Long-Acting Cough Softgels, 20 ct, QC99612 Sale! This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Compare to the Active Ingredient in Robitussin Long-Acting Cough Softgels. Temporarily relieves cough due to minor throat and bronchial irritation due to a cold. Long lasting relief up to 8-hours. For ages 12 and over. Non-drowsy and non-narcotic formula.