Synthroid and Injection site cyst - a phase IV clinical study of FDA data

Summary:

Injection site cyst is reported as a side effect among people who take Synthroid (levothyroxine sodium), especially for people who are male, 60+ old, have been taking the drug for 1 - 6 months also take Lipitor, and have Zollinger-ellison syndrome.

The phase IV clinical study analyzes which people have Injection site cyst 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 Injection site cyst?

Injection site cyst is found to be associated with 32 drugs and 97 conditions by eHealthMe. Check the latest studies of Injection site cyst.

On Jul, 06, 2026

237,758 people reported to have side effects when taking Synthroid.
Among them, 16 people (0.01%) have Injection site cyst.

Could Synthroid cause Injection site cyst?

Among these 16 people:

How long have people been on Synthroid when they have Injection site cyst? *

What is the gender of people who have Injection site cyst when taking Synthroid? *

female: 25 %
male: 75 %

What is the age of people who have Injection site cyst when taking Synthroid? *

What are other drugs people take besides Synthroid? *

What are other side effects people have besides Injection site cyst? *

Muscle Spasms (muscle contraction): 14 people, 87.50%
Gait Disturbance: 14 people, 87.50%
Weakness: 14 people, 87.50%
Injection Site Swelling: 12 people, 75.00%
Injection Site Pain: 12 people, 75.00%
Fainting (loss of consciousness and postural tone): 11 people, 68.75%
Body Temperature Decreased: 11 people, 68.75%
Back Pain: 11 people, 68.75%
Hypokinesia (decreased bodily movement): 11 people, 68.75%
Hypotension (abnormally low blood pressure): 11 people, 68.75%

What are the existing conditions these people have? *

Zollinger-Ellison Syndrome (increased production of the hormone gastrin from a small tumour of pancreas): 11 people, 68.75%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 3 people, 18.75%
Alcoholism (problems with alcohol): 2 people, 12.50%
Neuropathy Peripheral (surface nerve damage): 1 person, 6.25%
High Blood Pressure: 1 person, 6.25%
Glucose Tolerance Impaired (blood glucose is raised beyond normal levels, but not high enough to warrant a diabetes diagnosis): 1 person, 6.25%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 1 person, 6.25%
Depression: 1 person, 6.25%

* Approximation only. Some reports may have incomplete information.

Do you take Synthroid and have Injection site cyst?

- Check whether Injection site cyst 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)

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 Injection site cyst:

Injection site cyst (32 drugs)

Browse all the conditions that are associated with Injection site cyst:

Injection site cyst (97 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.