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Paracetamol (Pacimol) Dosing for a 5-Month-Old, 7 kg Infant
Step 1 — Calculate the Dose
The standard paracetamol dose for fever in infants is 10–15 mg/kg/dose, given every 4–6 hours. Do not exceed 5 doses in 24 hours.
| Calculation |
|---|
| Low end (10 mg/kg) | 10 × 7 = 70 mg/dose |
| High end (15 mg/kg) | 15 × 7 = 105 mg/dose |
The Harriet Lane Handbook dosing table for an infant weighing 5.1–7.7 kg (4–11 months) gives a recommended dose of 80 mg per dose — this falls within the 10–15 mg/kg range and is the standard reference dose for this weight band.
Step 2 — Calculate the Volume from Pacimol 15 mg/5 mL Syrup
Pacimol pediatric syrup is available as 15 mg / 5 mL (3 mg/mL).
| Dose | Volume needed |
|---|
| 70 mg | 70 ÷ 3 = ~23.3 mL |
| 80 mg (standard ref dose) | 80 ÷ 3 = ~26.7 mL |
| 105 mg | 105 ÷ 3 = 35 mL |
⚠️ Important note: Pacimol 15 mg/5 mL is a very low-concentration formulation. For a 7 kg infant, even the minimum dose (~70 mg) requires over 23 mL in one sitting, which is a large volume for a 5-month-old. This formulation is more commonly intended for neonates/small infants in specific clinical settings.
Recommended Action
The more practical formulation for home/outpatient use is:
- Pacimol syrup 125 mg/5 mL (25 mg/mL) → dose would be 2.8–4.2 mL (much more practical)
Please verify which Pacimol formulation you actually have:
- Pacimol 15 mg/5 mL → need ~23–27 mL per dose (unusually large volume — double-check the label)
- Pacimol 125 mg/5 mL → need ~2.8–4.2 mL per dose (standard)
If the bottle truly reads 15 mg/5 mL, give approximately 26–27 mL per dose, but this is an atypical formulation and you should confirm with a pharmacist or prescribing physician.
Summary (if bottle is confirmed 15 mg/5 mL):
- Dose: 80 mg (standard for 7 kg infant, 4–11 months)
- Volume: ~26–27 mL per dose
- Frequency: Every 4–6 hours, max 5 doses in 24 hours
- Max daily dose: 75 mg/kg/day = 525 mg/day
— The Harriet Lane Handbook, 23rd Ed., p. 1093 (Acetaminophen section)
Disclaimer: This is for educational reference only. Always confirm dosing with a licensed healthcare provider or pharmacist before administering medication to an infant.