Vitamin b1 and Nightmares - a phase IV clinical study of FDA data

Summary:

Nightmares is reported as a side effect among people who take Vitamin b1 (thiamine), especially for people who are female, 60+ old, also take Vitamin C, and have Hallucinations.

The phase IV clinical study analyzes which people have Nightmares when taking Vitamin b1. It is created by eHealthMe based on reports of 4,324 people who have side effects when taking Vitamin b1 from the FDA, and is updated regularly.

What is Vitamin b1?

Vitamin b1 has active ingredients of thiamine. It is often used in fatigue. eHealthMe is studying from 4,662 Vitamin b1 users. Check the latest studies of Vitamin b1.

What is Nightmares?

Nightmares (unpleasant dreams) is found to be associated with 1,320 drugs and 1,914 conditions by eHealthMe. Check the latest studies of Nightmares.

eHealthMe: drug outcomes in the real world

eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.

On Sep, 01, 2026

4,324 people reported to have side effects when taking Vitamin b1.
Among them, 11 people (0.25%) have Nightmares.

Among these 11 people:

What is the gender of people who have Nightmares when taking Vitamin b1? *

female: 63.64 %
male: 36.36 %

What is the age of people who have Nightmares when taking Vitamin b1? *

What are other drugs people take besides Vitamin b1? *

What are other side effects people have besides Nightmares? *

Insomnia (sleeplessness): 5 people, 45.45%
Confusional State: 5 people, 45.45%
Nausea (feeling of having an urge to vomit): 4 people, 36.36%
Dementia (madness): 4 people, 36.36%
Hallucinations (sensations that appear real but are created by your mind): 4 people, 36.36%
Constipation: 4 people, 36.36%
Arthritis (form of joint disorder that involves inflammation of one or more joints): 3 people, 27.27%
Memory Loss: 3 people, 27.27%
Weakness: 3 people, 27.27%
Hernia (hernia happens when part of an internal organ or tissue bulges through a weak area of muscle): 2 people, 18.18%

What are the existing conditions these people have? *

Delusion (a false belief or opinion): 4 people, 36.36%
Hallucinations (sensations that appear real but are created by your mind): 4 people, 36.36%
Parkinson's Disease: 2 people, 18.18%
Memory Loss: 2 people, 18.18%
Ischaemia (insufficient supply of blood to an organ, usually due to a blocked artery): 2 people, 18.18%
Insomnia (sleeplessness): 2 people, 18.18%
Stress And Anxiety: 2 people, 18.18%
High Blood Cholesterol: 2 people, 18.18%
Thyroid Diseases: 1 person, 9.09%
Hepatitis C: 1 person, 9.09%

* Approximation only. Some reports may have incomplete information.

Do you take Vitamin b1 and have Nightmares?

- Check whether Nightmares 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 b1:

Vitamin b1 (4,662 reports)

Nightmares treatments and more:

Nightmares (42,077 reports)

Browse all side effects of Vitamin b1:

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 Nightmares:

Nightmares (1,320 drugs)

Browse all the conditions that are associated with Nightmares:

Nightmares (1,914 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on thiamine (the active ingredients of Vitamin b1) and Vitamin b1 (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.