This Robitussin Lingering Cold Long-Acting Cough Suppressants for Adults relieves coughs for up to eight hours with each dose for day or night relief. Because this is a non-narcotic medication, it is safe to use during daytime activities. The non-drowsy cough suppressant comes in a bottle of 20-ct liquid-filled capsules, so they’re easy to carry with you on the go. Each capsule of Robitussin Cough Suppressant dissolves quickly to ease symptoms quickly. Robitussin Cough Suppressant is a medication that is safe to use for ages 12 years and over.