and exact dose for the individual baby.
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