Plaquenil and Flank pain - a phase IV clinical study of FDA data

Summary:

Flank pain is reported as a side effect among people who take Plaquenil (hydroxychloroquine sulfate), especially for people who are female, 40-49 old, have been taking the drug for < 1 month also take Enbrel, and have Fibromyalgia.

The phase IV clinical study analyzes which people have Flank pain when taking Plaquenil. It is created by eHealthMe based on reports of 88,348 people who have side effects when taking Plaquenil from the FDA, and is updated regularly.

What is Plaquenil?

Plaquenil has active ingredients of hydroxychloroquine sulfate. It is often used in systemic lupus erythematosus. eHealthMe is studying from 91,018 Plaquenil users. Check the latest studies of Plaquenil.

What is Flank pain?

Flank pain (a distressing sensation experienced around the lower back and the upper abdomen) is found to be associated with 1,133 drugs and 1,476 conditions by eHealthMe. Check the latest studies of Flank pain.

On Jul, 08, 2026

88,348 people reported to have side effects when taking Plaquenil.
Among them, 209 people (0.24%) have Flank pain.

Among these 209 people:

* Approximation only. Some reports may have incomplete information.

Do you take Plaquenil and have Flank pain?

- Check whether Flank pain 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 Plaquenil:

Plaquenil (91,018 reports)

Flank pain treatments and more:

Flank pain (12,893 reports)

How severe was Flank pain and when was it recovered:

Flank pain in Plaquenil

Expand to all the drugs that have ingredients of hydroxychloroquine sulfate:

Flank pain and drugs with ingredients of hydroxychloroquine sulfate (259 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 Plaquenil:

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 Flank pain:

Flank pain (1,133 drugs)

Browse all the conditions that are associated with Flank pain:

Flank pain (1,476 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on hydroxychloroquine sulfate (the active ingredients of Plaquenil) and Plaquenil (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.