Flagyl and Vaginal bleeding between periods - a phase IV clinical study of FDA data

Summary:

Vaginal bleeding between periods is reported as a side effect among people who take Flagyl (metronidazole), especially for people who are 30-39 old, have been taking the drug for < 1 month also take Nuvaring, and have Birth control.

The phase IV clinical study analyzes which people have Vaginal bleeding between periods when taking Flagyl. It is created by eHealthMe based on reports of 24,739 people who have side effects when taking Flagyl from the FDA, and is updated regularly.

What is Flagyl?

Flagyl has active ingredients of metronidazole. It is often used in vaginitis bacterial. eHealthMe is studying from 25,897 Flagyl users. Check the latest studies of Flagyl.

What is Vaginal bleeding between periods?

Vaginal bleeding between periods is found to be associated with 573 drugs and 1,471 conditions by eHealthMe. Check the latest studies of Vaginal bleeding between periods.

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, 03, 2026

24,739 people reported to have side effects when taking Flagyl.
Among them, 20 people (0.08%) have Vaginal bleeding between periods.

Could Flagyl cause Vaginal bleeding between periods?

Among these 20 people:

How long have people been on Flagyl when they have Vaginal bleeding between periods? *

What is the age of people who have Vaginal bleeding between periods when taking Flagyl? *

What are other drugs people take besides Flagyl? *

What are other side effects people have besides Vaginal bleeding between periods? *

Abdominal Pain: 7 people, 35.00%
Back Pain: 5 people, 25.00%
Nausea (feeling of having an urge to vomit): 5 people, 25.00%
Pain: 5 people, 25.00%
Stress And Anxiety: 4 people, 20.00%
Nausea And Vomiting: 4 people, 20.00%
Abdominal Pain Upper: 4 people, 20.00%
Deep Venous Thrombosis (blood clot in a major vein that usually develops in the legs and/or pelvis): 3 people, 15.00%
Dizziness: 3 people, 15.00%
Mental Disorder (a psychological term for a mental or behavioural pattern or anomaly that causes distress or disability): 3 people, 15.00%

What are the existing conditions these people have? *

Birth Control: 8 people, 40.00%
Pain: 5 people, 25.00%
Premenstrual Syndrome: 4 people, 20.00%
Acne (skin problems that cause pimples): 3 people, 15.00%
Abdominal Pain: 2 people, 10.00%
Hypogammaglobulinaemia (an abnormally low concentration of gamma globulin in the blood and increased risk of infection): 2 people, 10.00%
Stress And Anxiety: 2 people, 10.00%
Hyperkalemia (damage to or disease of the kidney): 2 people, 10.00%
Allergic Rhinitis: 2 people, 10.00%
Anaemia (lack of blood): 2 people, 10.00%

* Approximation only. Some reports may have incomplete information.

Do you take Flagyl and have Vaginal bleeding between periods?

- Check whether Vaginal bleeding between periods 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 Flagyl:

Flagyl (25,897 reports)

Browse all side effects of Flagyl:

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 Vaginal bleeding between periods:

Vaginal bleeding between periods (573 drugs)

Browse all the conditions that are associated with Vaginal bleeding between periods:

Vaginal bleeding between periods (1,471 conditions)

How the study uses the data?

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