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

Summary:

Fever is reported as a side effect among people who take Subsys (fentanyl), especially for people who are male, 50-59 old, have been taking the drug for 5 - 10 years also take Oxycodone, and have Breakthrough pain.

The phase IV clinical study analyzes which people have Fever when taking Subsys. It is created by eHealthMe based on reports of 9,232 people who have side effects when taking Subsys 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 Fever?

Fever is found to be associated with 3,509 drugs and 6,133 conditions by eHealthMe. Check the latest studies of Fever.

On Sep, 20, 2025

9,232 people reported to have side effects when taking Subsys.
Among them, 8 people (0.09%) have Fever.

Among these 8 people:

How long have people been on Subsys when they have Fever? *

What is the gender of people who have Fever when taking Subsys? *

female: 50 %
male: 50 %

What is the age of people who have Fever when taking Subsys? *

What are other drugs people take besides Subsys? *

What are other side effects people have besides Fever? *

Initial Insomnia (feeling of inadequate or poor-quality sleep): 2 people, 25.00%
Pain: 2 people, 25.00%
Neoplasm Progression (growth of tumour): 2 people, 25.00%
Nausea (feeling of having an urge to vomit): 2 people, 25.00%
Malaise (a feeling of general discomfort or uneasiness): 2 people, 25.00%
Hyperhidrosis (abnormally increased sweating): 2 people, 25.00%
Feeling Abnormal: 2 people, 25.00%
Dyspnea (difficult or laboured breathing): 1 person, 12.50%
Bronchitis (inflammation of the mucous membrane in the bronchial tubes): 1 person, 12.50%
Chills (felling of cold): 1 person, 12.50%

What are the existing conditions these people have? *

Breakthrough Pain: 4 people, 50.00%
Pain: 3 people, 37.50%
Cancer Pain: 1 person, 12.50%
Cancer - Throat Or Larynx: 1 person, 12.50%

* Approximation only. Some reports may have incomplete information.

Do you take Subsys and have Fever?

- Check whether Fever 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)

Fever treatments and more:

Fever (498,662 reports)

How severe was Fever and when was it recovered:

Fever in Subsys

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 Fever:

Fever (3,509 drugs)

Browse all the conditions that are associated with Fever:

Fever (6,133 conditions)

Related publications that referenced our studies

Schiller D, Maieron A, Sch?fl R, Donnerer J, "Drug fever due to a single dose of pantoprazole", Pharmacology, 2015 Jan .

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.