Combantrin Dosage for 20.4 kg Child
For a child weighing 20.4 kg, administer pyrantel pamoate (Combantrin) at 10 mg/kg body weight as a single dose for roundworm (Ascaris) infection, which equals 204 mg total, or 20 mg/kg daily for 3 consecutive days (408 mg daily) if treating hookworm infection.
Dosing Based on Parasite Type
The appropriate dose depends on which intestinal worm you are treating:
For Ascaris (Roundworm) Infection
- Single dose: 10 mg/kg = 204 mg for this 20.4 kg child 1
- This achieves cure rates of 93-97% 1, 2
- Well-tolerated with minimal side effects 1
For Hookworm Infection
- 20 mg/kg daily for 3 days = 408 mg daily for this child 1
- Single doses are inadequate for hookworm (only 29-53% cure rate) 1, 2
- The 3-day regimen achieves 73% cure rates and significantly better egg reduction 1
For Mixed Infections (Ascaris + Hookworm)
- Use the hookworm regimen: 20 mg/kg daily for 3 days 1
- This covers both parasites effectively
Important Clinical Considerations
Pyrantel pamoate has NO efficacy against Trichuris (whipworm). Multiple studies consistently show cure rates of only 27-46%, which is no better than placebo 1, 2, 3. If Trichuris is present, consider alternative agents like oxantel pamoate or albendazole/mebendazole combinations.
Practical Administration
- Shake suspension well before use
- Can be given as single morning dose
- No fasting required
- Well-tolerated across all age groups 1
Safety Profile
The drug demonstrates excellent tolerability in pediatric populations with only mild, transient side effects reported 1, 2, 3. The evidence shows pyrantel pamoate has very limited systemic absorption as the pamoate salt, remaining primarily in the gastrointestinal tract where it exerts its anthelminthic effect 4.
Common Pitfall to Avoid
Do not use single-dose regimens for hookworm infections. The evidence clearly demonstrates that while 10 mg/kg works excellently for Ascaris, hookworm requires either higher doses (20 mg/kg) or multiple days of treatment 1, 3. Using inadequate dosing leads to treatment failure and continued morbidity from hookworm-related anemia.