What are reliable, doctor-recommended herbal remedies to get rid of a cough?

it works: 4 drops of galick juice at bed time works for dry cough only for one day. Hot soup , ginger juice 1/4 cup add 1 teaspoon of turmeric and jiggery ( pure sugar cane solid called gurh in indian store ) to make it sweet take sip and sip 3 days in row cough gone lick on mulhati powder it works.