Mucolytic & fluidifying effect in conditions w/ hyper- or hypoviscous mucus. Acute & chronic disorders of the upper & lower resp tract eg, COPD & prevention of acute exacerbations associated w/ chronic obstructive bronchitis. Ear, nose & throat disorders eg, pharyngitis, tonsillitis, laryngitis, rhinitis, rhinopharyngitis, sinusitis; otitis (syr).