How Does ZzzQuil Work for Insomnia?
ZzzQuil, an over-the-counter sleep aid that contains the generic antihistamine diphenhydramine, is sometimes used to help people with difficulty falling or staying asleep. ZzzQuil may work because its ingredients lead to drowsiness, but it may not be effective, and it can present risks that you should discuss with your healthcare provider.
Source: Verywell health
