Robitussin CF Nighttime is part of the Acetaminophen Combinations class and treats Flu, Cold Symptoms and Fever. Acetaminophen is combined with other active ingredients like diphenhydramine and dextromethorphan to relieve cough, cold, allergy, and insomnia symptoms along with treating pain, menstrual pain, and fever. Robitussin CF Nighttime is only available as a brand name drug.