Relenza and Gastroenteritis - a phase IV clinical study of FDA data

Summary:

Gastroenteritis is reported as a side effect among people who take Relenza (zanamivir), especially for people who are female, 20-29 old, have been taking the drug for < 1 month also take Ilaris, and have Juvenile rheumatoid arthritis.

The phase IV clinical study analyzes which people have Gastroenteritis when taking Relenza. It is created by eHealthMe based on reports of 3,724 people who have side effects when taking Relenza from the FDA, and is updated regularly.

What is Relenza?

Relenza has active ingredients of zanamivir. It is often used in the flu. eHealthMe is studying from 3,738 Relenza users. Check the latest studies of Relenza.

What is Gastroenteritis?

Gastroenteritis (inflammation of stomach and intestine) is found to be associated with 1,346 drugs and 1,278 conditions by eHealthMe. Check the latest studies of Gastroenteritis.

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 Aug, 30, 2026

3,724 people reported to have side effects when taking Relenza.
Among them, 27 people (0.73%) have Gastroenteritis.

Among these 27 people:

How long have people been on Relenza when they have Gastroenteritis? *

What is the gender of people who have Gastroenteritis when taking Relenza? *

female: 59.26 %
male: 40.74 %

What is the age of people who have Gastroenteritis when taking Relenza? *

What are other drugs people take besides Relenza? *

What are other side effects people have besides Gastroenteritis? *

Diarrhea: 13 people, 48.15%
Thrombocytopenia (decrease of platelets in blood): 11 people, 40.74%
Juvenile Rheumatoid Arthritis (joint inflammation in children due to systemic disease): 11 people, 40.74%
Iron Deficiency Anaemia: 10 people, 37.04%
Bronchitis (inflammation of the mucous membrane in the bronchial tubes): 10 people, 37.04%
Infection: 10 people, 37.04%
Anogenital Warts: 10 people, 37.04%
Anaemia (lack of blood): 9 people, 33.33%
Purpura (purplish discoloration of the skin): 9 people, 33.33%
Synovial Cyst (cyst of joint filled with synovial fluid): 8 people, 29.63%

What are the existing conditions these people have? *

Juvenile Rheumatoid Arthritis (joint inflammation in children due to systemic disease): 13 people, 48.15%
Castleman's Disease (a disease of lymph nodes and related tissues): 4 people, 14.81%
Streptococcal Infection: 2 people, 7.41%
Dehydration (dryness resulting from the removal of water): 2 people, 7.41%
Nasopharyngitis (inflammation of the nasopharynx): 1 person, 3.70%
Inflammation: 1 person, 3.70%
Appetite - Decreased (decreased appetite occurs when you have a reduced desire to eat): 1 person, 3.70%

* Approximation only. Some reports may have incomplete information.

Do you take Relenza and have Gastroenteritis?

- Check whether Gastroenteritis 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 Relenza:

Relenza (3,738 reports)

Gastroenteritis treatments and more:

Gastroenteritis (21,518 reports)

Browse all side effects of Relenza:

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 Gastroenteritis:

Gastroenteritis (1,346 drugs)

Browse all the conditions that are associated with Gastroenteritis:

Gastroenteritis (1,278 conditions)

How the study uses the data?

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