Synthroid and Bradykinesia - a phase IV clinical study of FDA data

Summary:

Bradykinesia is reported as a side effect among people who take Synthroid (levothyroxine sodium), especially for people who are female, 60+ old, also take Nuplazid, and have Gastroesophageal reflux disease.

The phase IV clinical study analyzes which people have Bradykinesia when taking Synthroid. It is created by eHealthMe based on reports of 237,758 people who have side effects when taking Synthroid from the FDA, and is updated regularly.

What is Synthroid?

Synthroid has active ingredients of levothyroxine sodium. It is often used in hypothyroidism. eHealthMe is studying from 249,198 Synthroid users. Check the latest studies of Synthroid.

What is Bradykinesia?

Bradykinesia (decreased bodily movement. it is associated with basal ganglia diseases) is found to be associated with 429 drugs and 469 conditions by eHealthMe. Check the latest studies of Bradykinesia.

On Jul, 19, 2026

237,758 people reported to have side effects when taking Synthroid.
Among them, 34 people (0.01%) have Bradykinesia.

Among these 34 people:

What is the gender of people who have Bradykinesia when taking Synthroid? *

female: 72.73 %
male: 27.27 %

What is the age of people who have Bradykinesia when taking Synthroid? *

What are other drugs people take besides Synthroid? *

What are other side effects people have besides Bradykinesia? *

Weakness: 13 people, 38.24%
Drowsiness: 11 people, 32.35%
Fatigue (feeling of tiredness): 9 people, 26.47%
Tremor (trembling or shaking movements in one or more parts of your body): 9 people, 26.47%
Gait Disturbance: 9 people, 26.47%
Nausea (feeling of having an urge to vomit): 8 people, 23.53%
Confusional State: 8 people, 23.53%
Malaise (a feeling of general discomfort or uneasiness): 7 people, 20.59%
Diarrhea: 7 people, 20.59%
Dizziness: 7 people, 20.59%

What are the existing conditions these people have? *

Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 7 people, 20.59%
Hallucinations (sensations that appear real but are created by your mind): 6 people, 17.65%
Delusion (a false belief or opinion): 5 people, 14.71%
Parkinson's Disease: 5 people, 14.71%
Crohn's Disease (a condition that causes inflammation of the gastrointestinal tract): 4 people, 11.76%
Depression: 3 people, 8.82%
Irritable Bowel Syndrome: 2 people, 5.88%
Gastric Disorder (disease of stomach): 2 people, 5.88%
Constipation: 2 people, 5.88%
High Blood Cholesterol: 2 people, 5.88%

* Approximation only. Some reports may have incomplete information.

Do you take Synthroid and have Bradykinesia?

- Check whether Bradykinesia 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 Synthroid:

Synthroid (249,198 reports)

Bradykinesia treatments and more:

Bradykinesia (6,795 reports)

Browse all side effects of Synthroid:

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 Bradykinesia:

Bradykinesia (429 drugs)

Browse all the conditions that are associated with Bradykinesia:

Bradykinesia (469 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on levothyroxine sodium (the active ingredients of Synthroid) and Synthroid (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.