Codeine and Underactive thyroid - a phase IV clinical study of FDA data

Summary:

Underactive thyroid is reported as a side effect among people who take Codeine (codeine sulfate), especially for people who are female, 60+ old, have been taking the drug for < 1 month also take Morphine, and have Rheumatoid arthritis.

The phase IV clinical study analyzes which people have Underactive thyroid 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 Underactive thyroid?

Underactive thyroid is found to be associated with 2,732 drugs and 2,636 conditions by eHealthMe. Check the latest studies of Underactive thyroid.

On Feb, 09, 2026

41,713 people reported to have side effects when taking Codeine.
Among them, 189 people (0.45%) have Underactive thyroid.

Could Codeine cause Underactive thyroid?

Among these 189 people:

How long have people been on Codeine when they have Underactive thyroid? *

Click here to view more results

What is the gender of people who have Underactive thyroid when taking Codeine? *

Click here to view

* Approximation only. Some reports may have incomplete information.

Do you take Codeine and have Underactive thyroid?

- Check whether Underactive thyroid 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)

Underactive thyroid treatments and more:

Underactive thyroid (168,056 reports)

How severe was Underactive thyroid and when was it recovered:

Underactive thyroid in Codeine

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

Underactive thyroid and drugs with ingredients of codeine sulfate (189 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 Underactive thyroid:

Underactive thyroid (2,732 drugs)

Browse all the conditions that are associated with Underactive thyroid:

Underactive thyroid (2,636 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.