Phentermine and Thyroid function test abnormal - a phase IV clinical study of FDA data

Summary:

Thyroid function test abnormal is reported as a side effect among people who take Phentermine (phentermine hydrochloride), especially for people who are female, 50-59 old, have been taking the drug for 2 - 5 years also take Synthroid, and have Narcolepsy.

The phase IV clinical study analyzes which people have Thyroid function test abnormal when taking Phentermine. It is created by eHealthMe based on reports of 15,359 people who have side effects when taking Phentermine from the FDA, and is updated regularly.

What is Phentermine?

Phentermine has active ingredients of phentermine hydrochloride. It is often used in weight loss. eHealthMe is studying from 19,865 Phentermine users. Check the latest studies of Phentermine.

What is Thyroid function test abnormal?

Thyroid function test abnormal is found to be associated with 1,669 drugs and 1,587 conditions by eHealthMe. Check the latest studies of Thyroid function test abnormal.

On Dec, 05, 2025

15,359 people reported to have side effects when taking Phentermine.
Among them, 30 people (0.2%) have Thyroid function test abnormal.

Could Phentermine cause Thyroid function test abnormal?

Among these 30 people:

How long have people been on Phentermine when they have Thyroid function test abnormal? *

What is the gender of people who have Thyroid function test abnormal when taking Phentermine? *

female: 89.66 %
male: 10.34 %

What is the age of people who have Thyroid function test abnormal when taking Phentermine? *

What are other drugs people take besides Phentermine? *

What are other side effects people have besides Thyroid function test abnormal? *

Chest Pain: 8 people, 26.67%
Heart Palpitations (feelings or sensations that your heart is pounding or racing): 6 people, 20.00%
Infection: 5 people, 16.67%
Memory Loss: 5 people, 16.67%
Mitral Valve Incompetence (inefficient heart valve): 4 people, 13.33%
Constipation: 4 people, 13.33%
Weight Increased: 4 people, 13.33%
Urinary Tract Infection: 4 people, 13.33%
Type 2 Diabetes: 4 people, 13.33%
Appetite - Increased (increased appetite is when you want to eat much more often or in larger quantities than your body requires): 3 people, 10.00%

What are the existing conditions these people have? *

Sleep Disorder: 3 people, 10.00%
Neoplasm Malignant (cancer tumour): 3 people, 10.00%
Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 3 people, 10.00%
Growth Hormone Deficiency: 2 people, 6.67%
Chronic Thyroiditis (long lasting inflammation of thyroid gland): 2 people, 6.67%
Depression: 2 people, 6.67%
Diabetes: 2 people, 6.67%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 1 person, 3.33%
Cataplexy (loss of muscle tone accompanied by full conscious awareness): 1 person, 3.33%
Eating Disorder: 1 person, 3.33%

* Approximation only. Some reports may have incomplete information.

Do you take Phentermine and have Thyroid function test abnormal?

- Check whether Thyroid function test abnormal is associated with a drug or a condition
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Related studies:

Effectiveness of, long term effects of, and alternative drugs to Phentermine:

Phentermine (19,865 reports)

Browse all side effects of Phentermine:

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 Thyroid function test abnormal:

Thyroid function test abnormal (1,669 drugs)

Browse all the conditions that are associated with Thyroid function test abnormal:

Thyroid function test abnormal (1,587 conditions)

Drugs similar to Phentermine and Thyroid function test abnormal :

How the study uses the data?

The study uses data from the FDA. It is based on phentermine hydrochloride (the active ingredients of Phentermine) and Phentermine (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.