Vioxx and Encephalopathy - a phase IV clinical study of FDA data

Summary:

Encephalopathy is reported as a side effect among people who take Vioxx (rofecoxib), especially for people who are female, 60+ old, have been taking the drug for 2 - 5 years also take Ultram, and have High blood pressure.

The phase IV clinical study analyzes which people have Encephalopathy when taking Vioxx. It is created by eHealthMe based on reports of 110,097 people who have side effects when taking Vioxx from the FDA, and is updated regularly.

What is Vioxx?

Vioxx has active ingredients of rofecoxib. It is often used in arthritis. eHealthMe is studying from 110,130 Vioxx users. Check the latest studies of Vioxx.

What is Encephalopathy?

Encephalopathy (functioning of the brain is affected by some agent or condition) is found to be associated with 1,459 drugs and 1,606 conditions by eHealthMe. Check the latest studies of Encephalopathy.

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, 30, 2026

110,097 people reported to have side effects when taking Vioxx.
Among them, 246 people (0.22%) have Encephalopathy.

Among these 246 people:

* Approximation only. Some reports may have incomplete information.

Do you take Vioxx and have Encephalopathy?

- Check whether Encephalopathy 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 Vioxx:

Vioxx (110,130 reports)

Encephalopathy treatments and more:

Encephalopathy (27,832 reports)

How severe was Encephalopathy and when was it recovered:

Encephalopathy in Vioxx

Expand to all the drugs that have ingredients of rofecoxib:

Encephalopathy and drugs with ingredients of rofecoxib (263 reports)

Sub-studies by gender and age:

Female: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Male: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Browse all side effects of Vioxx:

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 Encephalopathy:

Encephalopathy (1,459 drugs)

Browse all the conditions that are associated with Encephalopathy:

Encephalopathy (1,606 conditions)

Related publications that referenced our studies

Kapoor A, Kumar V, Beniwal S, Dutta S, Goyal S, Kumar HS, "Posterior reversible encephalopathy syndrome in non-Hodgkin's lymphoma: Not necessarily reversible!", Clinical Cancer Investigation Journal, 2015 Mar .
Kapoor A, Kumar V, Beniwal S, Dutta S, Goyal S, Kumar HS, "Posterior reversible encephalopathy syndrome in non-Hodgkin's lymphoma: Not necessarily reversible!", Clinical Cancer Investigation Journal, 2015 Mar .

How the study uses the data?

The study uses data from the FDA. It is based on rofecoxib (the active ingredients of Vioxx) and Vioxx (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.