Hello.
You don’t need to give Syp Maxtra(Chlorpheniramine) to your child. Please refrain from cough medications for your child.
Instead use saline nasal drops 2 drops b/l nostril 6 hourly for the nasal blockage and provide steam inhalation thrice daily.
Next Steps
Keep the surroundings clean and humidified.
Health Tips
Cough is a general response, you dont need to suppress it. Humidifying the lining is much important. Hope this helps. Wish your child a speedy recovery.