How Can Cough Along With Fever In A Child Be Treated?

My son is of 8 yrs 11 months and his weight is 32 kg. He s suffering from cough for more than 1 week with no or very mild fever. Doctor prescribed him Sulbutamol 2mg (1+0+1) and Ketotifen 1mg (0+0+1). After giving 2 doges of Sulbutamol (Brodil) he started experiencing Astma with sound of air flow which we d never seem in him before. We stopped the drags and took him to another doctor who says it is bronchial astma and prescrived Fimoxyclav (Amoxyciline BP 250 mg (1+1+1)), Montilucast 5mg (0+0+1). We are following the 2nd prescription only but now 3 days gone without significant improvement of Astma symptom. Could you please suggest us what else we could do to get him healed? Regrards, Shahjahan