Question: what are the best drug for cough?
Answer: Dextromethorphan is used to treat a cough and is available over the counter in syrup, capsule, spray, tablet, and lozenge form. It is also present in many over-the-counter and prescription combination medications. The most common brand names include Robafen Cough (Robitussin) and Vicks Dayquil Cough.