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

Will out of date antihistamine tablets still work ?

A doctor has provided 1 answer
Dr. Michael Zacharisen answered

Specializes in Allergy and Immunology

Maybe: Medications that have passed the expiration may still work, but the pharmaceutical manufacturer cannot guarantee their effectiveness. The longer the medication is out of date, the more likely they are less effective.

Dr Pappas and 2 doctors agreed

Answered 10/27/2013

4.8k views

Thank

Related Questions

A member asked:

I know it is not recommended to take more than one antihistamine pill per 24 hours, but some only last ~8 hours. Which ones lasts for 24 hrs?

A doctor has provided 1 answer

A member asked:

I am about to take an antihistamine for the first time but my friends tell me to use it before bedtime. Will I still feel the effects the next day?

A doctor has provided 1 answer

A member asked:

What will happen if you take 80 sleepasil tablets + 5 antihistamines and half a bottle of gin?

A doctor has provided 1 answer

A member asked:

I am anxious, stressed or even excited. I have heard that antihistamines work well to prevent this, is this true?

A doctor has provided 1 answer

A member asked:

I am constantly itchy, tired and feel irritable. What could be the reason for this? I have taken antihistamines which doesnt always work!

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:

What antihistamines work the fastest and are most effective ? With the tablets do you chew them or take with water ?
Is Xolair commonly used for chronic physical urticarias? Most antihistamines don't work for me. Symptoms still strong.
I have persistent cough & runny nose but only happen at night/morning. My doctor prescribed antihistamine but it still won't work. any ideas?
Can i die by taking too many antihistamine tablets?
What is the average time needed for an antihistamine to begin to work?

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.