How Much Sleep Aid Is In Nyquil?

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Many over-the-counter medications, including Nyquil, contain sleep aids. However, the amount of sleep aid in Nyquil is comparatively low. According to the Nyquil website, each 30ml dose of Nyquil Cold & Flu (Nighttime) contains only 3.7mg of diphenhydramine HCl, an antihistamine that has sedative effects. In comparison, other popular cold and flu medications like Mucinex D contain 30mg of diphenhydramine HCl per dose. That's nearly eight times the amount of diphenhydramine in Nyquil.

Nyquil is a popular over-the-counter medication that people use to relieve symptoms of the common cold and flu. It can also be used as a sleep aid. Nyquil contains the active ingredient diphenhydramine, which is an antihistamine that can help to induce sleep. The exact amount of diphenhydramine in Nyquil is not known, but it is generally safe for most people to take. The recommended dose for adults is two tablespoons before bedtime.


Diphenhydramine can cause some side effects, such as dry mouth, drowsiness, and dizziness. It is important to read the label carefully and follow the instructions when taking Nyquil. If you have any questions, talk to your doctor or pharmacist. Nyquil is a over the counter medication that is available for purchase without a prescription. It is used to relieve symptoms of the common cold and flu. Nyquil can also be used as a sleep aid. The active ingredient in Nyquil that helps you sleep is diphenhydramine hydrochloride.


Diphenhydramine hydrochloride is an antihistamine that is sometimes used as a sleep aid because it can cause drowsiness. The recommended dose of diphenhydramine for adults is 50 mg to 150 mg per day. The recommended dose of Nyquil for adults is 2 caplets or 2 tablespoons (30 mL) every 6 hours, not to exceed 8 caplets or 8 tablespoons (120 mL) in 24 hours.


Nyquil contains 10 mg of diphenhydramine hydrochloride per caplet. This means that if you takes the recommended dose of Nyquil, you would be getting 50 mg to 150 mg of diphenhydramine hydrochloride. The maximum recommended dose of diphenhydramine hydrochloride is 300 mg per day.

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