Mar 10, 2016 Choosing a cold medicine can be very confusing. You should only take one ingredient from each group at a time. Antihistamines, Runny nose, sneezing, watery eyes, Loratadine (Claritin), Cetirizine (Zyrtec), Fexofenadine (Allegra), Tylenol Cold/Flu, DayQuil, Robitussin DM, Coricidin...