Vitamin d and Narcolepsy - a phase IV clinical study of FDA data

Summary:

Narcolepsy is reported as a side effect among people who take Vitamin d (ergocalciferol), especially for people who are female, 60+ old, have been taking the drug for 2 - 5 years also take Xyrem, and have Cataplexy.

The phase IV clinical study analyzes which people have Narcolepsy when taking Vitamin d. It is created by eHealthMe based on reports of 282,675 people who have side effects when taking Vitamin d from the FDA, and is updated regularly.

What is Vitamin d?

Vitamin d has active ingredients of ergocalciferol. It is often used in low vitamin d. eHealthMe is studying from 294,094 Vitamin d users. Check the latest studies of Vitamin d.

What is Narcolepsy?

Narcolepsy (brain's inability to regulate sleep-wake cycles normally) is found to be associated with 431 drugs and 738 conditions by eHealthMe. Check the latest studies of Narcolepsy.

On Jul, 11, 2026

282,675 people reported to have side effects when taking Vitamin d.
Among them, 103 people (0.04%) have Narcolepsy.

Among these 103 people:

* Approximation only. Some reports may have incomplete information.

Do you take Vitamin d and have Narcolepsy?

- Check whether Narcolepsy 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 Vitamin d:

Vitamin d (294,094 reports)

Narcolepsy treatments and more:

Narcolepsy (79,888 reports)

How severe was Narcolepsy and when was it recovered:

Narcolepsy in Vitamin d

Expand to all the drugs that have ingredients of ergocalciferol:

Narcolepsy and drugs with ingredients of ergocalciferol (70 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 Vitamin d:

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 Narcolepsy:

Narcolepsy (431 drugs)

Browse all the conditions that are associated with Narcolepsy:

Narcolepsy (738 conditions)

Related publications that referenced our studies

Han SH, Lee SA, "Superficial Vein Thrombosis as the Initial Manifestation of Protein S Deficiency in an Adolescent with Narcolepsy", Sleep Medicine Research, 2016 Jun .
Kapoor S, "Influence of Vitamin D Consumption and Levels on the Development of Psychiatric Disorders", Lee, Y. J., & Park, K. (2018). Secondary Raynaud’s Phenomenon and Skin Necrosis of Toes in the Paraplegic Patient with Hypertension.?Drug safety-case reports,?5(1), 7., 2014 Aug .
Lopes E, Pereira D, da Silva Behrens NS, de Almeida Fonseca H, Calvancanti PO, de Araújo Lima TF, Pradella-Hallinan M, Castro J, Tufik S, Coelho FM, "Cataplexy as a side effect of modafinil in a patient without narcolepsy", Sleep Science, 2014 Mar .
Han SH, Lee SA, "Superficial Vein Thrombosis as the Initial Manifestation of Protein S Deficiency in an Adolescent with Narcolepsy", Sleep Medicine Research, 2016 Jun .
Kapoor S, "Influence of Vitamin D Consumption and Levels on the Development of Psychiatric Disorders", Lee, Y. J., & Park, K. (2018). Secondary Raynaud’s Phenomenon and Skin Necrosis of Toes in the Paraplegic Patient with Hypertension.?Drug safety-case reports,?5(1), 7., 2014 Aug .
Lopes E, Pereira D, da Silva Behrens NS, de Almeida Fonseca H, Calvancanti PO, de Araújo Lima TF, Pradella-Hallinan M, Castro J, Tufik S, Coelho FM, "Cataplexy as a side effect of modafinil in a patient without narcolepsy", Sleep Science, 2014 Mar .

How the study uses the data?

The study uses data from the FDA. It is based on ergocalciferol (the active ingredients of Vitamin d) and Vitamin d (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.