Asked for male, 31 years old from Visakhapatnam
Syp. Kuflril LS is not used for simple cold and cough. It is used for cough along with chest congestion. The ingredients in that syrup have other effects as well which will trouble more than helping him.
You can try over the counter syrups like Sinarest AF or Tixylix. There are various reasons behind child having cough. If those medicines do not help or child starts getting fever then meet your paediatrician.