Methylcobalamin and Arrhythmias - a phase IV clinical study of FDA data

Summary:

Arrhythmias is reported as a side effect among people who take Methylcobalamin (vitamin b12), especially for people who are female, 60+ old, have been taking the drug for < 1 month also take Vitamin C, and have Ulcerative colitis.

The phase IV clinical study analyzes which people have Arrhythmias when taking Methylcobalamin. It is created by eHealthMe based on reports of 3,096 people who have side effects when taking Methylcobalamin from the FDA, and is updated regularly.

What is Methylcobalamin?

Methylcobalamin has active ingredients of vitamin b12. It is often used in vitamin b12 deficiency. eHealthMe is studying from 3,184 Methylcobalamin users. Check the latest studies of Methylcobalamin.

What is Arrhythmias?

Arrhythmias (irregular heartbeat) is found to be associated with 2,759 drugs and 4,837 conditions by eHealthMe. Check the latest studies of Arrhythmias.

On Jul, 11, 2026

3,096 people reported to have side effects when taking Methylcobalamin.
Among them, 35 people (1.13%) have Arrhythmias.

Could Methylcobalamin cause Arrhythmias?

Among these 35 people:

How long have people been on Methylcobalamin when they have Arrhythmias? *

What is the gender of people who have Arrhythmias when taking Methylcobalamin? *

female: 52 %
male: 48 %

What is the age of people who have Arrhythmias when taking Methylcobalamin? *

What are other drugs people take besides Methylcobalamin? *

What are other side effects people have besides Arrhythmias? *

High Blood Pressure: 14 people, 40.00%
Dyspnea (difficult or laboured breathing): 11 people, 31.43%
Visual Impairment: 9 people, 25.71%
Drug Level Increased: 9 people, 25.71%
Heart Palpitations (feelings or sensations that your heart is pounding or racing): 9 people, 25.71%
Feeling Abnormal: 9 people, 25.71%
Feeling Hot: 9 people, 25.71%
Itching: 8 people, 22.86%
Urinary Tract Infection Bacterial: 8 people, 22.86%
Back Pain: 7 people, 20.00%

What are the existing conditions these people have? *

Ulcerative Colitis (inflammatory bowel disease (ibd). it causes swelling, ulcerations, and loss of function of the large intestine): 9 people, 25.71%
Multiple Myeloma (cancer of the plasma cells): 8 people, 22.86%
Neuropathy Peripheral (surface nerve damage): 6 people, 17.14%
Hypokalemia (low potassium): 5 people, 14.29%
Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 4 people, 11.43%
Osteoporosis (bones weak and more likely to break): 4 people, 11.43%
Metastases To Bone Marrow (cancer spreads to bone marrow): 3 people, 8.57%
Constipation: 3 people, 8.57%
High Blood Pressure: 3 people, 8.57%
Hyperuricaemia (level of uric acid in the blood that is abnormally high): 3 people, 8.57%

* Approximation only. Some reports may have incomplete information.

Do you take Methylcobalamin and have Arrhythmias?

- Check whether Arrhythmias 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 Methylcobalamin:

Methylcobalamin (3,184 reports)

Arrhythmias treatments and more:

Arrhythmias (177,908 reports)

Browse all side effects of Methylcobalamin:

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 Arrhythmias:

Arrhythmias (2,759 drugs)

Browse all the conditions that are associated with Arrhythmias:

Arrhythmias (4,837 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on vitamin b12 (the active ingredients of Methylcobalamin) and Methylcobalamin (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.