ZzzQuil liquid capsules help you fall asleep in as little as 20 minutes. ZzzQuil LiquiCaps contain a non-habit-forming ingredient, Diphenhydramine HCI, that helps you get the sleep you need. Each dose (two LiquiCaps) contains 50mg.

Our PURE Zzzs line uses the active ingredient melatonin, which is a hormone that occurs naturally in your body. While each have been shown to be safe and effective, you should choose the product that works best for you and your body.

Don't take ZzzQuil every night. Talk with your doctor if you have questions about how long you can take ZzzQuil and at what dosage. In general, taking this medication only from time to time should keep side effects to a minimum. Talk to your doctor if you think this medication isn't helping you sleep.

ZzzQuil is a safe and effective medication for treating short-term sleeping difficulties, or insomnia, in people over 12 years old. However, individuals with certain medical conditions, such asthma and heart disease, should speak to a doctor before taking ZzzQuil.

It is typically safe for adults to take melatonin every night for short periods of time.

To summarize, melatonin is a safer choice to treat insomnia than Zzzquil or Tylenol PM. If your insomnia is more moderate, you may want to try Zzzquil, and if you're also dealing with acute pain or fever, then you may want to try Tylenol PM, but be careful to follow the directions and avoid overusing these drugs.

'P.M.' medicines like Tylenol, Aleve, Excedrin, and even ZzzQuil can cause big problems like liver damage, ulcers, or kidney damage.

Despite the lack of data and variability around dosing regimens, with typical use, melatonin is largely considered safe. View Source and is generally well-tolerated in healthy adults. The risk of side effects. View Source is low, but can include mild headache, dizziness, nausea, and sleepiness.

Generally, a safe starting dose for adults is between 1 and 5 milligrams of melatonin. Older adults may find doses lower than 1 milligram to be effective.

Common side effects

• Feeling sleepy or tired in the daytime. Do not drive, cycle or use tools or machinery if you're feeling this way.
• Headache. Make sure you rest and drink plenty of fluids.
• Stomach ache.
• Feeling sick (nausea)
• Feeling dizzy.
• Feeling irritable or restless.
• Dry mouth.
• Dry or itchy skin.

Melatonin Melatonin: Melatonin is considered one of the safest over-the-counter sleep aids, with few side effects. A prescription drug called ramelteon is designed to mimic the effects of melatonin. Like melatonin, it is not considered habit-forming and it does not affect balance.

Drowsiness, dizziness, constipation, stomach upset, blurred vision, or dry mouth/nose/throat may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. To relieve dry mouth, suck (sugarless) hard candy or ice chips, chew (sugarless) gum, drink water, or use a saliva substitute.