Subsys and Varicosity - a phase IV clinical study of FDA data

Summary:

We study 9,354 people who take Subsys (fentanyl) or have Varicosity. No report of Varicosity is found in people who take Subsys.

The phase IV clinical study is created by eHealthMe based on reports from the FDA, and is updated regularly.

What is Subsys?

Subsys has active ingredients of fentanyl. eHealthMe is studying from 9,239 Subsys users. Check the latest studies of Subsys.

What is Varicosity?

Varicosity (varix or varicose condition in which a vein is swollen and tortuous) is found to be associated with 49 drugs and 8 conditions by eHealthMe. Check the latest studies of Varicosity.

On Jun, 23, 2026

No report is found.

Do you take Subsys and have Varicosity?

- Check whether Varicosity 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 Subsys:

Subsys (9,239 reports)

Varicosity treatments and more:

Varicosity (115 reports)

How severe was Varicosity and when was it recovered:

Varicosity in Subsys

Expand to all the drugs that have ingredients of fentanyl:

Varicosity and drugs with ingredients of fentanyl (2 reports)

Browse all side effects of Subsys:

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 Varicosity:

Varicosity

Browse all the conditions that are associated with Varicosity:

Varicosity

How the study uses the data?

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