No, you can't. Dayquil contains acetaminophen, which is the active ingredient in Tylenol. Taking both at once can very easily cause liver failure, which can result in a coma or death. You also can't mix either of them with alcohol or other medicines containing acetaminophen, such as Vicodin.
yes
It is generally safe to mix DayQuil with coffee, as there is no known interaction between the two. However, the caffeine from the coffee may enhance the stimulant effects of DayQuil, potentially causing jitters or insomnia. It is best to moderate your consumption of coffee while taking DayQuil.
yes
You should not mix medications without your doctor's permsiion
yes
Yes, i just did when i ran out of Advil. It works the Same as Tylenol with acetaminophen.
yes
Yes
Yes
no
yes
yes