It only take a short amount of time for this medication to work. It costs less and it works just as well as the brand name allergy medications. It helps with drying up a runny nose, takes away the itch from your eyes, helps with a try or mucus cough and lets you get back to what you need to do. Most important it takes away that I want to chop off my nose because I can't take it anymore feeling! You no longer have to deal with the crumpled up tissues, a red, dry and irritated nose and a awful scratchy throat. You may feel a bit drowsy due to the decongestant. If you are sensitive to medication I would take this before going to bed. Your chances of falling asleep at work or at school would be taken away. If you aren't sensitive to medication it might be okay to take it before you go out for the day. You should also check it see whether or not it is the day time or night time version of the medication.