Valtrex and Menstruation delayed - a phase IV clinical study of FDA data

Summary:

Menstruation delayed is reported as a side effect among people who take Valtrex (valacyclovir hydrochloride), especially for people who are 40-49 old, also take Hydroxyzine Hydrochloride, and have Dermatitis atopic.

The phase IV clinical study analyzes which people have Menstruation delayed when taking Valtrex. It is created by eHealthMe based on reports of 38,014 people who have side effects when taking Valtrex from the FDA, and is updated regularly.

What is Valtrex?

Valtrex has active ingredients of valacyclovir hydrochloride. It is often used in genital herpes. eHealthMe is studying from 39,999 Valtrex users. Check the latest studies of Valtrex.

What is Menstruation delayed?

Menstruation delayed (late menstruation cycle) is found to be associated with 212 drugs and 440 conditions by eHealthMe. Check the latest studies of Menstruation delayed.

On Jul, 15, 2026

38,014 people reported to have side effects when taking Valtrex.
Among them, 14 people (0.04%) have Menstruation delayed.

Could Valtrex cause Menstruation delayed?

Among these 14 people:

What is the age of people who have Menstruation delayed when taking Valtrex? *

What are other drugs people take besides Valtrex? *

Triamcinolone: 3 people, 21.43%
Dupixent: 3 people, 21.43%
Gabapentin: 3 people, 21.43%
Hydroxyzine Hydrochloride: 3 people, 21.43%
Plan B One-Step: 2 people, 14.29%
Zantac: 1 person, 7.14%
Keppra: 1 person, 7.14%
Advair Hfa: 1 person, 7.14%
Claritin: 1 person, 7.14%
Cymbalta: 1 person, 7.14%

What are other side effects people have besides Menstruation delayed? *

Sleep Disorder: 3 people, 21.43%
Abdominal Discomfort: 2 people, 14.29%
Headache (pain in head): 2 people, 14.29%
Fatigue (feeling of tiredness): 2 people, 14.29%
Oropharyngeal Pain: 2 people, 14.29%
Pain: 2 people, 14.29%
Drug Ineffective: 2 people, 14.29%
Vaginal Bleeding: 2 people, 14.29%
Biliary Dyskinesia (motility disorder that affects the gallbladder and sphincter of oddi): 1 person, 7.14%
Abdominal Pain Upper: 1 person, 7.14%

What are the existing conditions these people have? *

Dermatitis Atopic (inflammatory, chronically relapsing, non-contagious and pruritic skin disorder): 3 people, 21.43%
Herpes Virus Infection: 2 people, 14.29%
Stress And Anxiety: 1 person, 7.14%
Psoriatic Arthropathy (inflammation of the skin and joints with kin condition which typically causes patches (plaques) of red, scaly skin to develop): 1 person, 7.14%
Post-Traumatic Stress Disorder: 1 person, 7.14%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 1 person, 7.14%
Indigestion: 1 person, 7.14%
Hypersensitivity: 1 person, 7.14%
Hidradenitis (chronic disease of a type of sweat gland): 1 person, 7.14%
Depression: 1 person, 7.14%

* Approximation only. Some reports may have incomplete information.

Do you take Valtrex and have Menstruation delayed?

- Check whether Menstruation delayed is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously

Related studies:

Effectiveness of, long term effects of, and alternative drugs to Valtrex:

Valtrex (39,999 reports)

Browse all side effects of Valtrex:

a b c d e f g h i j k l m n o p q r s t u v w x y z

Browse all the drugs that are associated with Menstruation delayed:

Menstruation delayed (212 drugs)

Browse all the conditions that are associated with Menstruation delayed:

Menstruation delayed (440 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on valacyclovir hydrochloride (the active ingredients of Valtrex) and Valtrex (the brand name). Other drugs that have the same active ingredients (e.g. generic drugs) are not considered. Dosage of drugs is not considered in the study.

How to use the study?

DO NOT STOP MEDICATIONS without first consulting your doctor. If there are any serious or long term adverse effects discovered in the study, discuss the study with your doctor to ensure that proper medication management will be in place if applicable.

Who is eHealthMe?

With medical big data and proven AI/ML algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 800+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).

WARNING, DISCLAIMER, USE FOR PUBLICATION

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.