Valtrex and Gallbladder enlargement - a phase IV clinical study of FDA data

Summary:

Gallbladder enlargement is reported as a side effect among people who take Valtrex (valacyclovir hydrochloride), especially for people who are female, 60+ old, also take Coenzyme Q10, and have Hyperlipidaemia.

The phase IV clinical study analyzes which people have Gallbladder enlargement 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 Gallbladder enlargement?

Gallbladder enlargement is found to be associated with 274 drugs and 644 conditions by eHealthMe. Check the latest studies of Gallbladder enlargement.

eHealthMe: drug outcomes in the real world

eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.

On Aug, 21, 2026

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

Could Valtrex cause Gallbladder enlargement?

Among these 14 people:

What is the gender of people who have Gallbladder enlargement when taking Valtrex? *

female: 92.86 %
male: 7.14 %

What is the age of people who have Gallbladder enlargement when taking Valtrex? *

What are other drugs people take besides Valtrex? *

What are other side effects people have besides Gallbladder enlargement? *

Gastroenteritis (inflammation of stomach and intestine): 11 people, 78.57%
Injection Site Pain: 11 people, 78.57%
Flank Pain (a distressing sensation experienced around the lower back and the upper abdomen): 10 people, 71.43%
Pain In Extremity: 9 people, 64.29%
Gastritis - Chronic (long lasting inflammation of stomach): 9 people, 64.29%
Intra-Abdominal Haemorrhage (intra-abdominal bleeding): 8 people, 57.14%
Iron Deficiency Anaemia: 8 people, 57.14%
Joint Pain: 8 people, 57.14%
Diverticulitis (digestive disease which involves the formation of pouches (diverticula) within the bowel wall): 8 people, 57.14%
Torticollis (a twisted neck in which the head is tipped to one side, while the chin is turned to the other): 8 people, 57.14%

What are the existing conditions these people have? *

Type 2 Diabetes: 10 people, 71.43%
Hypothyroidism (abnormally low activity of the thyroid gland, resulting in retardation of growth and mental development): 10 people, 71.43%
Asthma: 10 people, 71.43%
Constipation: 10 people, 71.43%
Dizziness: 10 people, 71.43%
Essential Tremor: 10 people, 71.43%
Fibromyalgia (a long-term condition which causes pain all over the body): 10 people, 71.43%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 10 people, 71.43%
Stress And Anxiety: 10 people, 71.43%
Hyperlipidaemia (presence of excess lipids in the blood): 10 people, 71.43%

* Approximation only. Some reports may have incomplete information.

Do you take Valtrex and have Gallbladder enlargement?

- Check whether Gallbladder enlargement 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 Gallbladder enlargement:

Gallbladder enlargement (274 drugs)

Browse all the conditions that are associated with Gallbladder enlargement:

Gallbladder enlargement (644 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.