ZZZQuil is an over the counter medication which is a nighttime sleep aid to assist with occasional sleeplessness. The active ingredient in ZZZQuil is diphenhydramine, which is the same ingredient in many allergy medications. When used to treat allergies, the most common side effect of diphenhydramine is drowsiness, so it evolved into a medication to help people fall asleep. ZzzQuil is commonly used in people over 12 years of age to treat sleeping difficulties or insomnia and is considered safe and effective over a short period of time. It is not recommended for long term use. If you have certain medical conditions such as heart disease or asthma, consult a medical professional before taking ZZZQuil.Please make sure to read the full instructions, side effects and safety information before you take ZZZQuil. You can use this widget to input text into the page.