Selenium and Drowsiness - a phase IV clinical study of FDA data

Summary:

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

The phase IV clinical study analyzes which people have Drowsiness when taking Selenium. It is created by eHealthMe based on reports of 5,049 people who have side effects when taking Selenium from the FDA, and is updated regularly.

What is Selenium?

Selenium has active ingredients of selenium. It is often used in vitamin supplementation. eHealthMe is studying from 5,312 Selenium users. Check the latest studies of Selenium.

What is Drowsiness?

Drowsiness is found to be associated with 2,876 drugs and 4,756 conditions by eHealthMe. Check the latest studies of Drowsiness.

On Oct, 04, 2025

5,049 people reported to have side effects when taking Selenium.
Among them, 130 people (2.57%) have Drowsiness.

Among these 130 people:

How long have people been on Selenium when they have Drowsiness? *

What is the gender of people who have Drowsiness when taking Selenium? *

female: 63.56 %
male: 36.44 %

What is the age of people who have Drowsiness when taking Selenium? *

What are other drugs people take besides Selenium? *

What are other side effects people have besides Drowsiness? *

Fatigue (feeling of tiredness): 46 people, 35.38%
Nausea (feeling of having an urge to vomit): 41 people, 31.54%
Headache (pain in head): 38 people, 29.23%
Stress And Anxiety: 37 people, 28.46%
Depression: 28 people, 21.54%
Pain: 26 people, 20.00%
Back Pain: 25 people, 19.23%
Dizziness: 24 people, 18.46%
Fall: 24 people, 18.46%
Pain In Extremity: 23 people, 17.69%

What are the existing conditions these people have? *

Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 26 people, 20.00%
Pain: 21 people, 16.15%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 13 people, 10.00%
High Blood Pressure: 12 people, 9.23%
Stress And Anxiety: 12 people, 9.23%
Bone Density Abnormal: 11 people, 8.46%
Insomnia (sleeplessness): 9 people, 6.92%
Fibromyalgia (a long-term condition which causes pain all over the body): 9 people, 6.92%
Depression: 7 people, 5.38%
Cataplexy (loss of muscle tone accompanied by full conscious awareness): 7 people, 5.38%

* Approximation only. Some reports may have incomplete information.

Do you take Selenium and have Drowsiness?

- Check whether Drowsiness 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 Selenium:

Selenium (5,312 reports)

Drowsiness treatments and more:

Drowsiness (269,039 reports)

Browse all side effects of Selenium:

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

Common drugs associated with Drowsiness:

Browse all the drugs that are associated with Drowsiness:

Drowsiness (2,876 drugs)

Common conditions associated with Drowsiness:

Pain exacerbated: 12,747 reports
Pain relief: 12,587 reports
Depression: 11,548 reports
Antidepressant therapy: 11,506 reports
Multiple sclerosis aggravated: 9,554 reports
Hypertension: 9,266 reports
Htn: 9,215 reports
Acupuncture and pain: 6,871 reports
Anxiety: 6,828 reports
Feeling uptight: 6,819 reports

Browse all the conditions that are associated with Drowsiness:

Drowsiness (4,756 conditions)

Drugs similar to Selenium and Drowsiness :

How the study uses the data?

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