how can you stop a bad cough?

My son can’t stop coughing and he has asthma

Honey is considered highly beneficial in the treatment of asthma. Eat honey or take either in milk or water. It thins accumulated mucous and helps to eliminate from the respiratory passages. It also prevents the production of mucous in future.

Take 1 teaspoon honey mixed with a pinch of clove powder, 2 or 3 times a day.

Take one tsp fresh ginger juice mixed with a cup of fenugreek decoction and honey to taste. This mixture acts as a excellent expectorant.

See below link and act wisely
http://www.homeremediesforyou.com/Asthma