For fever, you should use any paracetamol containing syrup. Mefanemic acid containing syrup should be used only when fever is not subsiding with paracetamol. Keep giving antipyretics whenever t>100 max 6th hrly for today as well.if any other or new symptoms come or child.is not playing well or lethargic or fever persisting more than 2 days, you should consult.
Next Steps
drink plenty of water and watch for symptoms.
Health Tips
4 years child with weight 22 kg is too much. you should seek medical advice for this aspect as well once this fever subsides.