Keflex and Thyroid diseases - a phase IV clinical study of FDA data


Thyroid diseases is found among people who take Keflex, especially for people who are female, 60+ old.

The phase IV clinical study analyzes which people take Keflex and have Thyroid diseases. It is created by eHealthMe based on reports of 13,107 people who have side effects when taking Keflex from the FDA, and is updated regularly. You can use the study as a second opinion to make health care decisions.

With medical big data and AI algorithms, eHealthMe enables everyone to run phase IV clinical trial to detect adverse drug outcomes and monitor effectiveness. Our original studies have been referenced on 600+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Most recently, phase IV clinial trails for COVID 19 vaccines have been added, check here.

On Jun, 30, 2022

13,107 people reported to have side effects when taking Keflex.
Among them, 18 people (0.14%) have Thyroid diseases.

What is Keflex?

Keflex has active ingredients of cephalexin. It is often used in infection. eHealthMe is studying from 14,007 Keflex users for its effectiveness, alternative drugs and more.

What is Thyroid diseases?

Thyroid diseases is found to be associated with 1,874 drugs and 1,400 conditions by eHealthMe.

Number of Keflex and Thyroid diseases reports submitted per year:

Could Keflex cause Thyroid diseases?

Gender of people who have Thyroid diseases when taking Keflex *:

  • female: 100 %
  • male: 0.0 %

Age of people who have Thyroid diseases when taking Keflex *:

  • 0-1: 0.0 %
  • 2-9: 0.0 %
  • 10-19: 0.0 %
  • 20-29: 0.0 %
  • 30-39: 0.0 %
  • 40-49: 9.09 %
  • 50-59: 18.18 %
  • 60+: 72.73 %

Common drugs people take besides Keflex *:

  1. Lasix: 6 people, 33.33%
  2. Wellbutrin: 6 people, 33.33%
  3. Neurontin: 5 people, 27.78%
  4. Cytomel: 5 people, 27.78%
  5. Synthroid: 5 people, 27.78%
  6. Crestor: 5 people, 27.78%
  7. Lyrica: 5 people, 27.78%
  8. Premarin: 5 people, 27.78%
  9. Vitamin E: 4 people, 22.22%
  10. Vivactil: 4 people, 22.22%

Common side effects people have besides Thyroid diseases *:

  1. Insomnia (sleeplessness): 12 people, 66.67%
  2. Constipation: 9 people, 50.00%
  3. Nausea (feeling of having an urge to vomit): 8 people, 44.44%
  4. High Blood Pressure: 7 people, 38.89%
  5. Weight Decreased: 7 people, 38.89%
  6. Appetite - Increased (increased appetite is when you want to eat much more often or in larger quantities than your body requires): 7 people, 38.89%
  7. Dizziness: 7 people, 38.89%
  8. Weight Increased: 6 people, 33.33%
  9. Fall: 6 people, 33.33%
  10. Nasopharyngitis (inflammation of the nasopharynx): 6 people, 33.33%

Common conditions people have *:

  1. Ovarian Cancer Stage Iv: 5 people, 27.78%
  2. Fallopian Tube Cancer (cancer of fallopian tube): 5 people, 27.78%
  3. Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 4 people, 22.22%
  4. Cataplexy (loss of muscle tone accompanied by full conscious awareness): 4 people, 22.22%
  5. Stress And Anxiety: 2 people, 11.11%
  6. Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 2 people, 11.11%
  7. Ovarian Cancer (cancer of ovary): 2 people, 11.11%
  8. Irritable Bowel Syndrome: 2 people, 11.11%
  9. Primary Myelofibrosis (primary disorder of the bone marrow): 1 person, 5.56%
  10. Myelodysplastic Syndrome (a group of conditions that occur when the blood-forming cells in the bone marrow are damaged): 1 person, 5.56%

* Approximation only. Some reports may have incomplete information.

Do you take Keflex and have Thyroid diseases?

Check whether Thyroid diseases is associated with a drug or a condition

How to use the study?

You can discuss the study with your doctor, to ensure that all drug risks and benefits are fully discussed and understood.

Related publications that referenced our studies

Related studies

Alternative drugs to, pros and cons of Keflex:

Thyroid diseases treatments and more:

COVID vaccines that are related to Thyroid diseases:

How severe was Thyroid diseases and when was it recovered:

Expand to all the drugs that have ingredients of cephalexin:

Common drugs associated with Thyroid diseases:

All the drugs that are associated with Thyroid diseases:

Common conditions associated with Thyroid diseases:

All the conditions that are associated with Thyroid diseases:

How the study uses the data?

The study uses data from the FDA. It is based on cephalexin (the active ingredients of Keflex) and Keflex (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.

Who is eHealthMe?

With medical big data and proven AI 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 600+ 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: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on 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.

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