HealthTap Online Primary Care Doctors Accepting New Patients
Book a video visit
HealthTap
Telehealth
A member asked:

Sleep medications: how long does it take for "zzzquil" to work?

A doctor has provided 1 answer
Dr. Michael Zacharisen answered

Specializes in Allergy and Immunology

Variable: While the onset of action of Diphenhydramine (active ingredient in zzzquil) is less than 10 minutes, the peak effect is more like 60-90 minutes.

Dr Maes and another doctor agreed

Answered 3/20/2020

4.8k views

Thank

Related Questions

A member asked:

I take 20 mg of celexa (citalopram) every morning is it safe to take zzzquil at night for sleep?

A doctor has provided 1 answer

A member asked:

How long does it take for zzzquil to adjust a sleep cycle? Ive been dealing with insomnia for four weeks. No medical conditions and in good health.

A doctor has provided 1 answer

A member asked:

I just took two aspirins for my headache but i can't sleep so when is it safe to take zzzquil or is it ok now?

A doctor has provided 1 answer

A member asked:

I just started taking Vyvanse (lisdexamfetamine) 30mg and im having trouble sleeping. Would it be ok to take ZzzQuil at night so i can sleep???

6 doctors weighed in across 2 answers

A member asked:

Why do energy drinks make me sleepy instead of energized and sleeping meds \u0026#40;including zzzquil\u0026#41; just don't work or I wake up around 2 every time no matter what time I fall asleep?

A doctor has provided 1 answer

Sponsored Content
HealthTap Medical Group does not endorse products or services. Sponsored content revenues support our mission to make health information free and accessible to all.Learn more

People also searched for:

Can you take both melatonin and zzzquil together to sleep?
How advisable is it to take zzzquil as a sleeping aid?
Can't sleep with Lexapro (escitalopram) is it ok to take ZzzQuil?
Can you tell me is it bad to take the sleep aid "zzzquil" every night?
Can i take zzzquil sleep aid if i took a 150mg Fluconazole?

Telemedicine

Primary Care
Manage Your Conditions
Women's Health
Children's Health
Men's Health
Senior Health
Wellness, Prevention & Lifestyle
Sexual Health
Mental & Behavioral Health
Travel Medicine
Urgent Care
Ask your question
Didn't find what you're looking for?

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.

Ask your question

More of what we treat

Allergies
Antibiotics
Asthma
High Blood Pressure
Prescriptions
Type 2 Diabetes
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.
HealthTap
HIPAA logo
HIPAASecure
Soc 2 Type 2 logo
SOC 2 Type 2Certified
JCAHO Accredited
JCAHOAccredited
Member App

Download HealthTap

Video visit and message your doctor

Member App QR Code
Play Store Member LinkApp Store Member Link

Questions?

+1 (888) 828-0841support@healthtap.com
LinkedInTwitter
HomeTermsPrivacyCookiesDMCAHealth TopicsDoctors DirectoryDoctor Q&A by Specialty
Copyright 2026 HealthTap, Inc.