I had dry cough at 19 october but there is no any relief from that?

Inhaler: Sounds like you could have post bronchitis syndrome. With bronchitis the large tubes in the lungs get burned by the infection. Ever time cool air rushed over them when we breath, it s irritating be we cough. This can last foe months. Ask your doctor about an inhaled steroid. This will decrease the healing time.

Upper air cough: It is likely that you are having upper airway cough syndrome, formerly named postnasal drip. Some mucus being produced in back of nose tickling the throat which triggers your cough. If this is a recurrent problem, a reactive-airway disease (asthma-like) is possible. Try some otc antihistamine and delsym (dextromethorphan) for few days. If no improvement, consult doc for eval. Good luck.