Can i make robitussin-dm taste better?

Not that I know of: There is a reason people say something tastes like cough medicine.....The ingredients and many have an alcohol base that just makes them taste yucky. I would look for it as a pill or look to other possibilities. Honey and lemon are known to be excellent for coughs. Warm drinks help him phlegm. Elderberry is excellent for coughs. It contains sambucous and sambucous is good for mucous.