The usual dosing of Augmentin DDS syrup for sinusitis in children around your son's weight often ranges from 25 to 45 mg/kg/day of amoxicillin component, divided into two or three doses. Given your son's weight of 31 kg, 5 ml three times a day (total 15 ml daily) of Augmentin DDS syrup (amoxicillin 400 mg/5 ml) provides about 1200 mg amoxicillin daily, which is within the typical dosing range for moderate infections like sinusitis.

🩺 Dosage Considerations

• Both 5 ml twice daily and 5 ml three times daily can be appropriate depending on infection severity and doctor's judgment.
• Three times daily dosing may be preferred for better infection control in some cases.
• It is important to complete the full prescribed course with food to ensure effectiveness.

🩺 What You Should Do

• Follow the dosing schedule recommended by the doctor who examined your son and understands his condition best.
• If uncertain, consult a pediatrician or an infectious disease specialist to confirm the optimal dose.
• Monitor for any side effects like diarrhea or rash and report them promptly.

If you want, I can explain how dosing is calculated or what signs to watch for during treatment.