Codeine and Multiple sclerosis relapse - a phase IV clinical study of FDA data

Summary:

Multiple sclerosis relapse is reported as a side effect among people who take Codeine (codeine sulfate), especially for people who are male, 50-59 old, also take Rebif, and have Secondary progressive multiple sclerosis.

The phase IV clinical study analyzes which people have Multiple sclerosis relapse when taking Codeine. It is created by eHealthMe based on reports of 41,713 people who have side effects when taking Codeine from the FDA, and is updated regularly.

What is Codeine?

Codeine has active ingredients of codeine sulfate. It is often used in pain. eHealthMe is studying from 42,342 Codeine users. Check the latest studies of Codeine.

What is Multiple sclerosis relapse?

Multiple sclerosis relapse (reoccurrence of a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath) is found to be associated with 1,043 drugs and 942 conditions by eHealthMe. Check the latest studies of Multiple sclerosis relapse.

On May, 14, 2026

41,713 people reported to have side effects when taking Codeine.
Among them, 139 people (0.33%) have Multiple sclerosis relapse.

Could Codeine cause Multiple sclerosis relapse?

Among these 139 people:

What is the gender of people who have Multiple sclerosis relapse when taking Codeine? *

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What is the age of people who have Multiple sclerosis relapse when taking Codeine? *

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* Approximation only. Some reports may have incomplete information.

Do you take Codeine and have Multiple sclerosis relapse?

- Check whether Multiple sclerosis relapse 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 Codeine:

Codeine (42,342 reports)

Multiple sclerosis relapse treatments and more:

Multiple sclerosis relapse (89,124 reports)

How severe was Multiple sclerosis relapse and when was it recovered:

Multiple sclerosis relapse in Codeine

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

Multiple sclerosis relapse and drugs with ingredients of codeine sulfate (139 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 Codeine:

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 Multiple sclerosis relapse:

Multiple sclerosis relapse (1,043 drugs)

Browse all the conditions that are associated with Multiple sclerosis relapse:

Multiple sclerosis relapse (942 conditions)

How the study uses the data?

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