I've been dealing with a cough since November and NOTHING WORKS. Doctor recommended Robitussin in the beginning, didn't work. Then they suggested Mucinex DM. No luck. Now I'm almost done with a prescription (which, imo, they should have given me in the first place) and I'm STILL coughing up a storm. The only thing that seems to calm my cough is essential oils, but they can't fully get rid of it either.