Robitussin for chesty coughs with congestion is a full strength medicine with two important ingredients for when congestion can be as problematic as the cough itselfa decongestant combined with a proven expectorant formulation is our tried and tested formula for reliefthe expectorant helps loosen the mucus that builds up in the lungs and makes this phlegm easier to cough upthe decongestant helps reduce the swelling of the nasal cavity making breathing easier robitussin chesty cough with cong