What is A-Cof DH?

Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.

Hydrocodone is a narcotic cough suppressant.

Guaifenesin and hydrocodone is used to treat cough and reduce chest congestion caused by the common cold, flu, or allergies.

Source: http://www.drugs.com/