I get cough ,what medicines i can use?

I suggest: dark brown/black honey or Generic Robitussin DM in conjuction with forcing fluids and hot steam showers 3-4 times a day.

Cough: Hydrate well. Consider using a warm air vaporizer. Mix several teaspoons of honey into herbal tea w a squeeze of lemon juice. Or make tea w 2 tsp of Marshmallow root bark per 1 cup of hot water (steep in a covered pot for at least 5 mins). Drink several times a day or as needed to relieve coughing. See a physician if cough is not resolving, difficulty breathing or temp greater than 104.