Broxyl Junior Syrup is a combination of three drugs that relieves cough with mucus: Ambroxol, Guaifenesin, and Terbutaline. Ambroxol is a mucolytic, meaning it thins and loosens mucus (phlegm) to make coughing easier. Guaifenesin is an expectorant that helps to remove mucus (phlegm) from the airways by reducing its stickiness.